Species of British Formicidce. 105 



Female. — Length 3\ lines. Fuscous, the head and thorax 

 densely covered with a short fine cinereous pile ; the head as 

 wide as the thorax, the scape and base of the flagellum rufo- 

 testaceous ; tiie mandibles fusco-ferruginous ; the anterior margin 

 of the clypeus entire : the wings hyaline, the nervures testaceous, 

 the stigma fuscous ; legs pale rufo-testaceous, the base and apex 

 of the joints palest. Abdomen ovate, shining and nigro-oeneous ; 

 sparingly covered with a thin cinereous pile, not visible in long 

 disclosed specimens, the extreme apex ferruginous : the apical 

 margins of the second and third segments narrowly and obscurely 

 rufo-piceous. 



Worker. — Length 2 — 2| lines. Nigro-fuscous, thinly covered 

 with a fine cinereous pile, the antennas and mandibles as in the 

 female, the clypeus having in the centre an indistinct longitudinal 

 carina; the thorax of the same form as in F. ritfa ; the scale 

 large, rounded at the sides, and very faintly and minutely notched 

 above ; the legs as in the female, the abdomen more globose. 



Worker (minor). — The small worker has the antennas and legs 

 usually much paler than the worker (major). 



Male. — Length ?i\ lines. Nigro-fuscous, shining and elongate ; 

 the scape obscurely testaceous ; the tips of the mandibles ferru- 

 ginous ; legs pale rufo-testaceous ; the coxae at their base, and 

 the claw-joint of the tarsi, fuscous. Abdomen subaMieous ; the 

 margins of the segments slightly rufo-piceous, and submem- 

 branaceous ; the scale thickened, rounded, and widely emarginate 

 above, very closely resembling the male of F. cunicularia. — For the 

 differences see that species. 



Sp. 5. Formica full ginosa, 



Fcennna. — Nigra, nitidissima; antennispedibusquepallide rufescen- 

 tibus ; mandibulis rufescentibus ; capite magno, subcordato ; 

 squama parva, angusta, apice rotundata ; marginibus lateralibus 

 sub-parallelis : alis hyalinis, basi ad medium brunnescentibus, 

 nervis et stigmate flavido-cinerascentibus. 



Opcraria. — Piceo-nigra, nitidissima ; palpis, antennarum flagellis 

 fere totis tarsisque pallide rufescentibus, tarsis tamen dilutiori- 

 bus ; capite magno sub-cordato ; ocellis minutis : clypeo sub- 

 carinato : squama parva subovata, marginibus lateralibus pa- 

 rallelis. 



Bias. — Piceo-niger, nitidus; corpore toto sparse pilosulo; articulis 

 pedum et tarsis dilutioribus ; occipite concaviusculo ; squama 

 exigua sub-quailrata, parum rotundata, alis sicut in fbemina. 



