180 HYMENOPTERA. 



sparingly punctured, the base of the second and third segments 

 irapunctate, the apical margins of the segments obscurely rufo- 

 piceous ; the nodes of the petiole incrassate, the upper surface of 

 the second node inclined obliquely forwards. 



Hab. Port Natal. 



Genus 6. (ECODOMA. 



Formica, pt., Linn. Syst. Nat. i. 964 (1766). 



Atta, pt., Fabr. Syst. Piez. 421 (1804). 



(Ecodoma, Latr. Nouv. Diet. d'Hist. Nat. xxiii. (1818). 



We are indebted to Mr. H. W. Bates for the following obser- 

 vations on the economy of the species of this genus ; but notwith- 

 standing these various communications, as well as other recorded 

 histories, w r e are still at a loss for satisfactory information, such 

 as would enable us to unite the various sets of workers with their 

 legitimate parents; we are acquainted with three very distinct 

 forms of males as well as females, but have no data whereby to 

 connect these with the working communities. 



DIVISION 1. 



The first submarginal cell of unequal width, pointed at the base 

 and transverse at the apex ; the recurrent nervure received within 

 the first submarginal cell near its apex. 



1. CECODOMA CEPHALOTES. PL X. figs. 21-23. B.M. 



Formica cephalotes, Linn. Syst. Nat. i. 964. 15 $ , major. 



Fabr. Syst. Ent. 395. 22 ; Spec. Ins. i. 493. 31 ; Mant. i. 

 310. 38 ; Ent. Syst. ii. 362. 52. 



De Geer, Mem. Ins. iii. 604. 5. t. 31. f. 11 $ . 



Oliv. EncycL Meth. vi. 499. 47. 



Latr. Hist. Nat. Fourm. 222. pt. 9. f. 57. A. 

 Formica fervens, Drury, Illust. Exot. Ins. iii. t. 42. f . 4 $ . 

 Formica migratoria, De Geer, Ins. iii. 604. 5. t. 31. f. 11 . 

 Formica grossa, Oliv. EncycL Meth. vi. 499. 35 $ ; Fabr. Ent. 



Syst. ii. 359. 40. 

 Atta cephalotes, Fabr. Syst. Piez. 421 . 1 . 



Latr. Gen. Crust, et Ins. iv. 124. 



Guer. Icon. Reg. Anim. iii. 422. 1. 



Erichs. Faun, et Flo. Brit. Guiana, iii. 593. 

 Madame Merian, tab. 18; Seba, iv. t. 99. f. 6. 



Hab. Brazil; Mexico. 



