HYMENOPTERA. 45 



obluug, slightly narrowed behind ; the two apical joints of the 

 tarsi ferrug;inous; the head and thorax thirdy sprinkled with 

 pale yellow hairs. Abdomen ovate, clothed with short glittering 

 yellow hairs. 



Hab. Brazil. 



There are several specimens of this s])ecies in the Mnseum 

 Collection : a label attached to one bears the inscription, " The 

 Leaf Ant. — Island of Morajo, Brazil." 



149. Formica egregia. 



Worker. Length 6} lines. — Opake-black. Head widest in 

 front, narrowed to the eyes, from which it is narrowed again 

 abruptly backwards j antenna; elongate, nearly as long as the 

 insect. Thorax elongate, narrow ; legs elongate. Abdomen 

 siibovate, acuminate at the apex, thinly sprinkled with erect 

 black hairs ; node of the peduncle incrassate, narrow, its margin 

 rounded above. 



Hab. Brazil. (Coll. D. Swainson, Esq.) 



150. Formica abrupta. 



Worker. Length 3 lines. — Light reddish-brown, thinly 

 s]irinkled over with erect pale hairs. Head subovate, emargi- 

 nate behind; eyes round, placed midway on the sides of the 

 head ; the mandibles with a number of small black teeth on their 

 inner margin. Thorax elongate, narrowed and compressed be- 

 hind ; the raetathorax elevated, then abruptly truncated at the 

 apex, the truncation slightly curved inwardly ; the metathorax 

 above with its lateral margins raised, forming a sort of subdentate 

 process at the verge of the truncation ; legs elongate and pubes- 

 cent. Abdomen ovate ; the scale of the peduncle incrassate, 

 rounded in front to fit into the curved truncation, and hollowed 

 behind to receive the base of the abdomen. 



Hab. Brazd. (Coll. F. Smith.) 



151. Formica solitaria. PI. XIII. figs. 4, 5. 



Worker. Length A\ lines.— Opake-black, with eight or nine 

 of the apical joints of the antenna; cf a palish yellow; the man- 

 dibles and claws of the tarsi rufo-piceous. Head very large, 

 wider than the thorax or abdomen; eyes occupying the whole 

 of the sides of the head, very convex and prominent ; the clypeus 

 very Large, much produced and truncate at the apex, with a 

 central longitudinal carina, and covered with a thin grey pile ; 

 mandibles large, stout, shining, and having their inner margin 

 finely serrated ; the head emarginate behind ; the ocelli promi- 



