302 HYMENOPTERA. 



silvery pubescence ; the clvpeus rounded anteriorly ; the man- 

 dibles rufo-piceous at their apex. The mesothorax very convex, 

 closely and finely punctured, not shining ; the metathorax short, 

 finely shagreened, rounded posteriorly ; wings subhyaline, with 

 a beautiful iridescence, the marginal cell without ajjpendage ; the 

 nervures and scales ferruginous ; the legs covered with silvery 

 pile ; the calcaria, spines and claws testaceous. Abdomen smooth 

 and shining, the segments bordered with silvery bands. 



Hah. New Holland. 



25. Tachytes hypoleius. B.M. 



Female. Length 5} lines. — Black : the head subopake and 

 sparingly punctvu'ed; the clypeus rounded in front, the sides 

 emarginate ; the mandibles rufo-piceous. The mesothorax and 

 scutellum slightly shining, with delicate scattered punctures ; the 

 metathorax about the same length as the mesothorax, widest at 

 the base, the apex truncated ; the disk finely shagreened, the 

 truncation and sides strigose ; the wings fuscous, with a shght 

 violet iridescence; the marginal cell ajjpendiculated, the third 

 submarginal cell curved and of equal width ; the posterior tibiae 

 covered with silvery pile within. Abdomen smooth and shining, 

 covered with a thin silky pile, the apical margins of the segments 

 with silvery bauds ; the apical segment smooth and shining, not 

 margined at the sides ; beneath, very smooth and shining. 



Hab. Austraha (Swan River). 



26. Tachytes nigerrimus. B.M. 



Larra nigerrima, White, Zool. Erebus and Terror. 



Female. Length 5^ lines. — Intensely black and shining, the 

 face with a thin silvery pubescence ; the clypeus rounded ante- 

 riorly and emarginate in the middle. The mesothorax and scu- 

 tellum sparingly and delicately punctured ; the metathorax trun- 

 cate behind, finely shagreened and opake ; the truncation trans- 

 versely striated, the sides obliquely so ; the wings hyaline, the 

 nervures black, the marginal cell without an appendage at the 

 apex, having merely a fuscous line. Abdomen short and conical, 

 very smooth and shiniug. 



Hab, New Zealand. 



27. Tachytes sericops. B.M. 



Larra sericops. White, Zool. Erebus and Terror. 



Female. Length 3^ lines. — ^^Black : the head and thorax covered 

 with short cinereous pubescence, the face covered with silvery 



