474 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



with rnfous, a little black at tip; the ventral segment at base of ovi- 

 positor eraargiuated in the middle, the side-pieces valvular, arcuated. 



Length to tip of ovipositor 4-4^ millimeters; to tip of abdomen 3-3^ 

 millimeters. Width of pronotum 1 fall 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 

 were 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 soiled- 

 yellow, with the black markings distinct, and the ovipositor reddish- 

 ocherous. 



Several other species of Jassince were collected at Colorado Springs, 

 Denver, and Manitou, but they are too much changed to admit of accu- 

 rate 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 boih 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. 



Typhlocyba Germ. 



T. aureo-viridis, new sp. 



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 yellow- 

 ish 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; antennae long, pale 

 green at base, fuscous beyond. Pronotum 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, nar- 

 row, and almost straight, the two outer ones triangular, and the one 

 next OKtside of the middle obtriaugnlar. Wings hyaline, highly irides- 

 cent, and with a bright golden tinge. Ovipositor projecting beyond 

 the long valvular genital segment. 



Length to tip of ovipositor 3-4 millimeters; to tip of hemelytra 5-5^ 

 millimeters. W^idth of pronotum 1^- millimeters. 



This brightest of our green Typhlocybas was found in large numbers 

 at Denver and in Clear Creek Caiion, upon the leaves of willows 

 August 7 to 18. 



