hymenoptera. 53 



186. Formica, herculanea. B.M. 



Formica herculanea, Linn. Faun. Suec. 1720. 

 Formica castanea, Latr. Hist. Nat. Fourm. 118. pi. iii. f. 12. A. ^ . 

 D. 9 C r? 



St'. Farg. Hym. i. 215. 21. 



Hab. North America. 



The F. castanea appears to be the highly coloured form of F. 

 herculanea : specimens from the United States are frequently 

 highly coloured, some having the basal segment of the abdomen 

 red; those from Arctic America are usually very dark coloiu-ed. 



187. Formica ferruginea. B.M. 



Formica ferruginea, Fabr. Ent. Syst. Suppl. 279. 11 ; Syst. Piez. 

 39.9. 14. 



Latr. Hist. Nat. Fourm. 94. 



Hah. North America. 



Extremely like the F. ligniperda, and apparently synon\Tnous 

 with the F. castanea of Latreille. A long series of the latter spe- 

 cies exhibits a great variation in the colouring of different indi^^- 

 duals : in some the first segment is red, in others it is merely red 

 at the base ; a few individuals have the head red ; when this oc- 

 cm's, scarcely a trace of red is observable either on the metatho- 

 rax or base of the abdomen. F. ligniperda has a close represen- 

 tative in most parts of the world : the F. consobrina of Erichson 

 scarcely differs from the European species, but is found in Tas- 

 mania. 



188. Formica Pennsylvanica. 



Formica Pennsvlvanica, £)e Geer, Hist. Ins. iii. 603.4. pi. 31. 

 f. 9, 10. 



Oliv. Encycl. Meth. vi. 501. 52. 



St. Farg. Hym.i. 213. 14. 

 Formica pubescens (var.), Latr. Hist. Nat. Fourm. 99. 



Hab. Pennsylvania. 



189. Formica triangularis. 



Formica triangularis. Say, Bast. Journ. Nat. Hist. 288. 5 $ <? . 

 Hab. North America (Indiana). 



190. Formica subsericea. 



Formica subsericea, Say, Bost. Journ, Nat. Hist. i. 289. 7 ? ^ <? . 

 Hab. North America (Indiana). 



