86 FORMICIDJE. 



Key to the Species. 



A. Node of the pedicel convex in front; the 



upper portion of the posterior face bevelled 

 off towards the front. 



a. Length over 9 mm. 



a'. Abdomen finely and closely punctured, 



opaque, not shining ................ E. astutus, p. 86. 



V. Abdomen smooth, highly polished and 



shining. 



a*. Mandibles with 10 or 11 small teeth. E.javanux, p. 86. 

 &-. Mandibles with only 7 comparatively 



large teeth .................... E. maternus, p. 87. 



b. Length under 6 mm ................... E. annamitus, p. 87. 



B. Node of the pedicel not bevelled, flat and 



truncate anteriorly and posteriorly ...... E. leeuivenhoeki, p. 88. 



104. Ectomomyrmex astutus, Smith (Pachychondyla), Cat. vi (1858), 



p. 107, $. 



Ectomomvrmex sundaicus, Mayr, Tijds. v.Ent. x (1867), p. 85, $ ; 

 Forel, Jour. Bomb. N. H. Soc. xiii (1900), p. 321, $ . 



. Black, the mandibles and the tibiae and tarsi of the legs 

 deep castaneous red ; the head, thorax and abdomen covered with 

 short erect reddish-yellow hairs and a fine thin sericeous recumbent 

 pubescence, visible only in certain lights. Head very finely and 

 closely striate, the striae diverging posteriorly from a medial line ; 

 the emarginate portion of the occiput smooth and shining, with a 

 few oblique striae in the middle ; the lateral angles of the head 

 acute. Thorax : the pronotum convex above, narrowed anteriorly 

 into a neck, closely finely striate, the striae concentric ; meso- and 

 metanotum somewhat more coarsely longitudinally striate, the 

 basal portion of the metanotum short, not longer than the apical 

 sloping portion, the latter seen from the back subcordate in shape, 

 widening in the middle, finely longitudinally striate; legs mode- 

 rately long, robust. Node of the pedicel rugose above, transverse, 

 striate in front ; abdomen very finely and closely punctured, 

 opaque, and bearing scattered piligerous points, the apical margins 

 of the 2nd and succeeding segment, very narrow and obscurely 

 reddish. 



Length, g 12'5-13 mm. 



Hob. Assam (Smythies) Burma ; Tenasserim (Pea <$,- Binf/ham)', 

 extending to Australia. 



I have compared specimens of E. sundaicus, Mayr, named by 

 Dr. Forel, with the type of Pachychondyla astuta, Smith, in the 

 British Museum, and there cannot be the shadow of a doubt as to 

 their identity. 



105. Ectomomyrmex javanus, Mayr, Tij<k.v.Ent.-x. (1867), p. 84, $; 



Forel, Jour. Bomb. N. H. Soc. xiii (1900). pp. 321 & 322, $ . 



$ . Eesembles E. sundaicus, but is smaller, with the sculpture 

 of the thorax and abdomen different. Black ; the mandibles, 

 antennae and legs, except the anterior and intermediate coxae, 



