134 Mr. G. J. Arrow on Cohoptera 



angulatis, angulis anticis fere rectis, posticis obtusis, margine 

 postico trisinuato ; scutello parce subtilissirae punctulato ; elytris 

 brevibus, politis, prope suturam et latera solum lineis punctorum 

 obsoletorum ; pygidio convexo, crebre punctato, 

 $ . Capite punctato-rugoso, carina transversa, medio fere angulata 

 munito ; prothorace leviter punctato, punctis dorsi postice fere 

 obsoletis, lateribus medio fere angulatis, margine postico minus 

 sinuato ; elytris politis, obsolete puuctato-striatis ; pygidio dense 

 fulvo-hirto. 



Hah. BUie. 



This is a very distinct species owing to the extremely 

 smooth and glossy surface of the prothorax and elytra, esp<;- 

 cially in tlie male. Of the four specimens in our collection 

 tlie two females are a lighter red colour than the male, 

 but this difference may not be constant. The male, as is 

 usually the case in the genus, is shorter and more parallel- 

 sided than the female. It is also almost devoid of punctures 

 upon the thorax and elytra. The thorax is only slightly 

 excavated in front and the hind margin of the cavity is not 

 at all produced or carinated. In the female the sides of tlie 

 thorax are less uniformly curved, there are punctures which 

 become denser at the front and sides, and the elytra are 

 obsoletely striate-punctate. 



All the males in this and the allied genera have the front 

 tarsi thickened and their inner claws strongly hooked and 

 very broad. 



The genus Astahorus, which has not hitlierto been asso- 

 ciated with Pycnoschema and in the Munich Catalogue is 

 widely separated from it, is really a section in which the 

 thoracic armature has reached its greatest development. As 

 the number of known species increases it may very possibly 

 become inseparable from rycnoschema. I have identified 

 both sexes of Astahorus Antinorii, Gestro, the female of 

 which has a curved ce})halic horn and bifid thoracic process 

 very much as in the male, but the former is less flattened 

 and the latter less produced and very strongly punctured all 

 over. As there can be no doubt that the very nearly related 

 typical species, A. anuatus, Thoms., has a similar female, 

 the armature of this sex forms the best distinctive character 

 of Astahorus. There is also a slight elongation of the front 

 tibiae in the nuile, a feature which is not found in the known 

 species of Pycnoschema. 



M. Raffray seems to have overlooked the existence of the 

 latter genus when he described four species nearly related to 

 its typical forms, which he placed in Astahorus as a new 

 section of that genus. The two species of Astahorus I have 



