24 



MYRMICA SULCINODIS. 



petiole will serve to distinguish this sex. The worker has the 

 thorax less coarsely sculptured and the nodes smooth and shining, 

 the sculpture delicate, and very different to M. ruginodis. The 

 male has the antennae shorter intermediate between the two 

 preceding species. 



Not common in the London district, but plentiful in many 

 localities ; it is exceedingly abundant at Folkestone, Dover, and 

 Deal, also at the back of the Isle of Wight. 



4. Myrmica sulcinodis, 



Fwmina. Sordide rubida ; capite supra fuscescente ; mandi- 

 bulis, antennis apice pedibusque pallide ferrugineis ; capite, 

 thorace et petiolo longitudinaliter striatis, profunde exaratis ; 

 abdomine fusco-nigro, nitido. 



Operaria. Sordide rubida ; capite abdomineque fusco-nigrescen- 

 tibus ; mandibulis antennisque pallide rufescentibus ; capite, 

 thorace et petiolo longitudinaliter striatis, profunde exaratis ; 

 antennarum scapo ad basin parum curvato ; metathorace spinis 

 longis ; area frontali striata. 



Mas. Nigro-fuscus, nitidus, parcissime tenuiter flavido-pilo- 

 sulus ; mandibulis, antennarum flagellis, articulis pedum tar- 

 sisque pallide rufo-testaceis ; area frontali longitudinaliter 

 striata; metathorace supra, nodis segmenti primi longitudi- 

 naliter striatim rugulosis. 



Myrmica sulcinodis, Nyl. Adno. Mon. Form. Ear. Eur. p. 934 ; 

 Form. Fr. et d'Alger. p. 80. 5. 



Smith, Brit. Form. p. 119. 4. 



Mayr. Form. Austr. p. 136. 5. 

 Myrmica perelegans, Curtis, Trans. Linn. Soc. xxi. 214. 5. 



Female. Length 3 lines. Rufo-ferruginous ; the head fuscous 

 above ; the abdomen shining black or dark fuscous ; the head, 

 thorax, and nodes of the abdomen rugose-striate, or rather 

 sulcated ; the frontal area striated ; the scape slightly curved 

 at the base ; the mandibles sometimes yellowish ; the spines of 

 the metathorax long, acute, and curving slightly inwards ; wings 

 hyaline, the nervures and stigma pale rufo-testaceous. 



Worker. Length 2-2J lines. Only differs from the female in 

 the usual form of the thorax, which is more coarsely grooved ; 

 the spines of the metathorax are erect ; usually darker in 

 colour. 



