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



13. Hind femur ferruginous, its apex a little infuscate . . 2. similis (Cresson) 

 Hind femur entirely or mostly black or fuscous 14 



14. Hairs on temple about 0.5 as long as third segment of maxillary palpus. 



12. albicaligata (Walsh) 



Hairs on temple about 0.33 as long as third segment of maxillary 



palpus 15 



15. Flagellum with a median white band. 



la. montivaga tnontivaga (Provancher) 

 Flagellum without a median white band 16 



16. Apical tergites ferruginous ... lb. montivaga austrina, new subspecies 

 Apical tergites black 3. nigripes, new species 



17. Wings rather strongly infuscate; punctures on cheek separated by about 0.5 



their diameter 16. depilis, new species 



Wings weakly infuscate to subhyaline; punctures on cheek often crowded . 18 



18. Second segment of flagellum about 2.6 as long as wide. 



8. semirubra Townes 

 Second segment of flagellum about 3.6 or 3.75 as long as wide 19 



19. Clypeus about 0.65 as wide as face; flagellum with a median white band; 



apical part of flagellum often pale brown .... 5. apicalis, new species 



Clypeus about 0.8 as wide as face; flagellum without a median white band, 



but sometimes one or two of the median segments whitish above; apical 



part of flagellum always blackish 9. latidens, new species 



1. Trychosis montivaga (Provancher) 



Figure 382 



Front wing 5.0 to 8.5 mm. long; clypeus moderately wide, less 

 convex than usual for the genus, its apical margin wealdy arcuate or 

 almost truncate, the margin sometimes with a faint median prom- 

 inence; temple moderately convex; cheek rather short, with moderately 

 small, sharp punctures that are separated by about then- diameter; 

 occipital carina strong and sharp but not raised as a lamella; second 

 flagellar segment of male about 2.2 as long as wide, of female about 

 4.3 as long as wide; thorax rather short; notauli usually more or less 

 distinct for about 0.25 the length of mesoscutum; punctures on meso- 

 pleurum separated by about 0.7 their diameter; propodeum rather 

 short, in the female its apical carina broadly interrupted medially, 

 the tv/o lateral sections strong and sharp, rather gently sinuate and 

 forming rudimentary sublateral crests; hind femur of male about 5.5 

 as long as deep, of female about 5.2 as long as deep; areolet usually 

 rather wide; ncrvulus beyond basal vein by about 0.45 its length; 

 nervellus broken near or below the middle; petiole with indistinct 

 rounded dorsolateral and ventrolateral ridges, in the female almost 

 terete, its lateral face with a tendency toward weak vertical wrinkling, 

 especially in male ; second tergite weakly mat, its hair sockets separated 

 by about 0.8 the length of the hairs; ovipositor normal for the genus. 



There are two subspecies, differentiated on color as below : 



1. Apex of abdomen black (very rarely ferruginous); middle basitarsus of male 

 white, its extreme base sometimes pale fulvous; flagellum of female with an 



