HYMEXOPTERA. 71 



uniting ; wings hyaline, splendidly iridescent, the tegulae and 

 nervures pale testaceous ; legs nigro-piceous, the apical joints of 

 the tarsi ferruginous, the pubescence pale fulvous, brightest on 

 the basal joint of the tarsi within. Abdomen ovate, nigro- 

 aeneous, delicately and closely punctured, at the sides and towards 

 the apex having a thin griseous pubescence ; anal rima sUghtly 

 fulvous. 



Male. — Colouring and sculptm-e as in the female; antennae 

 elongate, the flagellum fulvous beneath, the margin of the en- 

 closed space on the metathorax ridged. Abdomen elongate, 

 slightly narrowed at the base. 

 Hub. Trenton Falls, New York ; Hudson's Bay, (Coll. E. Dou- 



bleday and G. Barnston, Esqs.) 



109. Halictus imitatus, n. s. B.M. 



Male. Length 2 lines. — Head brassy green, very finely and 

 closely punctured, the flagellum fulvous beneath. Thorax blue- 

 green, shining, not so closely punctm'ed as the head; wings 

 hyaline, splendidly mdescent, tegulae testaceous, the nervures 

 fuscous ; legs rufo-testaceous, tarsi and knees pale testaceous. 

 Abdomen elongate, subclavate, rufo-fuscous, varying in depth of 

 colovu'ing, smooth, shining and impunctate. 



Obs. In general appearance resembling H. Zephyrus, but, in- 

 dependent of size, differs in the colour of the thorax, and in the 

 second submarginal cell being proportionably narrower and much 

 more contracted towards the marginal. 



Hab. North America. (Coll. E. Doubleday, Esq.) 



110. Halictus pilosus, n. s. B.M. 



Female. Length 3 lines. — Bright brassy green, head and 

 thorax finely and very closely punctured, the former thinly 

 covered with fulvous pubescence, the flagellum testaceous towards 

 the apex beneath. Thorax in front thickly clothed with a short 

 fulvous pubescence, the enclosed space beneath the post-scutel- 

 lum longituchnally rugose, the pubescence on the sides of the 

 metathorax pale fulvous; wings hyaline, splendidly iridescent, 

 the tegulae and nervures pale testaceous ; legs rufo-piceous, 

 clothed with fulvous pubescence. The basal segment of the ab- 

 domeu naked, the remaining segments densely covered with a 

 short fulvous pilosity ; the second segment usually has the pu- 

 bescence more or less obliterated on the disk. 

 Hab. North America. (Coll. E, Doubleday, Esq.) 



