hymenoptera. 127 



50. Myrmica carbonaria. B.M. 



Worker. Length 1 line. — Coal-black, smooth and shining : 

 the antennae and legs dark rufo-fuscous, scarcely black ; the basal 

 joints of the llagelhun, the articulations of the legs and the tarsi, 

 pale rufo-testaceous, the claw-joint of the tarsi darkest. Thorax 

 about the same length as the head, with a deep strangulation 

 between the meso- and metathorax, the latter truncate behind, 

 not spined. Abdomen ovate, truncate at the base, pointed at 

 the apex, the nodes elevated and rounded above. 



Female. Length 2 lines. — Of t!ie same colour as the worker, 

 differing only in the sexual characteristics of length of thorax 

 and abdomen. 



Male. Length 2 lines. — Head and thorax opake black, the 

 legs and abdomen shining ; the clyi)eus, scutelluni, and verge of 

 the truncation of the metathorax, shining; wings colourless and 

 iridescent, the costal nervure and stigma testaceous ; abdomen 

 oblong-ovate ; the nodes of the petiole transverse, their upper 

 margin subemarginate. 



Hub. Madeira. (Coll. T. V. Wollaston. Esq.) 



51. Myrmica subopaca. B.M. 



Worker. Length 1 \ line. — Head, thorax, legs, and nodes of 

 the petiole, dull rufo-testaceous ; abdomen shining black, varying 

 in depth of colour, small workers being sometimes pale red with 

 the thorax black. The articulations of the legs and the tarsi 

 pale rufo-testaceous, the head before the insertion of the antenna; 

 and mandibles pale ferruginous ; the metathorax with a longitu- 

 dinal groove, not sjjined ; the head and thorax smooth ; the 

 nodes of the petiole elevated, lilunt above ; abdomen ovate, trun- 

 cate at the base, i)ointed at the ajjcx. 



Female. Length 2^ lines. — Opake fusco-feri'uginous ; abdo- 

 men black, with the base reddish, the articulations of the legs 

 and the tarsi pale rufo-testaceous ; the thorax in the middle in 

 front, and the scutellum, of a brighter red ; the metathorax with 

 a deep excavation ; abdomen oblong-ovate, thinly s})rinkled w ith 

 short pale glittering hairs. 



Hab. Madeira. (Coll. T. V. Wollaston, Esq.) Cape. 



52. Myrmica irrit.\ns. B.M. 



AYorker. Length 1 liire. — Pale rufo-testaceous : the head, 

 excepting its mandibles and antennae, the abdomen, excepting 

 its base, being more or less rufo-fuscous ; the femora and tibiae 

 in the middle are also darker than the other parts of the legs. 

 Head wider than the thoi'ax or abdomen, verv smooth and shining ; 



