304 HYMENOPTERA. 



black, the flagellum fulvous beneath ; the thorax covered an- 

 teriorly with sooty-black pubescence, posteriorly with fulvous, the 

 fulvous pubescence forming an epaulet over the tegulse ; the 

 wings fusco-hyaline ; legs dark rufo-testaceous, their pubescence 

 black. Abdomen ovate, shining, and having a little cinereous 

 pubescence at the base, the apical margin of the third segment 

 and the whole of the fourth and fifth segments covered with a 

 silvery pubescence, sometimes it has a golden lustre, the apex 

 fuscous and having on each side some long \\ bite hairs ; the 

 abdomen obscure rufo-testaceous beneath, the margins of the 

 segments palest, the two apical ones fringed with pale pubescence. 



Hab. South America. (Coll. F. Smith.) 



38. Tetralonia bifasciata. 



Female. Length 5j lines. — Black, the pubescence on the 

 head, thorax and legs fuscous, on each side of the clypeus is a 

 little that is short and white, on the cheeks it is also white ; on 

 the sides of the metathorax it is griseous ; the scopa on the poste- 

 rior tibiae in certain lights has a fulvous tint ; the flagellum ful- 

 vous beneath, the labrum, apex of the mandibles and apical 

 joints of the tarsi ferruginous ; the legs fusco-ferruginous ; the 

 wings fulvo-hyaline, the nervures ferruginous, their tegulfe rufo- 

 testaceous. The abdomen has an aeneous tinge, the margin of 

 the basal segment being narrowly rufo-testaceous, the second 

 and third segments have their margins broadly pale yellow-tes- 

 taceous, the following segments faintly testaceous ; the ])ale 

 fasciae have thin golden pubescence, the base of the abdomen has 

 a little white pubescence; beneath, rufo-testaceous, the margins 

 of the segments having a thin fringe of ciu'led white pubescence. 



Hab. Brazil. (Coll. W. W. Saunders, Esq.) 



39. Tetralonia analis. B.M. 

 Macrocera analis, St. Farg. Hym. ii. 104. 16^ . 



Hab. Brazil. 



40. Tetralonia festiva. 



Female. Length 5 lines. — Black, the pubescence on the sides 

 of the face and labrum short, dense, and of a yellowish-white, it 

 is of the same hue but thinner on the clypeus, which is coarsely 

 punctmed, apex of the mandibles yellow ; the flagellum, except 

 the three basal joints, fulvous beneath. Thorax, the disk has an 

 aeneous tinge, the sides densely clothed with a short pale fulvous 

 pubescence, on each side in front of the tegula3 is a tuft of black 

 pubescence, the scutellum is clothed with pubescence of the same 



