COLLECTED AT BACHIAN, KAISAA, ETC. 99 



tudinally striated and denticulate on their inner margin ; the face 

 covered with silvery white pubescence. Thorax flattened above and 

 at the sides, armed anteriorly on each side with an acute sjjine ; the 

 metathorax truncate ; the thorax, viewed laterally, is quadrate ; the 

 femora and scale of the peduncle fen-uginous ; the latter is emarginate 

 above with the angles oblique, the angles of the emargination pro- 

 duced into short acute spines. Abdomen globose, the red colour of 

 the femora reflecting on its changeable pile. (Plate I. fig. 17-) 

 Hab. Bachian. 



10. PoLYRHACHis Ithonus. P. uiger, pube argentea vestitus, pro- 

 thorace bispinoso ; petioli squamula quadrispinosa, pedibus ferrugineis. 



Female. Length 4 lines. Black, and covered with a glittering silvery 

 pile ; the mandibles shining black, longitudinally finely striated, and 

 armed on their inner edge with a row of short acute teeth. The pro- 

 thorax rounded and with a sharp spine at the lateral angles ; the sides 

 slightly rounded ; the metathorax truncate ; the legs ferruginous, with 

 the tarsi black. Abdomen globose; the node of the peduncle slightly 

 emarginate above, the lateral angles acute with a sharp spine outside. 

 The Worker has the spines on the thorax longer and acute, the sides 

 and disk of the thorax flattened, the divisions between the pro-, meso- 

 and metathorax notched at the sides. The pedimcular scale has the 

 lateral angles of the emargination above produced into acute spines, 

 the outer spines not being longer than in the female. (Plate I. fig. 18.) 



Hab. Bachian. 



11. PoLYRHACHis EuDORA. P. nigcr et vestitus pube pallide aurea; 

 prothorace bispinoso ; petioli squamula trispinosa. 



Female. Length 4 lines. Black, and densely clothed with fine silky 

 pale golden pile ; the mandibles shining black, with four or five acute 

 teeth on their inner edge. The thorax rounded anteriorly, with an 

 acute spine at the lateral angles ; the sides slightly rounded ; the me- 

 tathorax truncate behind, the lateral margins above, carinate ; the 

 legs and antennae naked. The abdomen globose ; the node of the 

 peduncle has its superior margin rounded, with an acute spine at the 

 lateral angles, and one in the centre. The Worker resembles the 

 female, but has the sides of the thorax flat, the anterior spines longer, 

 and has no ocelli, which are prominent in the female ; the spines on 

 the ])eduncular node are also longer. (Plate L fig. 19.) 



Hab. Bachian. 



This species closely resembles P. vigilans from China, but diflfers in the 

 form of the head and scale of the peduncle. 



12. PoLYRHACHis Metella. P. uigcr ct vcstitus pube pallidc am'ca ; 

 metathorax petiolique squamula bispinosis pedibus obscure ferru- 

 gineis. 



Worker. Length 4 lines. Black, and thinly covered with a changeable 

 golden pile ; head nearly oblong- quachatc ; the palpi elongate and 



