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Abundant upon low herbage in damp fields at Denver, and near Sloan's Lake, west of Denver, August 17. One specimen has the hemelytra dusky yellow and without markings.

7. J. lcetus.

Jassus lætus Uhler, Bull. C. S. Geol. Surv., vol. ii, No. 5, p. 94.
One specimen from the mountains near Beaver Brook, August 6.

PLATYJETOPIUS Burm.

P. acutus.

Jassus acutus Say, Journ. Acad. Phila., vi, 306, No. 2. One specimen from near Manitou, August 13, swept from herbage near the Fountain Creek. It is very common in the Atlantic region, being found from Boston, Jass., as far as to the Saint John's River, Florida. A single specimen is in a bottle of my specimens from Utah, near Salt Lake.

DELTOCEPHALUS Burm.

D. argenteolus, new sp).

Form very similar to that of Athysanus stylatus Bob.; hemelytra very short, truucated, not reaching beyond the second abdominal segment; color bluish-green, silvered. Teaci short-conical, green, the vertex indented just behind the tip, the basal surface a little depressed ; face paler, the front showing traces of faint, transverse lines; antennæ dusky, paler at base. Pronotum bluish-green, highly polished, short, much arcuated anteriorly, minutely transversely wrinkled; the lateral margins oblique, a little thickeneil ; the deflexed sides depressed, bluish-white, crossed by two slender, black lines. Legs yellowish-green; coxæ a little clouded with black; femora faintly streaked with black on one or both faces, the outer face of the middle pair also twice banded with blackish ; tibiie usually a little streaked with blackish, but the posterior pair has a strong blackish line on the inner face. Sternum and pleural pieces black, the latter more or less margined with yellow, superiorly with a broad, pale vittà. Scutellum minutely rugulose, uniform bluish-green. Hemelytra short, almost truncated, bluish-green, tinged with silvery, coarsely punctate in oblique series, the nervures indistinct and the apical cells obliterated. Tergum elegant bluish-green, highly silvered, black at base; the penultimate segment margined on the sides posteriorly and on the posterior margin, the base of the last segment, and a transverse line of dots on each segment (on the last segment with only two dots) black; venter green, black on the base and along the disk as far as the ovipositor, a blackish dot on the center of each segment of the connexivum; sides of anal valves whitish-green, a little clouded or streaked with fuscous; the ovipositor and its sheath produced very much beyond the end of the abdomen, ocherous-tinged

were

with rufous, a little black at tip; the veutral segment at base of ovipositor emarginated in the middle, the side-pieces valvular, arcuated. .

Length to tip of ovipositor 4-41 millimeters; to tip of abdomen 3-3. millimeters. Width of pronot um 1 full millimeter.

One female has the hemelytra fully developed, reaching to the end of the abdomen, with the nervures moderately straight and the cells long ; the posterior edges of the segments on the tergum black. No males

seen or captured. Quite common upon willows at Colorado Springs and near Manitou.

The above description was taken from the fresh specimens. Shortly after death, the clear colors are lost, and then the insect appears soiledyellow, with the black markings distinct, and the ovipositor reddishocherous.

Several other species of Jassince were collected at Colorado Springs, Denver, and Manitou, but they are too much changed to admit of accurate definition. Descriptions of them can readily be given hereafter when fresh specimens are procured. Work in this field of research is liable to be mixed with error unless the specimens are obtained in full series of both sexes, the colors noted when the insects are alive, and then carefully preserved, all of which demands much time, as well as skill and attention.

TYPILOCYBA Germ.

T. aureo-viridis, new s]).

Long and slender, vivid yellowish-green, the hemelytra translucent, exquisite golden-green, faintly blackish on the apical margin. Head broad, hardly tumid, sublunate, wider than the pronotum, rich yellowish-green on the vertex and front; the latter with a pale stripe down the middle, and a short one on the inner margin next the eye; cheeks deeper green ; eyes narrow, as seen from above; antennæ long, pale green at base, fuscous beyond. Prouotum smooth, yellowish green, moderately long, arcuated in front, and a little convex; each side and middle just behind the head with a pale round spot; lateral margins hardly reflexed, slightly prominent, a little obliquely arcuated. Beneath and legs green, the nails and pulvilli black. Scutellum with a broad, paler green line along the middle. Hemelytra narrow, yellowish-green, golden; the apex with four cells, of which the middle one is long, narrow, and almost straight, the two outer ones triangular, and the one next ontside of the middle obtriangular. Wings hyaline, highly iridescent, and with a bright golden tiuge. Ovipositor projecting beyond the long valvular genital segment.

Length to tip of ovipositor 3-4 millimeters; to tip of hemelytra 5-51 millimeters. Width of pronotum 14 millimeters.

This brightest of our green Typhlocybas was found in large numbers at Denver and in Clear Creek Cañon, upon the leaves of Willows August 7 to 18.

PSYLLIDÆ. Several species were swept from plants and bushes in the vicinity of Colorado Springs; but they have been too much altered in appearance to admit of description.

APHIDÆ.

Aphis, and other genera closely allied, were common upon many kinds of plants and bushes wherever I went in Colorado. The specimens, however, are too much shriveled and changed to admit of correct description.

(To be continued.] 19 HB

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