. Head broadly rectangular, strongly convex, much broader 

 posteriorly than in front ; mandibles triangular, the masticatory 

 margin broad, dentate ; clypeus transverse, somewhat diamond- 

 shaped, angular anteriorly in the middle, the posterior suture not 

 distinct, sometimes effaced ; antennal carinae very wide apart, 

 laminate ; antennae 12-jointed, moderately thick, cylindrical ; eyes 

 comparatively large, placed well forward. Thorax elongate, broad 

 and strongly convex in front, the meso- and metanotuui rounded 

 above and narrower than the pronotum ; pro-mesonotal suture fine, 

 narrow, but distinct, meso-metanotal suture obsolete ; metanotum 

 posteriorly bidentate, or emarginate above ; legs stout, moderately 

 long ; femora and tibiae cylindrical, claws simple. Pedicel one- 

 jointed, the node not higher than the metanotum. more or less 

 cylindrical ; abdomen about as broad as the thorax, the 2nd seg- 

 ment longer than the 1st, the constriction between the basal two 

 segments not well-marked. 



Key to the Species. 



a. Node of the pedicel posteriorly bidentate .... 1\ sagei, p. 74. 



b. Node of the pedicel posteriorly not bidentate. 

 a'. Antennal carinae not covering the basal arti- 

 culation of the antennae P. ivrouyhtoni, p. 75. 



b'. Auteniml carinse entirely covering the basal 



articulation of the antennae P. victories, p. 75. 



9] . Platythyrea sagei, Forel, Jour. Bomb. N. H. Soc. xiii (1900), 

 pp. 314 & 315, . 



. Black, pruinose, opaque all over, not shining ; mandibles, 

 antennas and legs castaneous red. Pilosity almost entirely 

 wanting, confined to a few erect pale hairs at the apex of the 

 abdomen ; pubescence fine and silky, extremely short and to be 

 seen only in certain lights. Head not or very slightly emarginate 

 posteriorly, the scape of the antenna? extending beyond the top 



Fig. 39. PMythijrea sagei, . 



of the head ; 1st joint of the flagellum longer than the 2nd. 

 Thorax : the tooth on each side of the apex of the basal portion of 

 the metanotum tuberculate, pointing backwards and outwards. 

 Node of the pedicel slightly compressed, truncate anteriorly and 

 posteriorly, the tooth on each side posteriorly tuberculate and 

 pointing outwards and backwards. For the rest the characters of 

 the genus. 



