ECTATOMMA. 83 



!. Clypeus without a medial longitudinal groove. 

 a'. Second abdominal segment lone-itudinallv 



coarsely rugose - striate, no smootl 

 polished area in the middle of the 



segment above JE. cosfatum, p. 83. 



b'. Second abdominal segment coarsely and 

 comparatively sparsely punctured, 

 smooth in the middle of the segment 

 above E. coxale, p. 84. 



100. Ectatomma bicolor, Emery, Ann. Mus. Civ. Gen. xxvii ( 1889), 

 p. 493, g; forel, Jour. Bomb. N. H. Soc. xiii (1900), p. 316, g. 



. Head, thorax, legs and pedicel ferruginous red ; abdomen 

 jet-black : the head, thorax, pedicel and basal abdominal segment 

 coarsely punctate, the punctures confluent on the thorax above 

 and forming short longitudinal furrows bounded by sharp carinated 

 striae ; the legs, the 2nd and following segments of the abdomen 

 smooth, a few coarse punctures on the sides of the 2nd segment at 

 base ; the head, thorax and abdomen covered with scattered erect 

 hairs. Head broader posteriorly than in front, the mandibles 

 obscurely and finely longitudinally striate ; clypeus slightly convex, 

 rounded anteriorly ; antennal carinae wide apart ; antennae with 

 the 1st joint of the flagellum longer than the 2nd. Thorax about 

 the length of the abdomen, short, broad, arched above, the apical 

 face of the metanotum feebly denticulate ; legs moderately long, 

 pubescent, the spine on the posterior coxae pointing obliquely 

 outwards. Pedicel longer than broad, slightly attenuated ante- 

 riorly ; abdomen curved, its apex testaceous. 



Length, 5'5-6 mm. 



Hob. Assam (Long) ; Burma ; Tenasserim (Fea 4" Bingham) ; 

 extending to China and the Malay Peninsula. 



Var. minor, Forel, is smaller and devoid of the denticulations on 

 the metanotum. 



101 . Ectatomma binghami, Forel, Jour. Bomb. N. H. Soc. xiii (1900), 



pp. 316 & 317, $ . 



. Closely resembles E. bicolor, Emery, of which it seems to be 

 little more than a local variety. Besides the slight difference in 

 the position of the eyes (see key to the species), the medial furrow 

 on the clypeus is shorter and not shining but opaque, the head 

 posteriorly is not so deeply emarginate, and the flagellum of the 

 antennae is comparatively thicker. 



Length, 4-4-5 mm. 



Hob. Lower Burma, the Pegu Yoma (Allan). 



102. Ectatomma costatum, Emery, Ann. Mus. Civ. Gen. xxvii (1889), 



p. 494, ; Forel, Jour. Bomb. N. H. Soc. xiii (1900), p. 316, . 



. Ferruginous red, the mandibles, antennae and legs some- 

 what lighter in colour than the head, thorax and abdomen, 

 these latter closely and coarsely rugose-striate, except the 3rd and 



G2 



