HYMENOPTERA. 187 



distinct ; the teeth of the mandibles and the eyes black. Thorax 

 ovate, not narrowed behind as in the workers ; the prothorax 

 with an acute tooth on each side, and also one just above the in- 

 sertion of each anterior coxa ; the mesothorax with a few short 

 scattered hairs on the disk ; the metathorax with an acute tooth 

 on each side near the insertion of the petiole of the abdomen ; 

 legs of moderate length, not elongated as in the workers. Ab- 

 domen : the upper surface irregular, with numerous pointed 

 elevations and scattered, short, stiff hairs. 



Hab. Brazil. 



15. (ECODOMA PALLIDA. B.M. 



Worker major, length 2 lines. Worker minor, H line. 

 This species very closely resembles hystrix ; its largest worker, 

 however, is smaller than the smallest of that species, and its 

 small worker the most diminutive of the genus. Mr. Bates says, 

 "Very similar to the former (hystrix) in the number of the tho- 

 racic spines, &c., but I think a distinct species. I found a pro- 

 cession of them in a sandy tract of ground ; all the individuals 

 were of a uniform pale colour. " 

 Hab. Brazil (Santarem). 



This is probably the worker of (E. ruyosa. 



Subfam. 4. CRYPTOCERID.E. 

 Genus 1. CRYPTOCERUS. 



Formica, pt., Linn. Syst. Nat. i. 965. 



Cryptocerus, Latr. Hist. Nat. Crust, et Ins. xiii. 260. 



Head more or less flattened above, quadrate or subquadrate, 

 the sides expanded into flattened marginal plates, concealing or 

 partly concealing the eyes. Antennae incrassate ; in repose, re- 

 ceived into a deep channel extending from their base above the 

 eyes towards the vertex; the scape of the antennge grooved 

 beneath for the reception of the basal joints of the flagellum. 

 Labrum transverse, its anterior margin deeply emarginate. La- 

 bial palpi 3-jointed ; maxillary palpi 5-jointed. Superior wings 

 with one marginal and two submarginal cells. Abdomen oblong- 

 ovate in the females, ovate in the males ; the peduncle with two 

 nodes. 



1. CRYPTOCERUS ATRATUS. B.M. 



Formica atrata, Linn. Syst. Nat. i. 965. 16 $ . 



Fabr. Syst. Ent. 395. 24 ; Ent. Syst. ii. 363. 54. 



