Brazilian Honey Bees. 509 



beneath ; the cheeks, face, thorax beneath, and the sides of the 

 metathorax, with a fine silky cinereous pile ; the apical joints of 

 the tarsi rufo-piceous ; the wings sub-hyaline, their apex clouded, 

 darkest along the anterior apical margin. Individuals not ma- 

 tured have the scutellum, metathorax and abdomen more or less 

 obscurely testaceous ; mature examples are quite black. 



8. Trigona rujicrus, Latr. (Arapua.) 



T. nigra, nitida ; pedibus posticis, tibiis tarsisque diluto-brun- 

 neis. 



Worker. Length 3 lines. Black and shining; : the face and cheeks 

 covered with cinereous pile ; the clypeus naked and shining ; the 

 scape in front and the mandibles ferruginous ; the latter black at 

 their base and apex; the flagellum fulvous, with the basal joint 

 black. Thorax thinly covered above w-ith erect black pubescence ; 

 the wings dark fuscous, with their extremities palest ; the first 

 sub-marginal cell obliquely crossed by a narrow transparent line. 

 Abdomen depressed and very shining, some examples being faintly 

 tinged with reddish-brown. The posterior tibiae and tarsi pale 

 ferruginous ; the apical joints of all the tarsi ferruginous. The 

 mandibles strongly dentate at their apex, 



9. Trigona Momhuca. 



T. nigra, nitida ; capite antice pube cinerea tecto ; scutello 

 pedibusque obscure rufo-piceis ; alis sub-hyalinis. 



Worker. Length 2| lines. Black and shining; the face and 

 cheeks covered with cinereous pubescence ; the scape ferruginous 

 in front, the basal joint black ; the tips of the mandibles ferru- 

 ginous. Thorax : beneath and on the sides with a thin, short, 

 cinereous pubescence ; the disc with scattered, erect, black 

 pubescence ; the scutellum fringed behind with ferruginous hairs ; 

 the legs sometimes obscurely rufo-piceous, or only so beneath in 

 other examples ; the wings hyaline, the nervures pale rufo-tes- 

 taceous. Abdomen : the apical segments with their posterior 

 margins fringed with cinereous pubescence. The mandibles not 

 toothed, 



Male. The same size as the worker ; usually with the scutel- 

 lum paler, sometimes pale testaceous; the legs frequently rufo- 

 testaceous ; the posterior tibiae convex exteriorly. The abdomen 

 usually more or less rufo-piceous, particularly towards the base. 



