G. C. DAVIS. 315 



palpi and tarsi (somewhat yellow on basal segment), reddish brown ; apical half 

 of anterior femora, anterior tibiaj, middle tibiae, except apical fifth, apical half 

 of hind tibiai, basal half of third abdominal segment and all of the second ex- 

 cept a large, irregular black patch above, lemon-yellow; antennae reddish brown, 

 black at base ; wings yellowish hyaline, nervures and stigma black, yellowish at 

 base; median and subniedian cells equal on externo-median vein; head and 

 thorax opaque, abdomen subpolished : metanotum with longitudinal carina, the 

 median ones uniting at base ; abdomen smooth, petiole gradually vyidening ; ab- 

 domen arched and subcompressed at apex. 



One specimen from Franconia, N. H. (Mrs. Slosson) ; coll. Davis. 



Jflesoleptiis pictus n. sp. 



9 . — 8 mm. Black, with apex of petiole, segments 2 and 3, except apex, cly- 

 peus, mouth-parts, trochanters, four anterior legs except coxse. basal two-thirds 

 of tibiae and tarsi, reddish yellow; antennae fulvous, dusky at base; wings yel- 

 lowish subhyaliue, nervures and stigma pale; median and subniedian cells on 

 externo-median nervure equal : clypeus prominently elevated ; head and thorax 

 opaque; abdomen subpolished, smooth, petiole gradually widening ; metathorax 

 with longitudinal carinse the median ones approximate, nearly parallel, approach- 

 ing on apical dorsum. 



%i . — Diflers in having the face, scape beneath, spots on anterior lateral margin 

 of mesonotum. tegulae, spot in front, another beneath, post-scutellum, tips of the 

 four anterior coxte and fourth abdominal segment lemon-yellow, or with a reddish 

 shade. 



Three specimens from Canada, Colorado and New Hampshire 

 (types, coll. Amer. Ent. Soc. and Davis). 



IfIeNOle|>tU!« Isetiis Cress. (3£esole,ius), Proc. Acad. Nat. Sc. Phil. 1878, 372. 



'J, . — 10 mm. Black, with face, mouth-parts, scape beneath, pectus, spots on 

 anterior lateral margin of mesonotum, tegulse, spot before, another beneath^ 

 abdomen except two apical segments, four anterior legs and of posterior legs, 

 ti'ochanters, tarsi and tibiae, except apex, lemon-yellow; antennae reddish brown, 

 blackish at base; wings yellowish, subhyaline; nervures and stigma pale; me- 

 dian and submedian cells on externo-median nervure equal; body shagreened, 

 subpolished ; abdomen shining, smooth ; petiole gradually widened, moderately 

 broad at base; longitudinal carinae on metathorax. 



Two specimens from Vancouver, Canada (coll. Am. Ent. Soc). 



In the four preceding species the apical segment of the hind tarsi 

 is curved, but not as long as the third. 



iHesoleptus ripariiis n. sp. 



% 9- — 8 mm. Ferruginous, with head, prothorax, sternum, lower half of 

 mesopleura, broad transverse band acros's metathorax and coxae, femora and apex 

 of tibiae of postei-ior legs, black or reddish black : face, mouth-parts and trochan- 

 ters, lemon-yellow ; remainder of legs and scutellum brownish yellow; antennae 

 slender, brownish red, darker at base ; wings fusco-hyaline, nervures dark, stigma 

 yellow; metathorax flat, indistinctly carinate ; abdomen depressed, clavatc, sub- 

 compressed at apex; ovipositor short, straight, strong; petiole smooth, strongly 

 but evenly broadened toward apex : the whole body is shagreened and subopaque ; 

 legs slender, hind tarsi distinctly longer than their tibiae. 



TRANS. .\M. ENT. SOC. XXIV. . NOVEMBER, 1897. 



