517 



apical, the lengths of the joints from base to apex being respectively 

 as lo, 15, 20, T,S. In other respects closely resembles the male. 



Length, 2.5-3 mni- 



Illinois locality, Momence, July 17, 19 14, at light (C. A. Hart). 



Originally described from a male taken at Washington, D. C. Re- 

 corded from New Jersey. I have seen examples taken on Plummer's 

 Island, Md.. and at Washington, D. C, in August and October (W. 

 L. McAtee). 



Earlv stages unknown. 



't>' 



4. TRiCHocr.ADius iNFuscATus, n. sp. 



Male. — Head yellow ; antennae fuscous, scape glossy black, plumes 

 fuscous ; palpi brownish. Thorax glossy black, pronotum, lateral mar- 

 gins of mesonotum, the spaces between the vittcC, and a small portion 

 of upper part of mesopleura yellowish; scutellum brown; postnotum 

 black. Abdomen black, venter and apices of the last two or three dor- 

 sal segments greenish. Legs fuscous, fore coxae, trochanters, and 

 base of all femora, mid and hind tibicC and bases of their tarsi green- 

 ish yellow ; fore tibiae and tarsi almost unicolorous fuscous. Wings 

 clear, veins pale brown. Halteres yellow. 



Frontal tubercles absent; antenna about one and a third times as 

 long as head and thorax combined. Pronotum of moderate breadth. 

 Hypopygium as in Figure 7, Plate 'XXXVII. Legs slender; fore tarsi 

 without long hairs, basal joint almost three fifths as long as fore tibiae 

 (21 : 36) ; hairs on mid and hind legs barely longer than diameter of 

 the joints which bear them. Third vein ending at about the same dis- 

 tance in front of wing-apex as upper branch of cubitus does behind it 

 (PI. XXXIX, Fig. 2) ; cross vein distinctly but not greatly in front 

 of middle of wing; cubitus forking very slightly beyond cross vein. 



Length, 3.25 mm. 



Type locality, Peoria, 111., October 22, 19 14, at light (C. A. Hart). 



Early stages unknown. 



Closely allied to Ortlwcladius fiigax Johannsen, but separable by 

 the color of the hypopygium, which is whitish in fugax, and several 

 structural characters. Probably this is var. a of Johannsen, recorded 

 from Ithaca, N. Y., and from "Chicago. 



5. Trichocladius striatus, n. sp. 



Male. — Differs from infuscatus in being paler in color, the face, 

 ground color of thorax, bases of femora, and the tibiae being yellow. 



Structurally it resembles infuscatus closely, differing principally 

 in the form of the hypopygium as shown in Figure 10, Plate XXXVII, 



