746 On Aquatic Carnivorous Coleoptera or Dytiscide. 
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 epipleure, 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 cedeagus 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. 
Siam, Penang, Cambodia, Malacca, Sumatra, Borneo, Java. 1098. 
1168. Cybister (lrogus) 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. 193 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 femaleis without sexual development ; the 
upper surface being quite smooth as in the male, and the epipleuree simple. 
The species cannot be easily mistaken for any other, it is rather larger and 
broader than D. reeselii (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. reeselii the 
colour of the undersurface distinguishes it at a glance. 
The structure of the cedeagus is peculiar, and shows the species is really an 
isolated one. 
Australia, (Cape York, Rockhampton, Clarence River). 1099. 
