Eurymus eurytheme Boisd. sp.-St. George, April-May; Juniper Mountains, May 1-2 or June 4; Beaver Mountains, July 18-20.

Nathalis iole Boisd.-Juniper Mountains, June 4; Mount Trumbull, June 7-10; Beaver Mountains, July 18-20.

Synchloe thoosa, nov. sp.—Allied to S. cethura (Anth. cethura Feld.), but differing from it in many details. On the upper surface of the front wings, the orange spot is deeper in tint and narrower, partly because of the greater breadth of the transverse costal bar at the tip of the cell. Beyond the orange patch, the wing is dark brown, the border continuing over the whole outer margin, although narrowing rapidly below; within this broad, brown border are longitudinal, white dashes, slightly largest inwardly, extending to the margin only on the lower half of the wing, where, in the interspaces, the brown fringe is interrupted with white. The disk of the hind wing is suffused with citron, and next the tip of all the nervules is a faint sprinkling of black dots, more noticeable on the outer than the inner half of the wing. Beneath, the orange spot of the front wings is nearly as conspicuous as above, and the space occupied above by the brown border is heavily sprinkled with grayish, slightly greenish-brown scales, largely interrupted in the interspaces with long white wedges pushing inward from the margin. On the hind wings, the greenish-yellow of S. cethura is replaced by the same grayish-brown found at the apex of the front wings, and is arranged in a pattern closely resembling that of S. cethura, but with noticeably narrower white spaces. Expanse, 35 millimetres.

A single female was taken at Mokiak Pass, April 28-30 or June 2.

Pieris oleracea (Harr.) Boisd.-To this species I refer for the present a single small, immaculate butterfly taken on the Beaver Mountains, July 18-20, reserving some remarks upon it for a future paper.

Pontia protodice Boisd. sp.—St. George, April-May; Juniper Mountains, May 1-2 or June 4; Bear Valley, July 4; Paragoorah, July 10-12.

Jasoniades daunus Boisd. sp.-Juniper Mountains, June 4; Paragoonah, July 10-12.

Epargyreus tityrus (Fabr.) Scudd.-Mount Trumbull, June 7-10.

Thorybes pylades Scudd.-Mount Trumbull, June 7-10; Beaver Mountains, July 18-20.

Thanaos propertius Scudd.-Burg. sp.-This species has been hitherto known from California only. It was taken by Dr. Palmer at Mokiak Pass, April 28-30; Juniper Mountains, May 1-2; and Mountain Meadows, May 14-18..

Thanaos, nov. sp.-The description of this species will be given with others at a future time. Only a single female was taken (Mount TrumBull. iv. No. 1-17

bull, June 7-10); but I have before received the same form from the same general region.

Hesperia comus Edw.-Juniper Mountains, June 4; Mount Trumbull, June 7-10.

Hesperia tessellata Scudd.-St. George, April-May; Mokiak Pass, April 28-30 or June 2; Mount Trumbull, June 7-10; Bear Valley, July 4; Beaver Mountains, July 18-20.

Heliopetes ericetorum (Boisd.) Scudd.-Mokiak Pass, April 28-30 or June 2; Mount Trumbull, June 7-10.

Pholisora catullus (Fabr.) Scudd.-St. George, April-May; Pine Mountains, May 12.

Heteropterus libya, nov. sp.-This species is placed provisionally in the genus Heteropterus, of which Pap. morpheus Pall. is the type, but differs from it to such an extent that it must undoubtedly be eventually separated therefrom.

The wings are uniform dark glossy brown above, with a tinge of dark green; the fringe concolorous, excepting on the upper half or more of the fore wings, where it is albescent. Midway between the tip of the fore wing and the apex of the cell is a conspicuous, though not large, slightly oblique, white cross-band, interrupted by the nervules occupying the three lower subcostal interspaces, while there is an inconspicuous white spot in the centre of the middle median interspace. Beneath, the front wings are paler than above, with the markings repeated, sometimes (in male only ?) with less distinctness, and with a hoary clouding at the apex of the wing. Hind wings of the same ground-color, but with such a sprinkling of olivaceous scales as to give a decided greenish hue; the inner margin as far as the submedian vein almost entirely or quite white; a transverse band of squarish, snow white spots of median size cross the wing, represented particularly by equal spots in the subcosto-median and medio-submedian interspaces; midway between the former and the base is a smaller, circular, snow-white spot, and occa sionally a few white scales midway between them in the costo-subcostal interspace, which may properly be considered part of the median series; in addition, there is a series of submarginal, vaguely defined, roundish or lunular white spots in the interspaces.

The palpi are white beneath, dark brown above; and this, together with the shape of the wings, gives it a certain resemblence to Pholisora catullus. Antennæ white beneath, dark brown above, narrowly annulated with white at the base of the joints of the stalk; the club purplish-black. Expanse of wings, 32mm; length of antennæ, 7mm. 18,29. Beaver Dam, April 20–28.

Ochlodes sonora Scudd.-Beaver Mountains, July 18-20. This species has not been hitherto reported east of the Sierra Nevada. By what we presume must be a clerical error, Mr. W. H. Edwards, in his recent catalogue, places this as a synonym to Boisduval's Hesp. sylvanoides.

ART. XI.-NOTES ON THE HERPETOLOGY OF DAKOTA

AND MONTANA.

BY DRS. ELLIOTT COUES AND H. C. YARROW.

The present article is based primarily upon a collection of Reptiles and Batrachians made in Dakota and Montana in 1873-74 by Dr. Coues, as Naturalist of the United States Northern Boundary Commission.

In identifying these specimens, the authors have diligently compared them with other material from the same geographical area in the National Museum, and have added to the species collected by Dr. Coues others known to occur in the region under consideration, thus presenting a tolerably complete list of the Reptiles and Batrachians of the two Territories. No species is introduced that is not fully identified and determined to inhabit this portion of the United States. Care has been taken with the synonymy to exclude doubtful references, except in one or two instances. The descriptions are drawn directly from the specimens, and considerable matter of popular interest has been introduced. The nomenclature and classification are mainly according to Professor Cope's recent Check List, though the authors have not hesi tated to differ from this authority on occasion.

A.-REPTILIA.

CHELONIA.

Family EMYDIDÆ.

Genus CHRYSEMYS. Gray.

CHRYSEMYS OREGONENSIS. (Harlan) Ag.

Oregon Golden Turtle.

Emys oregonensis, HARL. Am. Journ. Sci. xxxi. 382, pl. 31.-HOLBR. N. Am. Herpet. i. -, 107, pl. 16.-DEKAY, N. Y. Fn. iii. 1842, 20.

Chrysemys oregonensis, AG. Contr. Nat. Hist. U. S. i. 1857, 440, pl. 3, f. 1-3.-BD. U. S. Mex. B. Surv. ii. pt. ii. 1859, Reptiles, 4 (Texas).—ALLEN, Proc. Bost. Soc. N. H. xvii. 1874, 68 (Fort Rice, Dakota).

Specimen.

1096. Mouse River, Dakota. Aug. 30, 1873.

Shield Reptiles are not well represented in the region surveyed by

the commission, where the present, the only one observed, appears to be the most characteristic species. Professor Agassiz notices specimeus from different localities in Minnesota and from the Yellowstone, where it was also observed by the Prince Maximilian and Mr. J. A. Allen. The former naturalist expresses great doubes respecting the accuracy of Nuttall's statement that it is found in Oregon, as it has never been seen in that Territory by any of the recent explorers, the only true Turtle of the Pacific slopes being the Chelopus marmoratus Bd. & Grd. (Emys nigra of Hallowell). It is, however, a species of wide distribution in the central region, having been observed southward nearly to the Mexican border in Texas.

The following additional species of this order are indicated by authors as occurring on or near the northern boundary:

Genus PSEUDEMYS. Gray.

PSEUDEMYS ELEGANS. (Maxim.)

Elegant Terrapin.

Emys elegans, MAXIM. Reise Nord-Amer. i. 1839, 213 (Upper Missouri).—HAYD. Trans. Am. Phil. Soc. xii. 1862, 177 (Yellowstone).

Trachemys elegans, AGASS. Contrib. Nat. Hist. U. S. i. 1857, 435.-BD. U. S. Mex. B. Surv. ii. pt. ii. 1859, Reptiles, 3 (Texas.)

Pseudemys elegans, GRAY.-COPE, Check List Bat. Rept. N. A. 1875, 53.

Emys cumberlandensis, HOLBR. N. Am. Herpet. i. 115, pl. 118 (Tennessee).—DEKAY, N.
Y. Fauna, iii. 1842, 20.

Emys holbrookii, GRAY, Cat. Brit. Mus. 1844, 23.
Emys terrapin, WAILES, Geol. Rep. Mississippi, 1854, p.

(fide Agass.).

A species originally described from the Upper Missouri by Prinz Maximilian von Neu Wied, and subsequently ascertained to occur throughout the Central region, east to the Ohio, and south to Texas.

Cistudo ornata, AGASSIZ, Contrib. Nat. Hist. U. S. i. 1857, 445, pl. 3, f. 12, 13.—COPE, Check List Bat. and Rep. N. A. 1875, 53.

The Northwestern type of Cistudo, Professor Agassiz remarked, in proposing C. ornata, is of all the forms the most likely to be distinct, and such has proven to be the case. "It is round, broad, and flat, without keel, even when young, while the young of Cistudo virginea are always strongly keeled." The species is based upon specimens from the Upper Missouri and from Iowa.

1

Trionyx spiniferus, LE SUEUR, Mém. Mus. d'Hist. Nat. xv. 258, pl. 6.

Aspidonectes spinifer, Agass. Contrib. Nat. Hist. U. S. i. 1857, 403.-COPE, Check List N. A. Bat. and Rep. 1875, 51.

Trionyx ocellatus, LE SUEUR (young O̟, fide Agass.; not of DeKay, which is Amyda mutica).

Trionyx ferox, partim, ALIQ.

The Northern and Northwestern Aspidonectes, the characters and synonymy of which were first satisfactorily distinguished from those of the Southern A. ferox by Professor Agassiz in the work above cited, is represented as a common species from New York and Pennsylvania to the Rocky Mountains, where it is mentioned as occurring by Lewis and Clarke. According to Say and Allen, it is frequently found in the tributaries of the Missouri; the last-named naturalist took it in the Musselshell and Yellowstone. (See ALLEN, Proc. Bost. Soc. Nat. Hist. 1874, p. 69.)

Testudo serpentina, LINN. Syst. Nat. ed. 12, i. 1766, 354 (localities erroneously assigned as Algiers and China). Also of other older authors.-LEC. Ann. Lyc. Nat. Hist. N. Y. iii. 127.

Chelonura serpentina, SAY, Journ. Acad. Nat. Sci. Phila. iv. 217.-HOLBR. N. Am. Herpet. 1st ed. iv. 21, pl. 3; 2d ed. i. 139, pl. 23.—DEKAY, N. Y. Fn. iii. 1842, 8, pl. 3, f. 6.

Emys serpentina, GRAY, Syn. Rept. in Griffith's An. Kingd. ix. 14.

Chelydra serpentina, HARL. Med. & Phys. Res. 1835, 157.-AGASS. Contrib. Nat. Hist. U. S. i. 1857, 417. And of most late authors.-COPE, Check List N. A. Bat. and Rep. 1875, 51.

Emysaurus serpentina, DUMÉR. & BIBR. Erp. Gén. ii. 350.—STORER, Rep. Mass.

212.

Chelydra emarginata, AGASS. op. cit. in text.

"Chelydra lacertina, SCHW." (young). "Testudo serrata, PENN."

"Testudo longicauda, SHAW."

A species of remarkably extended distribution, from the Northern border of the United States to South America; not, however, in the Pacific region.