515 



6. Femora entirely yellow ; posterior half of fifth and sixth dorsal ab- 



dominal segments yellow, the remainder velvety black 



6. distinctus. 



— Femora blackened on bases 7 



7. Abdomen of male black, that of female with narrow pale posterior 



margins to segments . distinctus, var. hasalis. 



— Abdomen of male whitish or yellowish, blackened at apex 



distinctus, var. hicolor. 



I. Trichocladius nitidus, n. sp. 



Male. — Black. Head glossy black, scape of antennje concolorous, 

 flagellum, plumes, and palpi fuscous. Thorax entirely black and highly 

 polished ; scutellum velvety black. Abdomen velvety black with slight 

 indication of pale posterior margins to apical three segments. Legs 

 black, tibiae and tarsi brownish black. Wings clear, veins at base black- 

 ened, first and third brown, the others pale. Halteres black. Hairs on 

 body and legs brown. 



Pronotum narrow. Hypopygium as in Figure 7, Plate XL. Legs 

 slender; fore tarsi without long hairs, basal joint three fifths as long 

 as tibia ; hairs on mid and hind tibise not mucli longer than the diameter 

 of the tibise. Third vein ends distinctly but not greatly in front of 

 wing-apex ; distance from cross vein to apex of first slightly less than 

 distance from the latter to apex of third ; cubitus forks almost directly 

 below cross vein, its posterior branch almost straight (PI. XXXIX, 

 Fig. 14). 



Length, 2 mm. 



Type locality, Monticello, 111., June 28, 19 14 (C. A. Hart and J. R. 

 Malloch). 



Early stages unknown. 



2. Trichocladius nitideIvLus, n. sp. 



Male. — Glossy black. Head, including the antennae and their 

 plumes, black, clypeus yellowish. Pronotum and upper central portion 

 of pleurae brownish, remainder of thorax glossy black; disc of meso- 

 notum wathout pruinescence. Abdomen entirely shining black. Legs 

 tawny yellow, femora and apices of tarsi brownish. Wings clear, 

 veins almost colorless except at base. Halteres brown. 



Apical joint of antenna about twice as long as the other flagellar 

 joints combined. Hypopygium similar to that of Camptocladius fla- 

 vens, the apex of apical portion of lateral arm with a rather slender 

 thorn situated in a rounded hollow. Legs moderately stout ; fore tarsi 

 without long hairs, basal joint slightly more than half as long as fore 



