306 HYMENOPTERA. 



clypeus with a transverse rugose furrow ; the mandibles ferrugi- 

 nous a httle beyond the middle, the tips black. The mesothorax 

 smooth and slightly shining; the metathorax transversely rugose; 

 wings black, slightly iridescent ; the legs shining, the tibiae with 

 a cinereous pile within. Abdomen subelongate, pointed at the 

 apex, the apical margins of the first and three following segments 

 with fascia? of silvery -white pubescence; the apical segment 

 carinated at the sides and rather strongly punctured. 



Hab. Brazil. (Coll. F. Smith.) 



39. Tachytes 3-cinctus. 



Liris tricincta, Fabr. Syst. Piez. 229. 5? 

 Tachytes 3-cincta, Dahlb. Hym. Europ. i. 125. 



Hab, Island of St. Thomas. 



40. Tachytes labiatus. 



Sphex labiata, Fabr. Ent. Syst. ii, 211. 52. 



Pompilus labiatus, Fabr. Ent. Syst. Supp. p. 247. 9 ; Syst. Piez. 



p. 191. 16. 

 Tachytes murina, Dahlb. Hym. Europ. i. 132 & type sp. in Mus. 



Kiel. 



Hab. South America. 



Species of North America. 

 Abdomen black. 



41. Tachytes aurulentus. B.M. 



Larra aurulenta, Fabr. Syst. Piez. 220. 7- 

 Say, Bost. Journ. i. 371. 3. 



Hab. North America. 



42. Tachytes dives. 



Tachytes dives, St. Farg. Hym. iii. 247. 8. 

 Hab. Carolina. 



43. Tachytes argentipes. 



Female. Length 7 lines. — Black : the face, cheeks and man- 

 dibles at their base covered with silvery pubescence ; the man- 

 dibles rufo-piceous ; the vertex and thorax thinly covered with 

 long pale pubescence ; the lateral and posterior margins of the 

 mesothorax, the post-scutellum, and a spot on the posterior 



