309 



that of Icris though lacking the stout hairs on the outer side of this 

 arm in that species and having the hairs on the inner side more dis- 

 tinct. The female differs from fusinervis principally in venation, 

 the first vein being distinctly short of the middle of third, and entirely 

 separate from it except where it is connected by the cross vein. The 

 color of the female is also slightly different from that of fusinervis, 

 the abdomen in pcrcgrinus being generally brown. 



Length, 1-1.25 mm. 



Illinois localities : Urbana. Mahomet, Monticello, Muncie, St. Jos- 

 eph, Sumner, Dubois, and Algonquin. Dates of capture range from 

 April 24 to November 7. 



Originally described from New York State. I have seen examples 

 from Ithaca, New York, submitted by Professor Johannsen, and from 

 South Haven and Grand Junction, Michigan, collected by Mr. Hart. 



I have little doubt as to the correctness of the identification, though 

 the species may have been described by Coquillett under another name 

 with which description I have failed to associate the species. 



PsEUDOCULicoiDES, n. gen. 



This genus is especially distinguished from Culicuides by the ab- 

 sence of thoracic cavities and by the structure of the antennae of the 

 male, the last four joints being elongated and, except the apical joint, 

 binodose, each node having a distinct whorl of long hairs, the apical 

 joint simple, swollen, and having a single whorl of hairs. The an- 

 tennae of the female are very much like those of Culicoides, but the 

 apical joint is more swollen and the hairs are longer, the tarsi have dis- 

 tinguishable empodia, and the surface of the wings is covered with 

 coarse decumbent hairs instead of the fine upright hairs present in 

 Culicoides. 



Type species, Pscudocidicoidcs niutabilis Cociuilletc. 



Key to Species 



1. Small species, at most 1.5 mm. in length 2 



— Larger species, 1.75 mm. in length 3 



2. Mesonotum velvety black with more or less distinct whitish pruinose 



markings 1. mutahilis. 



— Mesonotum black, entirely covered with dense brownish pniines- 



eenee 2. cinctus. 



3. Inferior process of hypopygium short (PI. XXI, Fig. 9) 



3 major. 



— Inferior process of hypopygium long (PI. XXI, Fig. 10) 



4. joliannseni. 



