HYMENOPTERA. 411 



ceous at the base ; the posterior tibiae broadly dilated and having 

 a testaceous stain within ; the claws ferruginous. 



Hob. Brazil (Amazons). 



24. TRIGONA DORSALIS. B.M. 



Worker. Length 2 lines. Head black ; the clypeus, a tri- 

 angular spot above, the face on each side, the scape in front, 

 and the mandibles, yellow ; the flagellum testaceous in front. 

 Thorax reddish-yellow, the disk black, encircled with yellow; 

 a dark line beneath the wings and the centre of the metathorax 

 black ; legs of a yellow-red, the dilatation of the posterior tibiae 

 black; wings testaceous. Abdomen subelongate, of reddish- 

 yellow or pale ferruginous. 



Hab. Brazil (Para). 



25. TRIGONA DIMIDIATA. 



Worker. Length 4^ lines. Jet-black, the face anteriorly 

 having a short silvery pile ; the vertex, disk of the thorax and 

 legs clothed with rigid black pubescence, that on the tarsi be- 

 neath reddish-brown ; the metathorax smooth and shining, 

 pubescent at the sides ; the basal half of the wings dark brown, 

 the apical half milky-white. Abdomen elongate, smooth and 

 shining. 



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



26. TRIGONA LONGIPES. B.M. 



Worker. Length 2 lines. Black ; the inner orbits of the 

 eyes, the clypeus and a minute triangular spot above it, the 

 labrum and mandibles, yellow, the base of the latter and the 

 anterior margin of the clypeus fuscous ; the scape pale rufo-tes- 

 taceous, having a fuscous spot at the apex above ; the flagellum 

 testaceous beneath. Thorax, the collar, and a narrow line passing 

 over the tegulae, uniting with a spot on each side at the base of 

 the scutellum, yellow ; the scutellum, tegula3 and nervures of 

 the wings pale rufo-testaceous ; the wings fusco-hyaline, darkest 

 towards their apex ; legs rufo-testaceous, a line on the posterior 

 femora beneath, the apex of the intermediate tibiae, and the basal 

 joint of the tarsi black ; the posterior tibiae elongate, broadly 

 dilated at their apex, somewhat battledore- shaped, the dilatation 

 black. Abdomen testaceous, fuscous towards the apex. 



Hab. Brazil (Para). 



27. TRIGONA ZONATA. 



Worker. Length 3 lines. Head and thorax black ; a broad 



