48 HYMENOPTERA. 



This is one of those extraorchnary forms which differ so widely 

 from the geueraUty of worker ants, that it might possibly con- 

 stitute a new genus, or a distinct section ; the male and female 

 being unknown, it is retained in the genus Formica ; in form it 

 is very like F. singvlaris. 



157. Formica bidexs. 



Formica bidens, Linn. Syst. Nat. i. 964. 13. 



De Geer, Mem. Hist. Ins. iii. 600. t. 31. f. 1, 2. 



Fabr. Spec. Ins. i. 492. 24 ; Ent. Syst. ii. 360. 42. 



Oliv. Encycl. Meth. vi. 497- 36. 

 Atta bidens, Fabr. Sysf. Piez. 422. 3. 



Hab. Surinam. 



158. Formica stigma. 



Formica stigma, Fabr. Syst. Piez. 400. 18. 



Hab. South America. 



This is probably an Odontomachiis ; the black stigma is cha- 

 racteristic of all the species, and the exserted mandibles are 

 equally constant in that genus. 



159. Formica coxspicua. B.M. 



Female. Length 5-5^ lines. — Chestnut-red : the head about 

 the same width as the thorax, slightly excavated behind ; the 

 clypeus subcarinate in the middle, its anterior margin slightly 

 but widely emarginate ; mandibles strong, punctured, and armed 

 with four or live teeth. Thorax ovate ; wings subhyaline, the 

 nervm-es pale testaceous. Abdomen ovate; the apical margins 

 of the segments of a darker hue ; the scale of the peduncle wide, 

 ovate, with the margin entire. 



Hab. Jamaica. 



160. Formica saccharivora. 



Formica saccharivora, Linn. Syst. Nat. i. 963, 10. 



Fabr. Syst. Ent. 3!;2. 10; Ent. Syst. ii. 356. 24. 



Oliv. Encycl. Meth. vi. 495. 21. 



Latr. Hist. Nat. Fourm. 280. 

 Lasius saccharivora, Fabr. Syst. Piez. 417. 9. 



Hab. West India Islands. 



161. Formica femorat.\. 



Formica femorata, Fabr. Syst. Piez. 397- 3 $ . 

 St. Farg. Hym. i. 213. 15. 



Hab, South America. 



