ENTOMOLOGICAL SECTION. XVU 



Mr. E. T. Cresson exhibited specimens of several new species of 

 Hymenoptera contained in the collection of the American Entomo- 

 logical Society, and characterized them as follows : 



Ibalia rtlfipes. — 9 - — Black, face and cheeks aciculated, a carina extend- 

 ing from lower ocellus to base of antennae, mandibles piceous; thorax above 

 transversely wrinkled, upper margin of prothorax strongly earinate and 

 slightly eraarginate medially; seutelluni coarsely rugose, apex emarginate; 

 pleura shining, almost smooth; tegulse piceous; wings dusky, nervures and 

 stigma black; legs ferruginous, coxse, trochanters and posterior tibiae except 

 extreme base, black; abdomen fulvo- ferruginous, semi-transparent, upper edge 

 dusky, sides varied with yellow. Length .45 inch. 

 Hub. — Nevada. H. K. Morrison. 



Ibalia inontana. — 9- — Head, pro- and mesothorax, and spot beneath 

 tegulse luteo-fulvous; mouth, antennae, anterior middle of prothorax, scutel- 

 lum, metathorax and pleura, black; mesothorax transversely wrinkled, upper 

 margin of prothorax strongly earinate and slightly emarginate centrally; 

 scutellum coarsely rugose, apex deeply emarginate; wings hyaline, slightly 

 dusky, nervures and stigma black; legs ferruginous, tarsi paler, posterior tibiae 

 dusky; abdomen nearly twice the length of head and thorax, upper and lower 

 margins parallel, fulvo-ferrugiuous, varied with fuscous, especially posteriorly, 

 sides of middle and venter pale luteous, semi-transparent. Length .66 inch. 

 Hub. — Colorado. H. K. Morrison. 



Aulacus pallipes. — %. — Small, black; head subglobose, broad behind 

 eyes; face beneath antennae, spot beneath eyes, mandibles except tips, an- 

 tennae and legs except coxae, yellow; antennae nearly as long as the body, 

 dusky at base above; mesothorax very feebly rugose, rounded in front, not 

 emarginate; sides of pleura stained with dull yellowish; wings hyaline, 

 nervures and stigma dull ochraceous; abdomen robust, about as long as head 

 and thorax, slender at base, first and second segments except base, and the 

 venter, ferruginous. Length .26 inch. 



Hab. — Massachusetts. James Ridings. 



Pterochilus niirandus. — 9. — Large, black; clypeus narrow, lower 

 anterior orbits, broad posterior orbits, dot near summit of eyes, small trans- 

 verse spot between antennae, mandibles except tips, scape beneath, broad 

 upper margin of prothorax, tubercles, large rounded spot beneath tegulse 

 confluent with an oblique stripe nearly reaching middle coxae, two large 

 square spots on scutellum, postscutellum, metathorax except rather broad 

 median black stripe, and most of tegulse, all sulphur-yellow; clypeus sub- 

 rhomboidal, subconvex, tip truncate, labial palpi honey-yellow, fringed with 

 long pale hair; wings subhyaline with a violaceous reflection, stained with 

 yellow along costa, extreme apical margin dusky; legs black, most of coxae 

 beneath, most of four anterior femora, tips of posterior pair, all the tibiae and 

 most of tarsi, yellow; abdomen sulphur-yellow, sericeous; central stripe on 

 base of first segment ending in a spot on disk, base more or less of remaining 

 segments, transverse line on disk of second segment connected with band at 

 base by a short more or less broad median line, margins of apical segment, and 

 base of two or three basal segments of venter, black. Length .80 inch. 



