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 tegulae ; 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 white hairs; the 

 abdomen obscure rufo-testaceous beneath, the margins of the 

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



Hob. 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 tegulae 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 pale 

 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 curled white pubescence. 



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



39. TETRALONIA ANALIS. B.M. 

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



Hob. 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 

 punctured, 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 tegulae is a tuft of black 

 pubescence, the scutellum is clothed with pubescence of the same 



