ECTOMOMYRMEX. 85 



Hob. Ceylon ( Yerbury, Green, Wickwar) ; extending to Borneo 

 and through the Indo-Malayan subregion. 



I procured a single specimen at .Kandy, which I identified with 

 Smith's Ponera rugosa = E. coxale, Roger, apud Emery & Dalla 

 Torre. 



Genus ECTOMOMYRMEX. 



/ Pachychondyla, pt., Smith, Cat. vi (1858), p. 107, . 



Ectomomyrmex, Mayr, Ttjds. v. Ent. x (1867), p. 83, . 



Type, E. javanus, Mayr, from Java. 



Range. The Indo-Malayan region. 



. Head depressed and somewhat flat, emarginate posteriorly, 

 with the outline of the sides of the head from front arched, the 

 cheeks flat, subrnargined ; mandibles broadly triangular, the masti- 

 catory margin dentate, the apical tooth long, acute and slightly 



Fig. 45. Ectomomyrmex: thorax of $. 

 a. Head of E. astutus. 



curved ; clypeus narrow, transverse, but acutely produced upwards 

 in the middle to between the base of the antennae ; frontal area 

 wanting; antennal carinaa somewhat close together, curved and 

 anteriorly broadened into a triangular lamina covering the base 

 of the antenna? ; antennas 1 2- jointed, long, cylindrical ; flagellum 

 slightly and gradually thickened towards the apex. Thorax short, 

 rounded and convex above, posteriorly slightly compressed, the 

 pro-mesonotal suture well marked and distinct, a wide distinct 

 suture between the epimeron and episternum of the mesothorax ; 

 the meso-metanotal suture barely indicated above, the apex of the 

 metanotum obliquely truncate, longitudinally lightly conca\e, 

 the sides submargined ; legs stout, the femora and tibiae cylin- 

 drical ; pedicel one-jointed. Node of pedicel high, on a level with 

 the thorax, very convex and rounded in front, fitting the hollow in 

 the apical face of the metanotum ; posteriorly the node is some- 

 what flat and bevelled off towards its upper margin; abdomen 

 massive, elongate, trunco,te anteriorly, the basal two segments 

 equal in length, the constriction between them moderately well 

 marked. 



Five species of the genus are known from within our limits. 

 Of these one, E. leeuwenlioeki, Forel, is slightly aberrant, the node 

 of the pedicel being different in shape from that of the others. 



