124 HYMENOPTERA. 



39. MYRMICA RUGIFRONS. 



Female. Length 3 lines. Pale reddish-yellow ; the first seg- 

 ment of the abdomen, except its extreme base, fuscous. Head 

 elongate-quadrate, the anterior and posterior angles rounded ; 

 the eyes, ocelli, and inner margin of the mandibles, black, the 

 latter denticulate ; the head rugose, with a number of longitu- 

 dinal fine carinse, the hinder margin of the vertex emarginate. 

 Thorax elongate-ovate, longitudinally rugose above, the protho- 

 rax transversely so, the metathorax concavely truncate at the 

 apex, a short spine on each side at the verge of the truncation ; 

 the legs rather paler than the body ; wings hyaline and iridescent, 

 the nervures pale testaceous. Abdomen ovate, smooth and 

 shining ; the first node petiolated at the base, the second glo- 

 bose. 



Hab. India (Penang). (Coll. East India House.) 



40. MYRMICA BIDENTATA. 



Worker. Length H line. Pale rufous ; the abdomen rufo- 

 piceous, with base and apex pale. Head oblong, very smooth 

 and shining ; the eyes small, placed rather forward at the sides 

 of the head ; the clypeus produced, concave above, the lateral 

 angles with a stout acute tooth ; the mandibles stout, and having 

 three acute teeth at their apex. Thorax oblong, with a deep 

 strangulation between the meso- and metathorax, the metathorax 

 with a minute tubercle on each side, not toothed ; the first node 

 of the peduncle clavate, the second globose. 



Hab. Calcutta. (Coll. East India House.) 



This species is readily distinguished by its bidentate clypeus. 



41. MYRMICA PELLUCIDA. B.M. 



Worker. Length H line- Head and thorax dark fusco-tes- 

 taceous, antennae and legs much paler, nearly white ; the thorax 

 with its divisions distinctly marked, that between the meso- and 

 metathorax most strongly impressed, the metathorax without 

 spines. Abdomen of a clear, pale, semi-transparent colour. 



Hab. Singapore. (Coll. A. R. Wallace.) 

 " House- Ant, very active, but not destructive." Wallace. 



42. MYRMICA FRAGILIS. B.M. 



Worker. Length 1| line. Pale flavo-testaceous, smooth and 

 shining. Head oblong- quadrate, eyes very small, placed for- 

 ward on the sides of the head; antennae clavate, the club 



