G. C. DAVIS. 317 



scutelluras, tegulse, spot in front, lines beneath and back, hoolted line on lateral 

 margin of mesouotuni, pectus, sternum and four anterior legs, lemon-yellow, 

 antennae fulvous; hind coxse above, and petiole black; wings hyaline, irides- 

 cent, nervures and stigma brown ; submedian cell considerably longer on ex- 

 terno-median nervure than median cell; second recurrent uniting far back of 

 transverse cubital ; carinfe on metathorax faint; abdomen depressed, moderately 

 broad: petiole rather slender, gradually broadened toward apex and with slight 

 median depressions. 



One specimen, Massachusetts (coll. Amer. Ent. Soc.j. 



Mesoleptti!^ iiitiiiiatiis n. sp. 



% . — 6 mm. Black, with face, mouth-parts, cheeks beneath, scutellums, tegulfe, 

 spot in front, another beneath, pectus, four anterior legs, hind trochanters and 

 base of hind tibiae, yellow; posterior coxae and femora rufous; tarsi and apical 

 half of tibiae in hind legs, dusky ; abdomen black, with segments 2-4 more or 

 less rufous; antennae reddish brown; wings subhyaline, nervures and stigma 

 light brown ; submedian cell slightly longer than the median on externo-median 

 nervure; mesonotum broad with parapsldal grooves indicated ; metathorax with 

 faint carinae ; abdomen of equal width ; petiole broad, scarcely widening toward 

 apex, smooth except slight groove near the base. 



Two specimens, Montana and Colorado (Prof. Gillette) ; coll. 

 Amer. Ent. Soc. and Davis. 



Mesolcptus iiigropleuralis n. sp. 



% . — 10 mm. Black, with vertex, mesonotum, abdomen and hind femora and 

 coxae dark honey-yellow; face, scape, mouth-parts, tegulae, spot in front, line 

 beneath, triangular spots on margin of mesonotum, scutellum, spots on pectus 

 and anterior mesosternum. four anterior legs, hind trochanters, most of tibiae and 

 tarsi, yellow; apex of hind tibiae dusky; antennae dark reddish brown, darker 

 toward base; wings yellowish subhyaline, nervures and stigma yellowish brown; 

 metathorax with two median areolets, carinae distinct; abd'omen long, moderately 

 broad; petiole broad, gradually widening toward apex. 



One specimen from Nevada (coll. Amer. Ent. Soc. ). 



Alesoleptiis iunoxiU!« Cress., Proc. Acad. Nat. Sci. Phila. 1878, 371. 



9 % . — 7-10 mm. Ferruginous, with face, mouth-parts, tegulae, spot in front 

 and beneath, a more or less distinct broad lateral line on margin of mesonotum 

 and in % scape beneath, four anterior coxae and trochanters and usually the 

 pectus, sternum and lower pleurae, pale yellow; wings subhyaline. nervures 

 brown, stigma yellow ; transverse median and basal nervures interstitial ; abdo- 

 men slender in %, , more clavate and subcompressed at apex in 9 ; petiole long, 

 smooth, gradually broadened toward apex, spiracles tuberculate; mest)notum 

 faintly trilobed anteriorly; metathorax carinate, faintly so on dorsum. 



Seven specimens from Nevada, Washington and British Columl)ia 

 (type, coll. Amer. Ent. Soc). 



IVIe$«oIeptus egregiiis n. sp. 



% . — 6 mm. Black, with clypeus, mouth-parts and tegulae. lemon-yellow ; coxie 

 and hind femora black ; apex of hind tibiae, their tarsi and basal trochanter pice- 



TRANS. AM. ENT. SOC. XXIV. NOVEMBER. 1897. 



