POLTRHACniS. 399 



474. Polyrhachis mutata, SimVi, Cat. vi (I808), p. 64, pi. iv. tif2<. \-2, 

 1:5, ^ . 

 Polyracliis mutata, >Smith, race ajax, Forel, Jour. JJomh. JN. H. Sue. 

 viii (1893), pp. 24&;ii>, ^. 



^ . llesembles P. abdominalis, Smith, but is more slenderh' made, 

 with the thorax much narrower and the thoracic and pedicel spines 

 longer and more slender. Black, the abdomen from a brownish 

 black or dark brown to dark red. Head, thorax and abdomen 

 minutely rugulose granulate and opaque, 

 the abdomen more minutely rugulose than 

 the head and thorax; pilosity extremely 

 sparse, confined to the extremities of the 

 head and abdomen ; pubescence extremely 

 .^. ,,, ,. , , ,. thin and minute, visible only in certain 

 mutata,^. Thorax. lights. Head with the posterior portion 

 retreating and only lightly convex, the 

 sides nearly straight; the eyes prominent, placed above the middle 

 and rather forward; mandibles broad and powerful, armed with 5 

 teeth, finely striate towards the apical margin ; clypeus nearly flat, 

 very indistinctly subcarinate down the middle ; antennae long and 

 slender, the scape extending more than half its own length beyond 

 the top of the head. Thorax : the pro- and metauotal spines very 

 long, almost horizontal and level with the back, divergent forward 

 and backward respectively, the pronotal spines slightly curved 

 downwards ; pronotum between the spines fiat ; mesonotum slightly 

 longitudinally concave, strongly margined ; metanotum very 

 narrow, concave from side to side and laterally margined, the 

 margins in a line with the base of the metanotal spines; legs long, 

 the tibiai remarkably compressed and fiattened, with a row of short 

 but distinct spines on their internal margin. Pedicel tliick, cylin- 

 drical, truncate posteriorly, and armed with two long divergent 

 spines curved to the abdomen, not so slender as the metanotal 

 spines ; abdomen subglobose. 

 Leu</(h, ^ 7-8 inm. 



Hah. Burma : Pegu Yoma, Maymyo, 3000 feet ; Tenasserim 

 (Bin(/ham). 



it is somewhat doubtfully that I join the race aja.c. Forel, 

 with mutata. Smith. Though originally collected by myself, I have 

 now only one mutilated specimen of P. ajax named by Dr. I'Vjrel. 

 This latter seems to me smaller, with a proportionately sliorter, 

 broader head and thorax than typical P. mutata, Smith, which I 

 got plentifully at Maymyo. 



475. Polyrhachis hinghami. Fond, Jour. Bumb. X H. Soc viii (1893), 

 pp. 25 & 33, ^ . 



5 . Closely resembles P. mutata. Smith, especially the race a/ax, 

 Forel, but is a smaller and more stoutly built insect, entirely black 

 and slightly more coarsely granulate. Head somewhat shorter and 

 squarer ; clypeus slightly more convex ; pronotal spines shorter, 

 stouter and straighter, not curved; mesonotum transversely convex. 



