HYMENOPTERA. 73 



50. POLYRHACHIS CONSIMILIS. PI. IV. figS. 30, 31. B.M. 



Worker. Length 4 lines. Black : the abdomen covered with 

 golden pubescence. Head and thorax opake, finely rugose. 

 Thorax armed anteriorly with two stout, bent, acute spines ; 

 the metathorax with two long, slender, acute spines directed 

 backwards; the divisions of the parts of the thorax strongly 

 marked, the disk slightly convex, the lateral margins forming 

 sharp carinae. Abdomen subglobose, the scale of the peduncle 

 incrassate, somewhat oblong, with two long, curved, acute spines 

 directed backwards. 

 Hab. Sierra Leone. (Coll. Rev. D. F. Morgan.) 



This species resembles the P. Ammon, but differs in having 

 longer spines in front of the thorax, and also in having the spines 

 on the metathorax much longer and more slender. 



51. POLYRHACHIS ARGENTATUS. 

 Formica argentata, Fabr. Syst. Piez. 413. 72. 

 Hab. New Caledonia; Africa. 



Species of Australia and Tasmania. (Sp. 52-55.) 



52. POLYRHACHIS AMMON. B.M. 

 Formica Ammoii, Fabr. Syst. Ent. 394. 20 $5 ; fy Cab. Mus. Dom. 



Banks. ; Ent. Syst. ii. 361.48; Syst. Piez. 411. 65. 

 Oliv. Encycl. Meth. vi. 499. 44. 

 St. Farg. Hym. i. 221.30. 

 Guerin, Voy. de la Coq. Zool. ii. 204. 



Jerdon, Madr. Journ. Lit. fy Sci. (1851 ) ; Ann. # May. Nat. 

 Hist. 2nd ser. xiii. 109. 



Hab. Australia. 



53. POLYRHACHIS LATREILLII. 



Formica Ammon, Latr. Hist. Nat. Fourm. 132 (nee Fabr.). 

 Formica Latreillii, Guer. Voy. Coq. Zool. ii. 205. 

 Hab. Australia. 



54. POLYRHACHIS FEMORATUS. PI. IV. fig. 46. B.M. 



Worker. Length 4 lines. Black : head and thorax opake, 

 abdomen smooth and shining ; the clypeus with a slight central 

 carina; the extreme apex of the tiagellum pale rufo-testaceous, 

 the palpi ferruginous. Thorax compressed, slightly convex 

 above, the lateral margins acute, distinctly divided into three 

 portions by two transverse sutures, the anterior one curved ; tlv 



E 



