AMERICAN HYMENOPTEEA. 369 



11. Fascise on base and middle of segment 2, on middle of 3. and apical margin 



of 4 14- 



Fascise obsolete, or nearly ; at least the front and middle legs and under parts 

 black ; head, thorax above and base of abdomen ochraceous 12. 



12. Scopa black; tegulse testaceous; often oblique fasciae on sides of segment 3 



and sometimes apical patches on each side of 4, white ; wings blackish ; 

 vein Ill-t usually with a stump at the bend ; lp. 18:8; 17-19 mm. 



a tripes. 

 Scopa ochraceous; wings more hyaline ; tegulse black 13. 



13. Pubescence above short, dense, pale, of occiput black; abdomen black; lp. 



19:10; 13-14 mm. cnici. 



Pubescence above long and more fulvous, of occiput the same; vertex in front 

 more or less black ; sides of segment 2 often, and of 3 sometimes, with 

 narrow oblique fasciae; lp. 12:6; 13-15 mm.; sp^nov. ; 49 specimens 



autuiiiualis. 



14. Fascia on segment 4 not enclosing a diamond-shaped black patch; vertex 



without black hairs, except sometimes a few on the sides 16. 



Fascia on segment 4 enclosing a diamond-shaped black patch ; tegulse testa- 

 ceous; pubescence of thorax above ochraceous, beneath black or fus- 

 cous ; fascia on 2 narrow, hardly arcuate 15. 



15. Hind metatarsi fulvous within; thorax beneath fuscous; vertex usually" 



without black hairs ; wings more hyaline ; lp. 14 : 6 ; 10-13 mm. 



petalostemouis. 



Hind metatarsi black within ; thorax beneath black ; vertex usually with 



black hairs in front; wings somewhat clouded; lp. 14:7; 13-14 mm. 



comptoides. 



16. Pubescence pale, blackish on tarsi and labium ; wings nearly hyaline; tegu- 



lae and uervures blackish ; fasciae rather broad and white, that on 



segment 4 entire; 15 mm. pallida. 



Pubescence fulvous 17. 



17. Fasciae broad, nearly covering segments 2-4, that on 4 entire; uervures pale; 



hind tarsi posteriorly fulvous; tegulse pieeous ; nip. usually 4; lp. 



14 : 8 ; 11-12 mm. agilis. 



Fascise narrow, that on segment 4 notched or interrupted by black poste- 

 teriorly ; nervures darker ; tegulse testaceous ; pubescence of legs, 

 labrum, abdomen beneath and hind tarsi posteriorly usually darker ; 

 mp. usually 3; lp. 12:6; 11-13 mm. trinodis. 



Males. 



Segment 7 with lateral spines 3. 



Segment 7 without lateral spines; joint 3 nearly one-half as long as 4; clypeus, 

 labrum and base of mandibles yellow; vertex without black hairs; 

 tegulse testaceous; at least the base of segment 2 with narrow fascia- 1. 

 1. Pubescence of hind legs black ; segment 3 with oblique white fascise on each 

 side; wings clouded; mesonotum and scutel without black pubes- 

 cence ; 16-1S mm. atripes. 



Pubescence of hind legs not black ; segments 2-6 fasciate ; wings not clouded ; 

 mesonotum and scutel usually with black or fuscous hairs 2. 



TRANS. AM. ENT. SOC. XXXI. (47) OCTOBER, 1905. 



