74 BRITISH ANTS. 



the winged form given by Saunders 12 is probably taken from Forel, 

 or Andre, which as pointed out by Emery 18 refers to P. eduardi 

 Forel, a species not known to occur in Britain. Saunders says he 

 has seen specimens of the apterous form (the true male of P. 

 punctatissima) from Oxford, but I have been unable to find these 

 specimens, either in his own collection, or at Oxford, or in the 

 British Museum. My description is made from a male taken by 

 Britten in a hot-house at Great Salkeld in Cumberland. 



Subfamily Myrmicinae Mayr. 



The subfamily Myrmicinae is divided into ten tribes containing 

 a large number of genera, the majority of which are cosmo- 

 politan. The workers all possess a sting, and the pupae are always 

 naked. Nine genera occur in Britain which may be distinguished 

 as follows : 



Table of the Genera. 



I 



No $ exists ............ . . . . - 3 Anergates Forel 



ty exists -------------------- 2 



Antennae 10- jointed ...... ..... 5 Solenopsis West wood 



Antennae more than 10- jointed - 

 / Petiole quadrangular ............ 1 Myrmecina Curtis 



Petiole not quadrangular - - 4 



Post petiole with a spine beneath ...... 2 Formicoxenus Mayr 



Post petiole without spine beneath - - 5 



Epinotum unarmed ............. 4 Monomorium Mayr 



Epinotum armed with two spines - - 6 



The three last joints of the funiculus together much shorter than the 



rest ..................... 6 Myrmica Latr. 



Not much shorter than the rest - -7 



Eyes small, point-like ............. 7 Stenamma West 



Eyes normal, outstanding- - 8 



Shoulders angled .............. 9 Tetramorium Mayr 



Shoulders rounded - 8 Leptothorax Mayr 



Gaster with a broad longitudinal channel ...... Anergates Forel. 



Gaster without channel - 



2 ( Club of antennae large, two- jointed ...... Solenopsis Westwood. 



(1) \ Club of antennae not two- jointed - 3 



3 f Epinotum unarmed ............. Monomorium Mayr. 



(2) \ Epinotum armed - - 4 



4 f Post petiole furnished with a spine beneath . . . Formicoxenus Mayr. 



(3) 1 Post petiole without spine beneath - - 5 



5 | Petiole quadrangular ............. Myrmecina Curtis. 



(4) \ Petiole not quadrangular - - 6 



6 / Petiole very long ............. Stenamma Westwood. 



(5) I Petiole not long - - 7 



7 ( Hairs not pointed at apex ........... Leptothorax Mayr. 



(6) \ Hairs pointed at apex - - 8 



8 f Spurs simple ; size very large in proportion to the ^ . Tetramorium Mayr 



(7) \ Spurs pectinate; size not very large in proportion to the $ - 



^ ___________ ----- ---- Myrmica Latr, 



