hymenoptera. 31 



101. Formica thoracica. 



Formica thoracica, Fahr. Syst. Piez. 397- 5 $ . ^ 

 Hub. Barbary. 



This is probably a pale form of F. ligniperda. 



102. Formica bicolor. 



Formica bicolor, Fabr. Ent. Syst. ii. o51. 5 S ; Syst. Piez. 

 3i)8. 8. 



Latr. Hist. Nat. Fourm. \'23. 

 Lucas, Explo. Sc. Alger, in. 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. 

 217.2-1. 

 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. !* ^ . 

 Hab. Senegal. 



106. Formica vivida. B.M. 



Worker. Length 3i 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 tnmcate at the apex ; legs 

 wanting. Abdomen subglobose ; the scale of the pediuicle 

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

 thinly sprinkled with pale erect hairs. 



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



