1/0 HYMENOPTERA. 



])ubescent. 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 antennfe 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 up])er 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 anteriorl)% the tibias 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. 



.'51. 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 ])ale yellow hairs. Thorax subglobose ; the disk and the 

 scuteilum 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. 



