440 



21. Chironomus nigrohalteraus, n. sp. 



Male. — Black. Head black, antennal plumes fuscous. Thorax 

 black, the disc glossy, with very slight pruinescence. Membranous 

 area on pleurae brownish. Abdomen entirely black, shining. Legs 

 black, tibije and basal two or three tarsal joints, except their apices, 

 yellowish brown. Wings clear, veins yellow, black at base of wing. 

 Halteres black. Hairs of body blackish brown, those on legs paler. 



Pronotum distinct nearly to upper margin of mesonotum, the latter 

 with few hairs on disc. Hypopygium as in Figure lo, Plate XXXHI. 

 Fore tarsi without long hairs, basal joint about a fifth longer than fore 

 tibiae (24: 20) ; hairs on mid and hind legs inconspicuous. Third vein 

 ends noticeably before wing-tip, similar to that of pseudoziridis (PI. 

 XXXIX, Fig. I ) ; cubitus forks appreciably beyond cross vein. 



Female. — Agrees in color with the male, except that the wings are 

 slightly grayish. 



Length, 1.75-2.25 mm. 



Type locality, Havana, 111., April 28, 1914 (C. A. Hart and J. R. 

 Mallodi). 



The early stages are unknown. 



22. Chironomus sub^^qualis, n. sp. 



Male. — Black, shining. Head black ; antennae with the flagellum 

 and plumes fuscous. Thorax glossy black, without traces of prui- 

 nescence. Abdomen subshining black, segments without traces of pru- 

 inescence. Legs black, tibiae and bases of tarsi fuscous. Wings 

 slightly grayish, veins brown. Halteres white. 



Pronotum linear, not extending to upper margin of mesonotum, 

 which protrudes considerably anteriorly ; disc of mesonotum with a 

 few weak black hairs. Abdomen slender; penultimate and antepenulti- 

 mate segments slightly broadened, the last segment narrowed ; hypo- 

 pygium as in Figure 15, Plate XXXIII. Legs slender; fore tarsi with- 

 out long hairs, basal joint very slightly longer than tibia (27:25). 

 Third vein ends at beginning of curve at apex of wing; the first ends 

 before middle of third; second, distinctly separated from first, ending 

 midway between apex of first and apex of third ; cross vein at middle 

 of wing; cubitus forking appreciably beyond cross vein. 



Female. — Differs from the male in having the legs stronger and 

 the basal joint of fore tarsi almost the same length as the fore tibiae. 



Length, 2-2.5 """"i- 



Type localitv, Muncie, 111., May 24, 1914 (C. A. Hart and J. R. 

 Malloch). 



