HYMEXOPTERA. 191 



16. CRYPTOCERUS OBTUSUS. B.M. 



Worker. Length 2- lines. Opake black : head large, wider 

 than the thorax or abdomen ; the sides margined before the 

 eyes and obscurely ferruginous, widely emarginate in front; the 

 posterior lateral angles of the head rounded, emarginate be- 

 tween; the antenna? rufo-piceous at their apex. Thorax: the 

 prothorax transverse, with two blunt teeth on each side; the 

 mesothorax narrowed to the base of the metathorax, the latter 

 with a short tooth at its basal angles, the apical angles being 

 produced into long stout obtuse spines. Abdomen ovate, nar- 

 rowly margined, and deeply emarginate at the base, the margins 

 at the base ferruginous ; the nodes of the peduncle transverse, 

 the second node with a short stout spine at the sides ; the entire 

 insect sprinkled with minute glittering scales. 



Hab. Brazil (Santarem). (Coll. H. W. Bates.) 



17. CRYPTOCERUS PINELII. 



Cryptocerus Pinelii, Guer. Icon. Reg. Anim. 425. 



Smith, Mon. Crypt. Trans. Ent.Soc. Lond. 2nd ser.ii.221. 19. 



Hab. Brazil (Moro-Gueimado). 



18. CRYPTOCERUS COMPLANATUS. 



Cryptocerus complanatus, Guer. Icon. Rey.Anim. 424 $5 . 



Smith, Mon. Crypt. Trans. Ent. Soc. Lond. 2nd ser. ii.221 . 20, 



Hab. Cayenne. 



19. CRYPTOCERUS PAVONII. 



Cryptocerus Pavonii, Latr. Gen. Crust, et Ins. iv. 132$ . 



Smith, Mon. Crypt. Trans. Ent. Soc. Lond. 2nd ser. ii.221 . 21 . 

 Hab. South America. 



20. CRYPTOCERUS DISCOCEPHALUS. B.M. 



Cryptocerus discocephalus, Smith, Mon. Crypt. Trans. Ent. Soc. 

 Lond. 2nd ser. ii. 222. 23. pi. 20. f. 2 $ . 



Hab. Brazil (Villa Nova). (Coll. H. W. Bates.) 



21. CRYPTOCERUS CAUSTICUS. 



Formica caustica, Pohl <^* Koltar, Bras. Ins. 17- t. . f. 12 . 

 Cryptocerus causticus, Guer. Icon. Reg. Anim. 426. 



Smith, Mon. Crypt. Trans. Ent. Soc. Lowe?. 2nd ser. ii. 222. 24. 



Hab. Brazil. 



