832 R. 1. I'ococK 



Copulalonj feel relatively simple, straight, mostly cylindrical, 

 dividing at its distal end into two short pieces, a slender one 

 above and a widened davate piece below. 



Length about 31 mm. 



Loc. Malewoon (Tenasserim) Sig. L. Fea ; S. Tenasserim, 

 Mr. E. W. Gates. 



A mutilated male was obtained at each locality. Closely re- 

 lated to P. kmrinus, but differs in having more strongly developed 

 upstanding keels and longer antennae. Moreover in laurinus in 

 the hinder end of the body the posterior series of tubercles is 

 composed of six, whereas in cervinus it is composed always 

 of four. This species, which I select as the type of the genus, 

 in general appearance closely resembles Centrodesmiis typicus, 

 Poe. , from Sumatra. But in the latter the pores are just on 

 the lower surface of the keels and the 19"' keels are without 

 them , whereas in Prionopeltis cervinus the pores are conspi- 

 cuous on the keels of the 19"' and they are situated, as in 

 Strongylosoma^ in a definite furrow or a groove of the lateral 

 surface. Moreover there are no dorsal tubercles in Cenlrodesmus. 



The preceding three species may be recognised as follows : 



a Posterior row of tergal tubercles in the posterior half of the 



body composed of six] keels moderately elevated .... taarinns. 



Ò Posterior row of tergal tubercles composed of only four. 



a^ Keels scarcely at all elevated, almost horizontal . . . planatus. 

 b^ Keels larger and very strongly elevated cervinux. 



