70 HYMENOPTERA. 



front, it is oblong- quadrate, or slightly narrowed at the base, 

 having at the lateral angles above a sharp acute spine. 



Hab. Philippine Islands. 



This species approaches nearest to P. villipes, from which it 

 differs not only in having longer legs nearly destitute of hairs, 

 but the form of the scale is very different. 



42. POLYRHACHIS MALIGNUS. PL IV. fig. 44. B.M. 



Female. Length 5| lines. Opake-black : the anterior mar- 

 gin of the clypeus notched in the middle. Thorax elongate- 

 ovate, with an angular tooth or spine on each side of the pro- 

 thorax ; the metathorax has also a very stout spine at the lateral 

 angles of its superior surface ; the scale of the abdomen quadrate, 

 with two very stout spines which curve backwards over the base 

 of the abdomen ; the mesothorax with an impressed abbreviated 

 line in the middle anteriorly, the margins of which are smooth 

 and shining; the wings subhyaline, their nervures rufo-testa- 

 ceous, with the stigma darkest; legs without spines or hairs. 

 Abdomen subglobose. 



Hab. Philippine Islands. 



43. POLYRHACHIS CYANIVENTRIS. PI. IV. fig. 47. B.M. 



Worker. Length 4 lines. Head and thorax green, and with 

 a cinereous pilosity ; legs and antennae black ; the abdomen of a 

 dark blue-green, entirely subopake. Head oblong, scarcely 

 narrowed behind the eyes, the hinder margin transverse; the 

 head and abdomen very finely longitudinally aciculate, the 

 thorax rather coarsely so; antennae not quite so long as the 

 body. Thorax rather short, flattened at the sides and above, 

 widest in front ; the divisions of the pro-, meso- and metathorax 

 distinctly marked, the metathorax abruptly truncated, the verge 

 of the truncation margined; the prothorax with a stout acute 

 spine at the anterior lateral angles ; legs smooth, without spines 

 or pubescence. Abdomen ovate ; the scale of the peduncle very 

 broad in front, slightly rounded, behind slightly concave, the 

 superior margin nearly straight, its lateral angles with a short 

 acute spine, which has a smaller one at its base outside. 



Hab. Philippine Islands. 



44. POLYRHACHIS ACICULATUS. PL IV. figs. 17, 18. B.M. 



Worker. Length 2J- lines. Head and thorax obscurely purple, 

 abdomen bright purple. Head and thorax above, longitudinally 

 rugose ; the mandibles short and stout, obliquely truncated at 

 the apex, the truncation with four short teeth ; the mandibles 



