326 



Key to the Species. 



a. Thorax with mesonotum remarkably long, 



strongly constricted, cylindrical .......... P. melanoy aster, p. 327. 



6. Thorax "with mesonotum shorter, not or 



only slightly constricted, not cylindrical. 

 a'. Scape of antennae remarkably long, ex- 

 tending beyond top of head by more than 

 half its length. ' 

 a 2 . Thorax not constricted at the meso- 



metanotal suture ....... _ ........... P. lonyicornis, p. 320. 



ft 2 . Thorax distinctly constricted at the 



meso-metanotal suture. 

 a 3 . Head distinctly broader posteriorly 



than in front " .............. ---- P. naorojii, p. 331. 



b 3 . Head as broad in front as posteriorly. P. birmana, p. 331. 

 V. Scape of antennae extending beyond top 



of head by less than half its length. 

 a 2 . Head oval, narrowed posteriorly. 



Length under 2 mm ............... P. taylori, p. 328. 



b 2 . Head more or less quadrangular, broad 



posteriorly. Length 2 mm. 

 a 3 . Head highly polished, smooth and 

 shining, not pilose ; only a few 

 scattered hairs on clypeus and man- 

 dibles ....................... P. bengalensis, p. 328. 



b 3 . Head not polished, only slightly 



shining, pilose or pubescent. 

 a 4 . Head above antennae with fairly 



abundant erect hairs. 

 a 5 . Clypeus very convex, rounded, 



about as broad as long ...... P. indica, p. 329. 



i 5 . Clypeus less convex, transverse, 



twice as broad as long ...... P. yerburyi, p. 329. 



ft 4 . Head above base of antennae 

 without erect hairs; only a fine 

 but very distinct pubescence .... P. aseta *, p. 331. 



371. Prenolepis longicornis, Latr. (Formica), Hist. Nat. Fourm. 

 1802, p. 113, ^ ; Ford, Jour. Bomb. N. H. Soc. viii (1894), 

 pp. 406 & 407, $ rf . 



$ . Dull coppery brown, mandibles, anbennse and legs pale 

 whitish brown, the articulations of the legs and of the segments 

 of the abdomen still paler ; head, thorax and abdomen with fairly 

 abundant, long, erect, somewhat coarse hairs. Head oval, as 

 broad in front as posteriorly, vertex rounded, not transverse, 

 sides of the head straight ; eyes very large and prominent ; 

 mandibles small and weak, the masticatory margin dentate with 

 5 or 6 teeth ; clypeus rounded, prominently convex ; antennae 

 filiform, extremely long. Thorax elongate, rounded above, the 

 sutures distinct ; viewed from the side the thorax is lightly 



* P. smythiesi. p. 330, is omitted from the key, the $ being unknown. 



