17^ HYMENOPTERA. 



pubescent. Head subquadrate, emarginate behind, and having 

 a deep central longitudinal channel ; the ocelli large and promi- 

 nent ; the clypeus concave, its anterior angles produced, forming 

 two acute points; the mandibles dark ferruginous, coarsely 

 striated, and armed with three acute teeth at their apex. Thorax 

 ovate, very smooth and shining on the disk. Abdomen ovate, 

 truncate at the base ; the nodes of the petiole transverse, the 

 first produced into a point in the middle of its upper margin. 



The male is about the same size as the female, the thorax 

 rufo-testaceous, the legs and antennae pale testaceous, the head 

 and abdomen dark fuscous, the mandibles and palpi pale testa- 

 ceous. The clypeus prominent, the ocelli very large ; wings 

 hyaline, with the nervures pale testaceous; the nodes of the 

 peduncle compressed and transverse ; the upper margin of the 

 first node emarginate. 



Hab. Mexico. 



Of three examples received, not two agree in colouring : the 

 specimen described I take to be the usual appearance of the 

 insect; the second has the head anteriorly, the tibiae and tarsi 

 ferruginous, the rest of the body black; the third variety is 

 black, with only a faint tinge of red on the face and mandibles. 



31. ATTA CRUDELIS. B.M. 



Female. Length 6 lines. Ferruginous, with the apex of the 

 abdomen more or less fuscous. Head very large, much wider 

 than the thorax, longitudinally striated, the striae diverging late- 

 rally on the vertex ; mandibles very stout, strongly striated, and 

 armed with a number of stout acute teeth ; the anterior margin 

 of the face, the mandibles beneath, and the cheeks, fringed with 

 long pale yellow hairs. Thorax subglobose ; the disk and the 

 scutellum longitudinally striated, the metathorax transversely so ; 

 the wings subhyaline, the nervures testaceous, the stigma fus- 

 cous, the legs with glittering pale pubescence. The first node 

 of the peduncle oblong and transversely striated, the second 

 subglobose, and also striated transversely; the apical margins 

 of the segments of the abdomen fringed with long glittering 

 white hairs. 



Worker major. Rather smaller than the female, the head 

 larger, and the thorax elongate, slightly narrowed behind, but 

 the head, thorax, and nodes of the peduncle similarly striated ; 

 the mandibles shorter, stouter, black, and without teeth; the 

 cheeks have similar fringes of long hair, and the insect is 

 sprinkled over with short glittering pale hairs, like the female. 



Hab. Georgia. 



