156 Mr. G. J. Arrow on the Lamelltcorn 



clypeo brevi, quadrato ; prothorace fortiter, medio parcius punc- 

 tate), lateribus angulato-rotundatis, basi leviter arcuato, utrinque 

 profunde impretso ; scutello paulo punctato ; elytris ( $ ) pro- 

 funde striatis, striis grosse annulato-punctatis, lateribus post 

 medium angulatim dilatatis ; propygidio minute et crebre, pygidio 

 grosse, punctato, opaco ; metasterno crebre rugoso-punctato, 

 segmento utroque ventrali medio seriatim punctato et setoso, 

 ultimo grosse irregulariter puuetato ; tibiis anticis fortiter tri- 

 dentatis. 

 Long. 14-5-15-5 mm. ; lat. max. 7-8 mm. 



Bab. E. Borneo: Pontianak, Sintang; Sumatra: Si- 

 boga. 



I have seen only tliree female specimens of this interesting 

 species, two of which are in M. Rene OberthLir's collection, 

 while the type he lias kindly presented to the British 

 Museum. 



It is rather smaller than P. mono, and remarkable for the 

 iridescent bloom, like that of a black grape, with which the 

 elytra are covered. The clypeus is straight in front and has 

 v.o trace of a tubercle. The pronotum is strongly punctured 

 and bears a deep impression at the base on each side. The 

 elytra are very deeply and coarsely punctate-striate, and 

 there is an angular projection placed well behind the miJdle 

 of the outer margin of each. The last feature is certainly 

 peculiar to the female. 



Ptltonotus pritittosus, sp. n. 



Niger, nitidus, elytris sericeo-pruinosis, obscure iridescentibus, 

 corpore subtus breviter et parce fulvo-hirto ; capite sat crebre 

 punctato, clypeo subquadrato, brevi ; prothorace laxe sed distincte 

 punctato, lateribus fortiter arcuatis, basi arcuato, utrinque pro- 

 funde impresso ; scutello laevi, vix punctato ; elytris ( $ ) pro- 

 funde striatis, striis grosse annulato-punctatis, lateribus ante 

 medium fortiter impressis margiueque hie reflexo, baud dilatato ; 

 propygidio, pygidio metasternoque nitidis, grosse haud crebre 

 punctatis, segmento ventrali utroque medio seriatim puuetato et 

 setoso, ultimo parce et irregulariter haud grosse punctato ; tibiis 

 anticis longe et acute tridentatis. 



Long. 15 mm. ; lat. max. 8 mm. 



Hah. Assam: Brahmapootra Valley. 



A single female specimen taken by the late W. Doherty is 

 in the British Museum collection. 



P. pruinosus closely resembles P. malayen&is, but in the 



female sex is at once distinguished by the outer margins of 

 the elytra, which are not dilated as in the latter species, but 



