108 



PRELIMINARY LIST 



Hinpoasca aureo-viridis Uhl. 



In large numbers at Denver and in Clear Creek Canon, on willows, August 

 7th to 18th (Uhler, 5). Colorado (VanDuzee, 4). 



J^mpoasca clypeata n. sp. 



Male: Clypeus one-half longer than broad, basal suture straight; lorae as in T. 

 sanguinea: genae very narrow, attaining the clypeus as a very narrow line, lateral 

 margins nearly straight; front nearly twice as long as its greatest width between the 

 eyes, twice the length of the clypeus, superior angle very broad and obtusely rounded. 

 Face and vertex finely shagreened. Disc of 

 vertex flat, sloping, scarcely longer on the 

 middle than next the eye. Pronotum slightly 

 wrinkled on posterior two-thirds, glabrous in 

 front, sliglitly more than twice as broad as long, 

 anterior margin broadly rounded, posterior 

 margin concave, posterior angles sharply 

 rounded, sides long. Scutellum normal, trans- 

 verse suture straight. Color yellowish; in light 



specimens, face, vertex, pronotum, and scutellum yellowish, concolorous; in dark speci- 

 mens front with a median white line, pronotum dusky on posterior half, scutellum with 

 basal angles and transverse groove dark; elytra in light specimens yellowish subhyaline, 

 in dark specimens shaded into deep smoky subhyaline; venter and legs entirely pale 

 yellow, sometimes tibiae and tarsi slightly smoky. 



Length 4.5 mm. Described from six males. 



Estes Park, July 10th (Gillette) 

 lOtli on willow (Baker). 



Steamboat Springs, July 



JSmpoasca nigra n. sp. 



Male: Clypeus about one-half longer than broad, basal suture straight: lorae as in 

 T. sanguinea; genae suddenly broadening close to eye, lateral margin almost straight, 

 attaining the clypeus in a very narrow line; front nearly one-half longer than broad, 



once and two-thirds the length of clypeus, superior angle 

 broadly obtusely rounded. Face coarsely and obsoletely 

 shagreened. Disc of vertex sloping, with a slight median 

 depression on the posterior half opening into a slight de- 

 pression on the anterior margin of the pronotum, length 

 at the middle slightly more than next the eyes. Prono- 

 tum opaque, on anterior third smooth, on posterior two-thirds indistinctly transversely 

 rugose; slightly less than twice as broad as long, anterior margin broadly rounded, 

 posterior margin somewhat concave, posterior angles sharply rounded. Scutellum 

 opaque, with a median pit just in front of the transverse groove, posterior half irregularly 

 ■wrinkled. Color black; antennae whitish; ocelli surrounded by a narrow pale margin; 

 elytra black, posterior third fading into smoky subhyaline; anterior tibiae, and all the 

 tarsi, smoky. 



Length 3.75 to 3 mm. Described from five males. 



Mountains south-west of North Park, July 10th, On Arte- 

 misia tridentata (Baker) . 



^mpoasca nigroscuta n. sp. 



Female: Clypeus minutely transversely rugose, one- 

 half longer than wide, basal suture straight, apex rather 

 pointed; lorae two-thirds as long, and one-halfas wide as 

 clypeus, distant from tip of clypeus; genae narrow, a deep 

 sunken furrow beneath the eyes extending to the lorae, 

 not attaining tip of clypeus, outer margin nearly straight, 

 very narrow below lorae; front smooth, nearly twice longer 



