368 U. S. NATIONAL MUSEUM BULLETIN 2 1 6 part 3 



This species occurs in the United States and southern Canada, mostly 

 east of 100° west longitude. 



16. Trychosis depilis, new species 



Figure 396 



Front wing 4.8 to 7.5 mm. long; clypeus rather small, strongly 

 convex, its lower half rather abruptly declivous to the apical margin, 

 the apical margin rather strongly arcuate; cheek long, its punctures 

 moderately coarse, separated by about 0.5 their diameter; temple 

 weakly convex, rather long; occipital carina strong, sharp, and rather 

 high, near hypostomal carina sometimes raised as a lamella that may 

 be as high as the width of thu*d segment of maxillary palpus; second 

 segment of flagellum about 2.4 as long as wide in male, about 2.75 as 

 long as wide in female; horizontal portion of epomia moderately 

 strong but its vertical portion incomplete or very weak, present only 

 above; punctures of mesopleurum moderately coarse, strong, separated 

 by about 0.4 their diameter; propodeum of moderate length, its apical 

 carina forming weak sublateral crests, mesad of the crests slanted 

 forward, the median portion of apical carina usually absent; hind 

 femur about 5.2 as long as deep in male, about 4.8 as long as deep in 

 female; intercubiti weakly convergent; nervulus beyond basal vein 

 by about 0.25 its length; nervellus broken near its middle; petiole 

 moderately slender, usually with weak to moderately strong ventro- 

 lateral and dorsolateral longitudinal ridges, its lateral face usually 

 with weak, irregular wrinkles in male, smooth or almost smooth in 

 female; second tergite polished, the hairs on its median portion mod- 

 erately dense to sparse in male, sparse to very sparse in female; ovi- 

 positor normal for the genus. 



Male: Black. Palpi brown; tegula black; second trochanters fer- 

 ruginous to black; front and middle legs beyond trochanters ferru- 

 ginous, their femora often more or less fuscous basally and behind, 

 their fifth tarsal segments dark brown; hind femur ferruginous or 

 sometimes more or less infuscate; hind tibia varying from ferruginous 

 with its apex infuscate to entirely fuscous; hind tarsus brown, ferru- 

 ginous brown at the joints; wings moderately infuscate; abdomen 

 ferruginous, the basal 0.7 ± of its first segment black and its apex 

 fuscous or infuscate, the infuscation beginning variously beyond the 

 fifth, sixth, or seventh tergites. 



Female: Colored like the male except that coxae and trochanters 

 often have a ferruginous tinge and rarely are mostly ferruginous, 

 wings average a little darker, first abdominal segment is entirely 

 ferruginous except often for some basal infuscation, and apex of 

 abdomen is not blackish except for sometimes a little infuscation on 

 last one or two tergites. 



