HYMENOPTERA. 71 



longitudinally striated, their apex obscurely rufo-piceous ; the 

 head and scape of the antennae sprinkled with longish black 

 hairs. Thorax slightly convex above ; the division between the 

 meso- and metathorax marked by a deep suture, that between 

 the pro- and mesothorax slightly marked ; the thorax narrowed 

 to the base of the metathorax, the lateral margins of the latter 

 rounded, all the margins crenulated; the thorax and legs 

 sprinkled with erect black hairs ; the scale of the abdomen in- 

 crassate, prolonged laterally into an acute spine, the abdomen 

 sprinkled with tine black, erect hairs. 



Hob. Philippine Islands. 



Species of Africa. 



45. POLYRHACHIS CARINATUS. PL IV. figs. 48, 49. B.M. 



Formica carinata, Fabr. Syst. Piez. 413. 71- 

 St. Farg. Hym. i. 220. 28. 



Jerdon, Madr. Journ. Lit. Sf Sc. (1851) 126; Ann. fy Mag. 

 Nat. Hist. 2nd ser. xiii. 109. 



Hab. New Caledonia; W. Africa; Port Natal. 



This insect is very probably the worker of P. militaris ; and 

 possibly the carinatus of Fabricius may not be identical; in 

 every particular it agrees with the description, but has in addi- 

 tion a short tooth at the base of the spines on the node of the 

 peduncle ; but this might very easily have been overlooked. 



46. POLYRHACHIS viscosus. PI. IV. fig. 41. B.M. 



Worker. Length 2 lines. Opake-black : head and thorax 

 finely rugose, abdomen delicately shagreened. The thorax with 

 a short, stout, acute tooth at each of its anterior angles, and also 

 a minute one at the posterior angles of the metathorax ; the 

 divisions of the parts of the thorax strongly marked, the disk 

 slightly convex, with the lateral margins acute. The scale of the 

 peduncle incrassate, subquadrate, with a long, acute spine at each 

 of the superior angles, and two shorter ones between them. 

 Abdomen subglobose. 



Hab. Port Natal. 



47. POLYRHACHIS GAGATES. PI. IV. fig. 14. B.M. 



Worker. Length 3J-3-J lines. Jet-black : head and thorax 

 subopake ; abdomen very smooth and shining. Head and thorax 

 finely longitudinally rugose and thinly covered with fine, short, 

 cinereous pile ; the disk of the thorax flattened, the lateral mar- 



