12 FORMICA NIGRA. 



Femait . Length 3 Lines.— Brown-black ; the mandibles, antennae 

 and legs pale ferruginous ; the flagellum, tibiae and tarsi darkest; 

 tin antennas and legs destitute of pubescence; the head as wide 

 ai the thorax and slightly emargrnate behind j wings hyaline, 

 with the basal b all' fuscous. 



Worker. Length H-2 lines. — Rufo-testaceous ; the vertex 

 brownish ; the front with a conspicuously impressed line. 



Mole. Length 2 lines.— Nigro-fuscous or brownish black ; the 

 antenna' and legs pale fusco-testaceous ; a deeply impressed 



line in front of the anterior ocellus; the scale notched above. 

 the basal half brownish. 



This species has long been enumerated in the list of native 

 ants, but the species which represented it was the F. umbrata of 

 Nylander. The only specimen captured in this country, that I 

 have seen, was taken by myself on the sand-hills at Deal ; it was 

 not recognized at the time of capture, or probably it would have 

 been found, on searching, not uncommon in that locality. The 

 P. marginata will very probably be found iu England"; and I 

 should have included it, had not the specimen in the Kirbyan 

 collection ticketed " emaryinata" been a worker of F. sanyuinea. 

 Latreille says F. emaryinata was sent to him from England by 

 .Mr. Kirby, but no specimens exist in the collection ; I therefore 

 leave it for its next discoverer to add to our British Formicida. 



8. Formica nigra. 



Fcemina.— Fusco-nigrescens, nitida, dense undique cinereo-nn- 

 eans; mandibulis antennisque obscure rufescentibus ; pedum 

 articulis tarsisque pallide rufescentibus ; capite thorace angus- 

 tiore; alis lacteo-albis, nervis et stigmate pallide testaceis; 

 squama verticaliter subrectangulari, supra augulis rotundatis 

 et medio subangulatim emarginata. 



Operaria.— Fusco-nigra, cinereo-raicans, nitida, sparse pilosula ; 

 antennarum scapis et mandibulis rufescentibus; tarsis et pe- 

 dum articulis pallide testaceis; squama subrectangulari, supra 

 parum vel vix emarginata. 



/ —Niger vel fusco-niger, parum cinereo-micans, nitidus ; 

 antennarum flagellis fuscescentibus, articulo primo crassius- 

 ^ulo ; squama parva, transversim subrectangulari, supra parum 

 concaviuscula. 



