OSBORN AND BALL REVIEW N. A. SPECIES OF IDIOCERUS. 135 



Idiocerus amcemus V. D. 



Idiocerus atncemns Van Duzee. Can. Ent., XXVI., p. 89, 1894 ; Cat., 

 p. 261. 



Greenish, elytra hyaline, pronotum and scutellum olive or fulvous 

 brown. Length, ? 5 mm.; J^. 4.5 mm.; width, 1.5 mm. 



Face shorter than in suturalis, genae decidedly convex, reaching the 

 tip of the clypeus. Clypeus widest at apex, the side margins straight. 

 Face unicolorous, yellowish green in the female, two brown stripes 

 below in the male. Pronotum olive brown, washed with fulvous, 

 often marked with lighter. Elytra hyaline, allowing the dark fterv- 

 ures and the green tergum to be seen, outer anteapical cell moderately 

 long. Ultimate ventral segment of the female short, feebly rounded 

 behind, the outer angles obsolete. Male antennal disc moderately 

 large, nearly round. 



Occurs on willows. So far specimens have only been received 

 from Colorado and California. 



Idiocerus pallidus Fitch, 



Idiocerus pallidus Fitch. Homop., N. Y. State Cab., p. 59, 185 1. 

 Bythoscopus pallidus Walker. Homo})., IV., p. 1162. 



Idiocerus ufticolor Osborn. Proc. Iowa Acad, Sci., I., pt. II., p. \2, 1892. 

 Idiocerus obsoletus Walker. Homop., III., p. 873, 185 1. 



Large, pale greenish, eyes reddish. Length, 9 6 5 mm.; c?, 6 

 mm.; width, 2 mm. 



Face and all beneath pale greenish; eyes reddish browji; prono- 

 tum greenish; scutellum greenish; rarely with dark markings on the 

 angles. Elytra greenish, sub-hyaline, nervures indistinct, occasionally 

 the elytra are hyaline showing the dark nervures of the under wing. 



Tergum greenish, rarely in dark specimens blackish, a very broad, 

 stout species. The outer anteapical cell long, triangular, rarely want- 

 ing. Ultimate ventral segment of female short, posterior margin 

 medially produced into a broad, rounding lobe; pygofers scarcely 

 inflated, exceeded by the stout ovipositor, by the length of the ventral 

 segment; male antennal discs oblong, moderately large. 



This is a wide-spread and abundant species occurring on willows. 

 Specimens are at hand from New York, Iowa and Colorado, and it 



