746 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



extremity ; on the other hand some females are quite without sexual sculpture, 

 resembling exactly in this respect the males ; the females with highly developed 

 sculpture have also a distinct, though not great, torsion of the epipleurae, and even 

 in the smooth females a very slight departure from the male structure in this respect 

 may be observed ; intermediate specimens between these forms occur. 



The species also varies a good deal in size and form, and also somewhat in the 

 extent of the pale colour on the breast, and also somewhat in the depth of the 

 rugulosities on the elytra ; the oedeagus varies very little however even in the most 

 different individuals. 



The .species is readily distinguished by the peculiar roughness on the elytra ; 

 this character cannot however be seen in the case of such females as have the 

 elytra quite covered with sexual sculpture ; the extent of pale colour on each side 

 of the breast is always less than in the allied species with which it might be con- 

 founded. Widely distributed in the Malay peninsula and archipelago. 



Siani, Penang, Cambodia, Malacca, Sumatra, Borneo, Java. 1098. 



1168. Cybister (Trogus) godeffroyi, Wehncke, Stet. Ent. Zeit. XXXVII, p. 

 357. — Ovalis, latus, anterius fortiter angustatus, parum convexus, nitidus, niger, 

 capite anterius prothoraceque ad latera testaceis, elytris vitta intramarginali, ad 

 apicem obsoletescente, testacea ; pedibus quatuor anterioribus testaceis, intermediis 

 tibiis piceo-testaceis, tarsis nigris, pedibus posterioribus nigris, geniculo superne 

 rufescente. Long. 34, lat. 192 m.m. 



In the male the front tarsi are not large, scarcely attaining 3 m.m. in the trans- 

 verse direction ; the intermediate feet have large patches of short sexual pubescence 

 on each of the two basal joints, and there is generally a very slight line of such 

 pubescence on the following joint, their claws are unequal but rather .short in com- 

 parison with the allied species. The female is without sexual development ; the 

 upper surface being quite smooth as in the male, and the epipleurae simple. 



The species cannot be easily mistaken for any other, it is rather larger and 

 broader than D. rceselii (No. 1169), and quite as similar at first sight to it as to D. 

 limbatus (No. 1157) ; from this latter it can be easily distinguished by the yellow 

 band of the elytra being indefinite at the termination ; from D. rceselii the 

 colour of the undersurface distinguishes it at a glance. 



The structure of the oedeagus is peculiar, and shows the species is really an 

 isolated one. 



Australia, (Cape "iork, Eockhampton, Clarence Kiver). 1099. 



