an Essay on the British Formicidce. 279 



Although this species appeared in the list of British Ants some 

 years ago, another species, the F. umhrata of Nylander, was 

 mistaken for and represented it in the Stephensian Cabinet ; it 

 was not, to my knowledge, discovered until last year, when I met 

 with it at Deal. 



Sub-family MYRMICID^. 



The number of joints in the palpi differing in the species; eyes 

 usually of moderate size, sometimes minute ; males and females 

 with ocelli, obsolete in the workers ; the petiole of the abdomen 

 with two nodes ; the females and workers furnished with a sting ; 

 pupae not enclosed in cocoons. 



Genus 1. Myrmica. 



The maxillary palpi 6-jointed ; the labial palpi 4-jointed ; the 

 anterior wings with the nervure at the apex of the first and 

 second submarginal cells uniting and divided in the middle by a 

 transverse nervure ; the marginal and submarginal cells incom- 

 plete ; the antennae clavate. 



Sp. 1. Myrmica rtiginodis, Nyl. 

 Sp. 2. Myrmica scabrinodis, Nyl. 

 Sp. 3. Myrmica IcEvinodis, Nyl. 

 Sp. 4. Myrmica sulcinodis, Nyl. 

 Sp. 5. Myrmica lobicornis, Nyl. 



denticornis, Curtis. 



Subdivision 2. (Tetramorium, Mayr.) 



The maxillary palpi 4-jointed ; the labial palpi 3-jointed ; the 

 anterior wings with one marginal, two submarginal and one dis- 

 coidal cell ; the clava of the antennae 3-jointed. 



Sp. 6. Myrmica ccespitum. 

 Myrmica ccespitum, Latr., Los., Nyland., Smith, Schenck, Foerst. 



Sp. 7. Myrmica lippula, Nyland. 



Worker. — Length 1 1 lines. Ferruginous : the abdomen nigro- 

 fuscous in the middle; the head and thorax finely rugose, the 

 thorax more strongly sculptured than the head ; the mouth, 

 antennae, legs, and abdomen beneath, pale ferruginous; the frontal 

 area at the base of the clypeus very smooth and shining ; the eyes 



