Species of British Formicida. 119 



dibles pale testaceous ; antennte rufo-testaceous, the scape above, 

 and the three apical joints of the flagelliim, slightly fuscous ; ocelli 

 of a glassy brightness, very prominent, as well as the eyes ; tho- 

 rax : the mesothorax very prominent, anteriorly smooth and 

 shining, as well as the metathorax posteriorly, which is slightly 

 notclied and laterally sub-angulated; wings hyaline, nervures pale 

 testaceous, the stigma slightly fuscous; the nodes and the abdo- 

 men very glossy, the apex of the latter pale testaceous ; the 

 articulations of the legs and the tarsi pale testaceous. 



This species most closely approaches M. ruginodis; the female 

 of the present species, however, may be distinguished by having 

 the spines of the thorax smaller, being short angular processes, 

 very acute at their apex, not bent spines, as in iM. ruginodis; 

 the smooth nodes will also serve to distinguish it. The worker has 

 the spines longer than the female ; the thorax is not so coarsely 

 sculptured as in M. rughiodi'^, and the nodes are smooth and 

 shining, the sculpture on them being very delicate. The male 

 has the antennae shorter than in M. ruginodis, and intermediate, 

 as it were, between M. ruginodis and I\I. scabrinodis ; the scape is 

 about one-third of the entire length. 



This species does not appear to be so abundant as either of the 

 foregoing; I have only met with it in Sandown Bay, and in Luc- 

 comb Chine, Isle of Wight; Mr. Baly found it at Folkestone; I 

 suspect it is a local species in this country. 



Sp. 4, Myrmica sulcinodis. 



Fcemina. — Ferruginea, sparse flavido-pilosula, capite et abdo- 

 mine fusco-nigrescentibus ; mandibulis, antcnnis, thorace pedi- 

 busque pallido-ferrugineis ; capite, thorace et petiolo longi- 

 tudinaliter striatis, profunde exaratis ; antennarum scapo ad 

 basin parum subcurvato; metathoracis spinis longis. 



Opernria. — Sordide rubida, sparse flavo-pilosula, capite abdo- 

 mineque fusco-nigrescentibus ; mandibulis antennisque pallide 

 rufescentibus; capite, thorace et petiolo longitudinaliter striatis, 

 profunde exaratis; antennarum scapo ad basin parum curvato: 

 metathorace spinis longis. 



Mas. — Nigro-fuscus, nitidus,parcissime tenuiter flavido-pilosulus ; 

 mandibulis, antennarum flagellis, articulationibus pediun tarsis- 

 que pallide rufo-testaceis; alis hyalinis, nervis pallide testaceis; 

 capite, metathorace supra, nodis segmenti primi longitudinaliter 

 striatim-ruiiulosis. 



