of the two specimens before me. I have both sexes of undularis, not differing perceptibly; but of umbripennis I find I have only females. ZANCLOGNATHA LÆVIGATA, Grote. A large series shows immense variation in color. The most extreme ? variety has the median space ochreous, the basal and terminal fields blackish; this form is very striking. The species may be known by the irregular subterminal line. The reniform is sometimes open; again solid and black; the orbicular is sometimes visible near the t. a. line. Sometimes the median space is bronzed and dark; again the whole wing is concolorous purply-brown; the median shade is sometimes present and again obsolete. The species is common at light and at sugar near Buffalo, N. Y., in June and July. ZANCLOGNATHA MINIMALIS, n. sp. 9.-Half the size of cruralis or lævigata. Of the same dusty ochrey color, varying in depth (one very dark). Fore tibia of the male with the usual brush of pale and dark hair. Smoothly scaled; subterminal line straight, inconspicuous, more or less margined with pale externally, running from costa to internal margin. T. p. line much as in cruralis, a little drawn in submedially, irregular, accented on costa, Discal spot solid; t. a. line thrice waved. Hind wings paler, powdered with fuscous. A mesial line bent and most distinct at anal angle. On both wings, a terminal interrupted line. Beneath paler, with discal dots and distinct mesial line more or less plainly crenulated; subterminal line absent or indistinct. Expansion, 21 to 25 millimetres. Maine (Mr. Charles Fish); New York. This species is the smallest known to me. I have examined four specimens. DERCETIS, n. g. The fore wings are deeply excavate to vein 4, so that there is a resemblance to Aventia. The palpi are disproportionally long stretched straight out, the short, third joint vertical; the elongate second joint as in Hypena. Ocelli; eyes naked, unlashed. Legs unarmed, untufted. Male antennæ very shortly pectinate, setose. Fore wings deeply excavate to vein 4; external margin produced at the middle about veins 4 and 3, thence sloping inwardly to internal angle; 12-veined, vein 1 simple, 2 from submedian at basal, 3 shortly before 4, 5 on a line with 4 from a cross-vein very near 4 at base, cell open, 6.opposite 5 from a cross-vein, 7 and then 8 out of 9, 10 within 6 from the upper side of the vein about midway between 11 and 7. Hind wings rounded, a slight depression opposite the cell; 8-veined, two internal veins counted as 1, 3 and 4 from one point, 5 from a short cross-vein within 3 and 4, cell open. The moth is light purplish-gray; beneath, the abdomen and wings are stained with ochrey and brown. It looks like one of the Pyralidæ, but from its structure I refer it to the Deltoids. DERCETIS VITREA, n. sp. -Fore wings light purplish-gray, a little tinged with ochrey on costa before exterior line. A white discal spot; interior line marked on costa. Exterior line tolerably distinct, lunulate, marked on costa, as is the faint subterminal line. Fore wings darker outwardly, with a more purplish cast. Hind wings grayish-white, crossed by two outer lines; a broken terminal line. Beneath, costal region of primaries ochrey, terminally shaded with brown; the wings are irrorate with brown and ochrey darker than above, lines repeated and the white discal spot on primaries; hind wings with faint dark discal mark. Expansion, 25 milmetres. Several specimens, Buffalo, N. Y., in July. DERCETIS PYGMÆ▲, n. sp. 9. Of the same color as the preceding, but less than half the size. The reniform is reddish-ochreous, not white. Inner line faint, oblique, rounded. The angles of the primaries are less pronounced and the palpi less prominent. The insect is very inconspicuous, faded dustygray, with obliterate ornamentation. Expansion, 14 millimetres. Texas (Belfrage, No. 395, July 1). MAMESTRA CONGERMANA. Hadena congermana, Morrison, Can. Ent. vi. 106. I have before me Mr. Morrison's type, and the eyes are distinctly hairy. I cannot see why Mr. Morrison referred the moth to Hadena. He says of it (l. c.):-"It is another member of the same little closely related group of Hadena, of which dubitans Walk., and sputator Grote, are the only species." This is totally inaccurate, the species being nearest to Mamestra vindemialis. Its resemblance to dubitans and sputator is not greater than that of vindemialis Grote, which latter may be the vindemialis of Guenée, and the rubefacta of Mr. Morrison. ART. VII-A SYNOPSIS OF THE NORTH AMERICAN SPECIES OF THE GENUS ALPHEUS. BY J. S. KINGSLEY. The materials upon which the following paper is based are the collections of the Peabody Academy of Science at Salem, Mass., and of the Peabody Museum of Yale College at New Haven, Conn., which latter were kindly loaned the writer by Prof. S. I. Smith. ASTACUS (pars), Fabricius, Entomologiæ Systematicæ, 1793, ii. 478. PALEMON (pars), Oliver, Encyclopédie Méthodique, 1811, v. 656. ALPHEUS, Fabricius, Suppl. Ent. Syst. 1798, 404.-Latreille, Genera Crustacés et Insectorum, 1806, i. 52; id. Considérations Générales sur . . . les Crustacés, etc. 1810, 101.-Say, Journal Academy Natural Sciences, Philadelphia, 1818, i. 243.Bosc, Hist. Nat. des Crustacés, 2e éd. par Desmarest, 1830, ii. 72.—Gray, in Griffith's Cuvier, Crustacea, 1832, 192.-H. Milne-Edwards, Hist. Naturelle des Crustacés, 1837, ii. 349.—Dana, U. S. Exploring Expedition, Crustacea, 1852, i. 534, 541.-Bell, British Stalk-eyed Crustacea, 1853, 270. BETEUS, Dana, op. cit. i. 534, 548.--Stimpson, Proceedings Acad. Nat. Sciences, Phila. delphia, 1860, 31. The genus Alpheus, as limited by the writer, is characterized by baving a compressed form, the carapax being extended forward, forming a hood over the eyes, the rostrum either small or wanting; the antennula with a two-branched flagellum; antennæ with a large antennal scale. Mandible deeply bifurcate, the anterior brauch being oblong, slender; a mandibular palpus present; external maxillipeds are slender, of moderate length; hands of the first pair generally greatly enlarged, unequal, sometimes the right and sometimes the left being the larger in the same species. The second pair are slender, filiform, chelate, the carpus multiarticulate. The remaining feet and the abdomen present no characters of especial importance. In 1852, Dana characterized the genus Betaus, which differs from Alpheus, as accepted by him, merely in the absence of a rostrum and the inversion of the hands, the dactylus being borne on the lower edge of the propodus. That the line separating these two genera cannot be drawn is shown by the fact that Betaus trispinosus Stm. is rostrated, while in a large series of Alpheus minus Say I found many which wanted the rostrum. The hand also cannot be taken as a guide, for we find forms of Alpheus heterochelis, in which the dactylus is a little inclined; in my Alpheus cylindricus, it works still more obliquely, while in my Alpheus transverso-dactylus its motion is in a horizontal plane. Thus the species of Betaus described by Dana (truncatus, æquimanus, scabrodigitus), Stimpson (australis and trispinosus), and Lockington (longidacty lus and equimanus) will have to be placed in the genus Alpheus. Say, in volume 1 of the Journal of the Academy of Natural Sciences, was the first to mention any North American species of this genus, describing Alpheus heterochelis and A. minus. Milne-Edwards, in his "Histoire Naturelle des Crustacés", t. ii, describes as new A. armillatus from the West Indies, and also gives abstracts of Say's descriptions. DeKay, in the "New York Fauna, Crustacea ", also gives brief diagnoses of the same two species. Gibbes, in the "Proceedings of the American Association for the Advancement of Sciences", vol. iii, reports A. heterochelis and A. minus from Florida and Charleston, S. C. He also proposes as new A. formosus. Heuri de Saussure, in his "Mémoire sur Divers Crus tacés Nouveaux du Mexique et des Antilles", redescribes A. heterochelis under the specific name lutarius. He also refers to a previous article (Revue Zoologique, 1857, 99, 100), where, laboring under a misapprehen sion, he described it as the type of a new genus, Halopsyche. Dr. Stimp son, in a critique of this memoir of Saussure (American Journal of Science, 1859, xxvii. 446), pronounces his lutarius to be the heterochelis of Say. S. I. Smith ("Transactions of the Connecticut Academy of Arts and Sciences", ii. 39) reports A. heterochelis from various localities. Dr. Streets, in the "Proceedings of the Academy of Natural Sciences of Phil adelphia", 1871, 242, describes A. bispinosus from the Isthmus of Panama, but from which coast I am unable to ascertain. Mr. Lockington, in the "Proceedings of the California Academy of Sciences", February 7, 1876, describes Alpheus bellimanus, A. equidactylus, and Betaus longidactylus, this being the first mention of any species from the Pacific coast. In a later paper (March 20, 1876), he adds Betaus equimanus and Alpheus clamator. This comprises, so far as I am aware, all the literature of the North American Alphei. ALPHEUS MINUS Say. Alpheus minus Say, Jour. Acad. Nat. Sci. 1818, i. 245.-Edwards, Hist. Nat. des Alpheus formosus Gibbes?, loc. cit. 196. Carapax smooth; rostrum short, acute; a spine arising from the anterior edge of the hood over each eye equalling the rostrum in length, thus giving the front a three-spined appearance. Basal spine of antennulæ slender, acute, incurved, reaching to the middle of the second basal joint; first joint as long as second and third, second a half longer than the third; flagella ciliated, two-thirds the length of the carapax. Basal spine of antennæ long, slender. Antennal scale regularly ellip tical, extending slightly beyond the antennular peduncle; flagellum nearly twice as long as the carapax. External maxillipeds slender, extending beyond the peduncle of the antennulæ. Feet of the first pair greatly unequal; larger hand a third longer then carapax, cylindrical, |