HYMEXOPTERA. 51 



pressed posteriorly ; legs elongate, with the apical joints of the 

 tarsi obscurely ferruginous. Abdomen elongate-ovate, the apical 

 margins of the segments with a few glittering white hairs. 



Hab. Chih. 



175. Formica distinguenda. 



Formica distinguenda. Spin. Faun. Chili, vi. 235. 1 ^ . 

 Hab. Chih. 



176. Formica Chilensis. 



Formica Chilensis, Spin. Faun. Chili, vi. 237. 2 ^ . 

 Hab. Chili. 



177- Formica atriventris. 



Formica nigriventris. Spin. Faun. Chili, vi. 239. 4 (nee Guer.). 



Hab. Chih. 



Species of North America. 

 Subdivision 1. 



Anterior wings with one marginal, two submarginal and one 

 discoidal cell. The scale of the peduncle vertical and compressed. 

 The ocelli present in the males and females, usually so in the 

 workers. — Sp. 178-185. 



The American species which belong to this division, as far as 

 we have been able to ascertain, are all, except one species, com- 

 mon to Europe. Between the American and Eiu-opean specimens 

 of the following species we can detect no specific distinctions : 

 Formica rufa (Ai-ctic America) ; F. sangtdnea (Arctic America) ; 

 F.fusca (Hudson's Bay); F. umbrafa ; F. nirjra (Canada); F. late- 

 ralis (Hudson's Bay). 



Of the second division, the Formica pubescens and F. herculanea 

 of Europe are both widely distributed in America ; the latter has 

 been received from the United States, Nova Scotia, Canada, Hud- 

 son's Bay, and the Great Bear Lake in Arctic America. Formica 

 pubescens has been received from the United States and also from 

 Canada. 



178. Formica rufa. 



Formica rufa, Linn. Faun. Suec. ho. 1721. 



Hab. Europe and North America. 



