244 BRITISH ANTS. 



Table of the Species. 



1 / Clypeus not emarginate 2 



\ Clypeus emarginate 4 sanguinea Latr. 



2 / Head deeply excised posteriorly 3 exsecta Nyl. 



(1) \ Head not excised posteriorly 3 



3 / Body robust ; head evidently broader than thorax, in the largest in- 



dividuals not, or scarcely, longer than broad ; scale hexagonal ; 

 J gaster much broader than the thorax 4 



(2) I Body more slender, head only a little broader than thorax, in the 



largest individuals longer than broad ; scale rounded ; gaster not 

 much broader than thorax 6 



4 ( Gaster brown or black, often more or less red at the base ; eyes without 

 -j or with less pronounced hairs 5 



(3) \ Gaster black ; eyes with pronounced hairs 2 pratensis Retz. 



5 f Head long and narrow, cheeks straight ; thorax more slender .... 

 | rufa v. alpina Sant. 



(4) 1 Head short, cheeks more rounded ; thorax more robust - 



I - 1 rufa L., and rufa v. rufo -pratensis For. 



6 f Body opaque 7 



(3) \ Body shining 7 picea Nyl. 



7 j Body black 5 fusca L. 



(6) \ Body at least in part red or brown - 8 



8 t Thorax chiefly dark in both large and small individuals 



-! . fusca v. glebaria Nyl. 



(7) ( Thorax largely red in the larger individuals 9 



9 C Thorax red in largest individuals only, without outstanding hairs . . 

 I fusca v. rubescens For. 



(8) 1 Thorax red generally, only infuscate in small individuals, with outstand- 

 V. ing hairs 6 rufibarbis F. 



1 / Clypeus not emarginate 2 



\ Clypeus emarginate sanguinea Latr. 



2 / Head excised posteriorly exsecta Nyl. 



(1) \ Head not excised posteriorly 3 



3 C More robust ; head broader than thorax ; thorax higher, more rounded 



above ; gaster shorter, more spherical, much broader than thorax . 4 



(2) | Less robust ; head not, or scarcely broader than thorax ; thorax not so 

 I high, flatter above ; gaster longer, not so much broader than thorax - 6 



4 / Head long, narrow, cheeks straight rufa v. alpina San. 



(3) \ Head broad, cheeks more rounded 5 



5 / Gaster smoother and shining, scarcely pubescent rufa L. 



(4) \ Gaster duller, distinctly pubescent pratensis Retz. 



6 { Body all black \ 7 



(3) \ Body in part red 8 



7 / Less shining, more punctured and pubescent and less hairy . fusca L. 

 (6) \ More shining, less punctured and pubescent, more hairy - picea Nyl. 



8 [ Thorax largely red ; outstanding hairs on thorax more abundant and 

 I distinct rufibarbis F. 



(6) j Thorax mostly black ; outstanding hairs on thorax less abundant and 

 I less distinct 9 



9 ( Epinotum almost entirely red fusca v. rubescens For. 



(8) I Epihotum black or partly black fusca v. glebaria Nyl. 



