188 HYMENOPTERA. 



Formica atrata, Christ, Naturg. Ins. 516. 



Oliv. Encycl. Meth. vi. 500. 49. 



Latr. Hist. Nat. Fourm. 272. t. 12. f. 74 a ? , 74 b ? . 

 Formica quadridens, De Geer, Iras, iii. 609. 7- t. 31. f. 17-20. 

 Cryptocerus atratus, Latr. Hist. Nat. xiii. 260. t. 102. f. 1. 



Fabr. Syst. Piez. 418. 1. 



King, Ent. Mon. 260. 1. 



St.Farg. Hym. i. 170. 1. 



Gue'r. Icon. Reg. Anim. 424. t. 69. f. 3. 



Spin. Mem. Accad. Torino, 2nd ser. xiii. 63. 47 (1853). 



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



215 c? ? $. 



Cryptocerus marginatus, Fabr. Syst. Piez. 419. 2 $ . 

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

 Lond. 2nd ser. ii. 216 $ . 



Hab. Brazil; Surinam; Cayenne. 



2. CRYPTOCERUS OCULATUS. 



Cryptocerus oculatus, Spin. Mem. Accad. Torino, 2nd ser. xiii. 



65. 48 . 

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



Lond. 2nd ser. ii. 216. 3. pi. 20. f . 9 (1853). 



Hab. Brazil (Para). 



3. CRYPTOCERUS SERRATICEPS. B.M, 



Female. Length 6 lines. Jet-black : head depressed, slightly 

 convex at the vertex ; ocelli distinct ; strongly punctured and 

 slightly shining; the lateral margins elevated and finely ser- 

 rated ; deeply emarginate anteriorly ; antennae short, thick and 

 clavate, the extreme apex ferruginous. Thorax shorter than the 

 abdomen, the disk shining, with large scattered punctures ; the 

 lateral angles of the prothorax with a short, stout, acute spine ; 

 the metathorax with two short, straight, thick spines ; wings 

 hyaline, the nervures thick, and of a blackish-brown ; a fuscous 

 cloud occupying the marginal cell, and passing beyond to the 

 apex of the wings ; a narrow fuscous stain traverses all the ner- 

 vures of the wings, the stigma black ; the femora and tibiae with 

 their sides flattened, four -sided, with a few scattered pale setae. 

 Abdomen oblong-ovate, very smooth and shining, with scattered 

 delicate punctures ; the apical segments roughened, with their 

 margins smooth and shining; the nodes of the petiole sub- 

 globose. 



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



