138 [January 



shining, the apical margin slightly emarginate in the middle; palpi 

 brownish; antennae black, basal joint loug. Thorax opaque black, very 

 thinly clothed with short, cinereous pubescence, more dense on the 

 metathorax, punctures not distinct; disk of mesothorax depressed; 

 scutellum shining ; metathorax opaque black, with a deep longitudinal 

 central channel, a deep transverse strue, much finer on the sides, the 

 truncation depressed, irregularly striated ; tegulse polished. Wings 

 fusco-hyaline, sometimes dark fuscous; in certain lights there is a beau- 

 tiful opaline reflection, a more or less deep purple or violaceous gloss. 

 Legs black, with a fine, sparse, cinereous pile ; the tibiae and tarsi spi- 

 nose. Abdomen black, somewhat silky, the apical margins of the three 

 basal segments silvery-sericeous, obsolete when viewed from the front, 

 and more or less brilliant when viewed from behind ; apical segment 

 brownish, depressed, and covered above with minute, subdepressed 

 spines. Length 6i — 8 lines; expanse of wings 11 <} — 14 lines. 

 Collection. — Ent. Soc. Philad. Three specimens. 

 Not being altogether certain of the identity of the specimen before 

 me with Dahlbom's fulit/inosa, I add a description ; should they prove 

 to be distinct, the species above may be called Larrada Dahlbomi. 



Larrada trifasciata. Smith. 



Larrada trifasciata, Smith, Brit. Mus. Cat. Hym. iv, p. 290. 

 Collection. — Ent. Soc. Philad. Three specimens. 



Larrada vinulenta, n. sp. 



Black ; face, cheeks, collar, lateral margins of mesothorax, and apical mar- 

 gins of abdominal segments, silvery-sericeous; wings subhyaline, apex darker. 



( )paque black ; face, clypeus, base of mandibles and the cheeks, bright 

 silvery; antennae black, the scape silvery in front. Thorax not dis- 

 tinctly punctured, somewhat silky; mesothorax depressed on the mid- 

 dle, more or less silvery in certain lights; the collar, lateral margins of 

 mesothorax, and the pleura, silvery; scutellum shining; metathorax 

 opaque black, indistinctly striated, slightly silvery on the verge of the 

 lateral truncation, and densely and brilliantly so on the posterior trunca- 

 tion ; tegulas and legs black, the latter more or less clothed with bright 

 silvery pile. Wings subhyaline, the apical margins tinged with fuscous ; 

 nervures fuscous. Abdomen short, ovate, black, silky, the apical mar- 

 gins of the four or five basal segments, and the apical segment entirely, 

 bright silvery-sericeous when viewed from behind, subobsolete when 

 viewed from the front. Length 31 — ±1 lines; expanse of wings 6J — 

 7-> lines. 



Collection. — Ent. Soc. Philad. Four specimens. 



