314 AMERICAN HYMENOPTERA. 



Segment 1 black, 2 and 3 lemon-yellow with black markings. 



nigralis n. sp. 



Trochanters, clypens. and face in % yellow. 



Petiole, except tip, black ; post-sciitelliim in % rufous. 



diiiitiiicliis n. sp. 

 Petiole and four anterior coxse yellow, scutellums black. . .lietiiK Cress. 



Thorax ferruginous riparius n. sp. 



Posterior femora pale. 



Antennae with white annulus; thorax mostly rufous • . • -albifroiis Cress. 

 Antennje not annulate with white. 



Abdominal segments black with apical margins more or less white. 



Petiole long, slender; sternum and scutellums white. . . .deceits Cress. 

 Petiole short, broad : small species; sternum of 9 honey-yellow, scutel- 



lum of % with two white stripes zebratus n. sp. 



Abdomen more or less rufous. 

 Thorax mostly or entirely black. 

 Submedian cell longer than the median on externo-median nervure. 

 Posterior tibise and abdomen rufous at apex ; hind coxse black. 



iii!«idiosu»« Cress. 

 Posterior tibiae, and abdomen blackish at apex ; hind coxae rufous. 



intimatiis n. sp. 

 Submedian cell slightly shorter than median on externo-median ner^ 

 vure; mesonotum rufous; scutellum yellow. 



nigropleuralis n. sp. 



Thorax and abdomen entirely rufous innoxiiiN Cress. 



Clypeus elevated without distinct margin at apex or transverse impression before 

 the apex. 



Posterior femora and abdomen black egregius n. sp. 



Posterior femora rufous. 

 Petiole of abdomen black. 



Abdomen black, except on segment .3, which is yellow. . .^triatus n. sp. 

 Abdomen rufous tipped with black, face above clypeus black. 



torpens n. sp. 

 Petiole of abdomen and coxae rufous. 



Scutellum and thorax black SCi'iipiilONiis n. sp. 



Scutellum. and often part of thorax, rufous rtifigaNter Prov. 



Ilesoleplus tardus Prov. (Tryphon), Faune, Ent. Can. ii, 417. 



9 (and % Prov.). — 9 mm. Black, with the three basal segments of the abdo- 

 men yellowish ferruginous ; aiatennae fulvous, blackish at base ; legs yellow, with 

 coxae, trochanters, posterior femora and tibiae at apex, black ; clypeus, except at 

 base, and mouth-parts reddish yellow; wings yellowish subhyaline ; nervures 

 and stigma light brown ; submedian cell distinctly longer on externo-median 

 nervure than median cell; metanotum with longitudinal carinae : mesonotum 

 without parapsidal grooves; abdomen suhpolished, smooth above, petiole gradu- 

 ally broadened; head and thorax opaque, clypeus scarcely elevated. 



Two specimens from Canada and Mt. Washington, New Hamp- 

 shire (Mrs. Slosson ). 



Mesoleptiis iiigralis n. sp. 



9 . — 10 mm. Black, with apical half of clypeus. central portion of mandibles. 



