Cupt. P. P. King's South American Hymenoptera. 



329 



nodosum, basi inferne subtiliter retrocuspidatum ; segmentum tertiuin , 

 campanulatuin, abdominis tres partes occupans. Anun ferrugineus, mani- 

 feste aculeatus. Pedes longi, validiusculi, calcaria niimero 1:2:2, pa- 

 rium posteriorum teniiissima, subulata. Ungues bidentes. 



Taken at Rio de Janeiro and also at St. Catherine's by Lieut. Graves. 



This species cannot be referred without violence to any of the established 

 genera of Ants ; but I am not sufficiently acquainted with the family to attempt 

 characterizing the group to which it belongs. 



51. MVRMICA ? 



Species minutissima, Polistls collum mordicus amplexa, nee discriminis certioris 

 habilis. 



52. PONERA TARSATA. Fubr. 



St. Catherine's. 



53. Formica strenua, n. s. 



Glabra, ferruginea ; abdomine fusco ; antennis subclavatis. Aculeata, 

 Long. Corp. If lin. 



Corpus nitidum, glabrum. Thoracis dorsum medio depressum. 

 Port Famine. 



54. Formica castanea. Lafr. 

 St. Catherine's. 



55. Formica maculata. Fahr. 

 St. Catherine's. 



HYMENOPTERA. 



Stirps. PuPivoRA. 



Fam. ICHNEUMONID^. 



Trib. GENuiNiE. 



Gen. Ichneumon. 

 Subg. Ichneumon. 



1. xanthorrhaeus. 



2. plebeius. 



3. patricius. 

 Gen. Cri/pfus. 

 Subg. Phygudeuon. 



4. prselatus. 

 Subg. Trachysphyrus. 



5. imperialis. 

 Subg. Cri/ptus. 



