260 BULLETIN: MUSEUM OF COMPAKATIVE ZOOLOGY. 



Trichiosomites obliviosus, sp. nov. 



Length 9 mm. Body broad and stout, the width of the abdomen being 3 mm. 

 Color apparently black, with more or less brownish on the abdomen. Wings 

 hyaline, the veins dark. Head rounded on the sides, its surface finely shagreened ; 

 mesonotum more coarsely so or finely punctulate. Scutellum smooth. Metano- 

 tum more or less rugose. All of the abdominal segments are of nearly equal 

 length, the fifth widest, one and one-half times as wide as the first. Abdomen 

 in outline regularly oval. Marginal cell in front wings very long and narrow, 

 pointed, but not at all appendiculate, divided by a cross-vein at its basal third. 



Fig. 1. — Trichiosomites obliviosus Brues. Fore-wing. 



Humeral area divided by a cross-vein near the origin of the basal vein; sub- 

 median cell longer than the median by one-third the length of the transverse 

 median nervure. Basal vein and first recurrent nervure almost parallel. First 

 and second submarginal cells not separated, the second recurrent nervure intersti- 

 tial with the second transverse cubitus. Anal cell as in Pachyprotasis, divided 

 into two by the fusion of the anterior and posterior nervures ; the petiole thus 

 formed as long as the distance from the fusion to the transverse median nervure. 



Type. — No. 2036, Mus. Comp. Zool., Florissant, Col. (No. 1381, S. H. 

 Scudder Coll.). 



Phenacoperga Cockerell. 



The type species and only one so far made known is P. coloradensis Ckll., from 

 Florissant. It was first described in the genus Perga (Cockerell, : 07 a ), but later 

 made the type of Phenacoperga by its author ( :08). 



Lophyrus Latreille. 



Brischke ('86) records the occurrence of Lophyrus in Prussian amber, but the 

 genus has not been found fossil elsewhere. 



Hemichroa Stephens. 



A single species, H. eophila Ckll., has been described from Florissant by Pro- 

 fessor Cockerell ( : 06), who refers it to this genus without any doubt. There are 

 no specimens in the collections which I have seen. 



