42 HYMENOPTERA. 



Thorax rounded in front and narrowed posteriorly ; the apical 

 joints of the tarsi ferruginous, covered thinly with golden pubes- 

 cence. Abdomen subovate, covered with short golden pubes- 

 cence, and thinly sprinkled with long golden- coloured hairs ; 

 the node of the peduncle incrassate, narrow, oblong- quadrate, 

 with the margin above rounded. 



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



141. FORMICA OBSCURA. 



Female. Length 3 lines. Black : with the legs, thorax, on 

 the sides and beneath, the emargination of the metathorax and 

 the peduncle, ferruginous. Head closely and strongly punc- 

 tured, thinly covered with pale pubescence; the extreme base 

 and apex of the scape and also the base of the flagellum, the 

 clypeus anteriorly and the mandibles, ferruginous ; the antennae 

 and mandibles pubescent. Thorax strongly punctured, oblong- 

 ovate, with the metathorax abruptly truncated ; wings fusco-hya- 

 line, the anterior pair with one marginal, three submarginal and 

 one discoidal cell. Abdomen smooth, shining, and thinly covered 

 with cinereous pubescence. 



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



It will no doubt be necessary hereafter to create a new genus 

 for the reception of this remarkable species : we know only one 

 other Formica which has the wings similarly veined, and that in- 

 sect is from Australia. 



142. FORMICA VINOSA. 



Worker. Length 4 lines. Head and thorax red, claret-co- 

 loured, the legs and abdomen of a more obscure tint. Head 

 much wider than the thorax, the prothorax rounded at the sides, 

 the meso- and metathorax much narrower ; legs elongate and 

 slender ; the node of the peduncle incrassate, rounded, thick and 

 blunt above. 



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



143. FORMICA LUTOSA. B.M. 



Worker. Length 2 lines. Head and thorax of a reddish- 

 yellow ; the legs pale testaceous ; abdomen of a dirty clay colour, 

 with the margins of the segments more or less fuscous or black. 

 Head large, much wider than the thorax, smooth and shining, 

 or very obsoletely and delicately punctured, the anterior margin 



