HYMENOPTERA. 3 



101. FORMICA THORACICA. 



Formica thoracica, Fabr. Syst. Piez. 397. 5 ? . 

 Hab. Barbary. 

 This is probably a pale form of F. ligniperda. 



102. FORMICA BICOLOR. 



Formica bicolor, Fabr. Ent. Syst. ii. 351. 5 $ ; Syst. Piez. 

 398. 8. 



Latr. Hist. Nat. Fourm. 12,3. 

 Lucas, Explo. Sc. Alger. iii. 302. 



Hab. Barbary. 



103. FORMICA SERICEA. B.M. 



Formica sericea, Fabr. Ent. Syst. Supp. 279. 9. 



Latr. Hist. Nat. Fourm. 117. pi. 3. f. 17 ? ; St. Farg. Hym. 



217.24. 

 Lasius sericeus, Fabr. Syst. Piez. 416. 4. 



Hab. Senegal. 



104. FORMICA LONGICORNIS. 



Formica longicornis, Latr. Hist. Nat. Fourm. 113 . 

 Hab. Senegal. 



105. FORMICA AURULENTA. 



Formica aurulenta, Latr. Hist. Nat. Fourm. 114. pi. 3. f. 9 $ . 

 Hab. Senegal. 



106. FORMICA VIVIDA. B.M. 



Worker. Length 3 lines. Jet-black, smooth and shining ; 

 head large, much wider than the thorax, deeply emarginate be- 

 hind ; the anterior margin of the clypeus slightly rounded and 

 entire ; the mandibles stout, strongly toothed within, and very 

 obscurely ferruginous at their apex. Thorax rounded in front, 

 compressed behind and obliquely truncate at the apex; legs 

 wanting. Abdomen subglobose ; the scale of the peduncle 

 ovate, its upper margin entire ; the head, thorax and abdomen 

 thinly sprinkled with pale erect hairs. 



Hab. Sierra Leone. (Coll. Rev. D. F. Morgan.) 



