Species of British FormicidcE. 121 



striatim riigosis ; tliorace et petiolo longitudinaliter striatis, 



profunde lugosis ; antennarum scapo ad basin geniculatim flexo, 



geniculo supra acute denticulato. 

 Operaria. — Obscure rubida, sparse flavido-pilosula ; caetera ut in 



praecedente. 

 Mas. — Fusco-palHdus, mandibulis pallide rufescentibus, ihorace et 



petiolo sublaevibus j alis sub-hyalinis, nervis et stigmate pallide 



fulvis. 



Myrmica denticornis, Curtis, Trans. Linn. Soc, xxi. 215, 7, 

 tab. 23, fig. 18, 19, $, 5. 



Female. — Head above, mesothorax, scutellum and abdomen, 

 fusco- ferruginous; the metathorax and antennae pale ferruginous; 

 tlie scape, mandibles and legs pale rufo-testaceous ; the meso- 

 thorax has on each side a longitudinal fuscous stripe uniting with a 

 transverse one at the base of the scutellum ; the scape is geniculated 

 at the base, having at the upper angle an acute short tooth ; the 

 spines on the metathorax slightly divergent and curved slightly 

 inwards, they are stout, long and acute. 



IVorker. — This strongly resembles the female in its sculpture, 

 but is of an uniform dark fuscous red ; the antennae, mandibles 

 and legs fulvous ; the antennae denticulate as in the female : in 

 both sexes the first node of the petiole is ovate, the second globose, 

 both being coarsely ruoose. 



Male, — Length 2^ lines. Pale dull castaneous, sparingly pu- 

 bescent, the head irregularly and indistinctly striated ; mandibles 

 straw-coloured ; the antennae and legs fulvous ; coxae, tips of tiie 

 femora and the tarsi pale testaceous; the margin of the scutellum 

 and the articulations of the nodes of the abdomen pale testaceous ; 

 the basal node a little elongated and irregularly striate, the second 

 node as well as the disk of the thorax smooth and shining, the 

 latter faintly sculptured ; the spines on the metathorax are short 

 and acute, slightly divergent : wings slightly tinted, the nervures 

 and stigma pale fulvous. 



Mr. Curtis has described the worker and male of this very 

 distinct species; the female I describe from the collection of J. C. 

 Dale, Esq., who captured it as well as the worker in Scotland ; 

 it is most closely allied to the M. lobicornis of Nylander, but on 

 comparison with specimens of that insect presented to me by 

 that author, it is immediately seen to be abundantly distinct. 



