HYMENOPTERA. ^ 



186. FORMICA HERCULANEA. B.M. 



Formica herculanea, Linn. Faun. Suec. 1720. 

 Formica castanea, Latr. Hist. Nat. Fourm. 118. pi. in. f. 12. A. $ , 

 D.?,C.J. 



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



Hob. 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 coloured. 



187. FORMICA FERRUGINEA. B.M. 



Formica ferruginea, Fabr. Ent. Syst. Suppl. 279. 1 1 ; Syst. Piez. 

 399. 14. 



Latr. Hist. Nat. Fourm. 94. 



Hab. North America. 



Extremely like the F. ligniperda, and apparently synonymous 

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

 cies exhibits a great variation in the colouring of different indivi- 

 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- 

 curs, 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 Erich son 

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

 mania. 



188. FORMICA PENNSYLVANIA. 



Formica Pennsylvania, De Geer, Hist. Ins. iii. 603.4. pi. 31. 

 f. 9, 10. 



Oliv. Encycl. MeU. 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, Bost. 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). 



