HYMENOPTERA. 307 



46. TETRALONIA DISPAR. 



Female. Length 5 lines. Black, the face covered with 

 cinereous pubescence, intermixed with some long black hairs ; 

 clypeus convex, produced, the labrum covered with yellowish- 

 white hairs, the flagellum fulvous beneath ; the cheeks have a 

 dense white pubescence. Thorax anteriorly clothed with sooty- 

 black pubescence, posteriorly with fulvous ; wings subhyaline, 

 the legs fusco-ferruginous, their pubescence black, the apical 

 joints of the tarsi ferruginous. Abdomen black and shining, at 

 the base a little fulvous pubescence, and the sides towards the 

 apex fringed with black pubescence ; the margins of the basal 

 segments beneath rufo-testaceous, the apical segments fringed 

 with sooty -black hairs. 



Hab. Peru. 



47. TETRALONIA MARGINATA. 



Macrocera marginata, St. Farg. Hym. ii. 109. 23. 

 Hab. Cayenne. 



48. TETRALONIA CAJENNENSIS. 



Macrocera Cajennensis, St. Farg. Hym. ii. 94. 6 $ . 

 Hab. Cayenne; West Indies. (Coll. F. Smith.) 



49. TETRALONIA ATRIFRONS. B.M, 



Male. Length 5 lines. Black, the pubescence on the face 

 black, that on the margin of the vertex cinereous ; the clypeus 

 yellow at its anterior margin ; the mandibles dark ferruginous, 

 and having a yellow spot a little before their apex ; the antenna; 

 entirely black. The thorax above, the metathorax, two first 

 segments of the abdomen, and a patch beneath the wings ochra- 

 ceous ; otherwise entirely black, excepting a few pale hairs on the 

 anterior tibiae behind, on the intermediate pair as well as on their 

 tarsi, and on the posterior tibiae and tarsi in front; the wings 

 subhyaline, their nervures dark brown ; the claw r -joint of the 

 tarsi slightly ferruginous, the claws black. 



Hab. Chili. 



50. TETRALONIA MELANURA. 



Tetralonia melanura, Spin. Faun. Chili, vi. 175. 2. 



Length 5 lines. Black, pubescent; thorax above and the 

 first and second segments of the abdomen clothed with white 

 pubescence ; antennae of the male longer than the body. 



Hab. ? 



