320 AMERICAN HYMENOPTERA. 



metathorax roughened, carinse more or less distinct; abdomen slender, broadly 

 compressed and strongly clavate in 9 toward the apex, petiole very slender and 

 post-petiole but little widened ; second segment elongate. 



Four specimens from Massachusetts, Michigan, Canada and Ne- 

 vada (types, coll. Amer. Ent. kSoc). 



Var. coxatus ditfers in having the hind legs, except the coxse, rufous, and in 

 having the petiole and sometimes the base of segment 2 and the apical segments 

 dusky to black. 



Three females and one male from New York, Michigan and So. 

 Dakota (Aldrich). Types, coll. Amer. Ent. Soc. and Davis. 



Var. feinora,tii»ii differs in having the abdomen black, except segments 2-4, 

 which are usually rufous, and in having the posterior cox« and femora blHck. 



One female and three males from New York, Michigan, Colorado 

 and Idaho (Prof Aldrich). Coll. Davis and Amer. Ent. Soc. 



Hadi'Oclactyliis loiigicorniN Cress. (Mesolepfus), Pr. E. S. Phil iii, 270. 



9 'Jj . — 10 mm. Dark ferruginous, with the head opaque black, and the ster- 

 mini, pectus and lower portion of meso- and metapleurje more or less dusky ; face, 

 scape beneath, mouth-parts, tegulje, spot before, trochanters and four anterior 

 coxse, yellow; scutellum, four anterior legs and posterior tarsi reddish yellow; 

 antennje long, tapering, fulvous; wings hyaline, nervures brown ; stigma slender, 

 yellow, areolet sometimes incomplete or wanting ; metathorax smooth, polished, 

 and without distinct carina; abdomen long, slender, depressed in %, subcom- 

 pressed in 9; petiole slender, slightly broadened toward apex ; body pilose. 



Four specimens from Delaware, Massachusetts, Maine and Colo- 

 rado (types, coll. Amer. Ent. Soc). 



Hadrodat'tyliis rufivornis n. sp. 



9. — 7-9 mm. Rufous, with sutures, pectus and tip of mandibles more or less 

 black; face, mouth-parts, scape beneath, tegulse and spot before, yellow; four 

 anterior legs and posterior trochanters, yellowish ; antennje dark fulvous; wings 

 yellowish hyaline, nervures brown, stigma small, yellowish ; body covered with 

 short silver pile ; carina below metathoracic spiracles distinct, remainder of meta- 

 thorax smooth, polished ; abdomen considerably broadened, subcompressed ; 

 petiole slender, considerably broadened behind the prominent spiracles. 



Four specimens from Montana, Colorado and Nevada (coll. Am. 

 Ent. Soc. and Davisj. 



AL.EXETER Foerster. 

 Head transverse, face broad, clypeus transversely impressed on 

 the apical portion, apex more or less emarginate and basal portion 

 often transversely carinate ; parapsidal grooves and carinse on meta- 

 thorax variable. Wings large ; petiole present; humeral cross-vein 

 of hind wing broken below the middle if broken at all ; transverse 

 median and basal veins of front wing usually interstitial ; stigma 

 elongate, slender. Legs slender ; tarsi elongate, fourth njember 



