308 



Johannsen) and Little Bear Lake at Grand Junction, Mich. (C. A. 

 Hart). 



The commonest species of the genus according to my experience. 



Early stages undescribed and adult habits unknown. 



3. Ceratopogon fusinervis, n. sp. 



Male. — Black, shining. Head entirely black; antennal plumes 

 blackish brown. Mesonotum with slight brownish pruinescence. Ab- 

 domen less distinctly pruinescent than mesontum; apical half of lat- 

 eral arms of hypopygium yellowish. Legs brownish yellow, mid and 

 hind coxse and the knees darkened. Wings clear, veins brown. Hal- 

 teres brownish, the knobs white. Bristles on body black. 



Eyes contiguous ; antenn?e rather stout, subequal in length to head 

 and thorax together, apical four joints elongated, short joints of fla- 

 gellum somewhat cup-shaped; antepenultimate joint of palpi not as 

 long as apical two joints together and hardly thicker than ultimate 

 joint. Mesonotum without distinct hairs except on posterior half, 

 lateral view of anterior half as in Figure 6, Plate XXHI ; scutellum 

 with four marginal bristles. Hypopygium as in Figure 20, Plate XXL 

 Legs rather stout ; basal joint of hind tarsi a little more than twice as 

 long as second; claws small, simple, eciual. Third vein ends at two 

 thirds the wing-length, first almost fused with third, reaching to middle 

 of latter; petiole of media very short; cubitus forking below end of 

 first vein. 



Female. — Similar to male in coloration. 



Eyes separated by a very narrow line ; antennse rather thick, apical 

 five joints elongated, entire length of antenna equal to head and thorax 

 combined. Thorax and abdomen more robust than in the male, the 

 hairs on the former more distinct. Legs similar to those of the male. 

 Wings broader, venation similar to that of the male. 



Length, 1-1.5 mm. 



Type locality, Grand Tower, 111., April 21, 1914, on bank of Mis- 

 sissippi River (C. A. Hart and J. R. Malloch). Paratypes taken by 

 the same collectors at St. Joseph, May 3, Urbana, May 20, Havana, 

 May 2, Dubois, April 24, and Monticello, June 28, all in 19 14. 



4. Ceratopogon peregrinus Johannsen 



Ceratopogon peregrinus Johanngen, Bull. 124, N. Y. State Museum, 1908, p. 266. 



Very similar to fiisinerzis, but differing from it in the male in 

 structure of antennae and in form of hypopygium, the apical portion of 

 the lateral arm of the latter being much shorter and stouter, resembling 



