I'm; CANADIAN ENTOMOLOGliST. 



75 



Hydroporus, Clairv. 



A large genus, difficult to deal with on account of the similarity of 



several of the species and of the difference in the sculpture, which shows 



itself occasionally in the two sexes. The annfxed table of the Canadian 



species is in the main a translation of the necessary portions of Dr. 



Leconte's arrangement of the genus in the Proc. Phil. Acad., 1855, with 



such changes in the names as will bring it into accord with our present lists: 



A^ Oblong-elongate, glabrous, thorax with basal impressed striolae, the 



whole base transversely depressed, sides forming an angle with the 



elytra. Clypeus not margined. Colour above ochreous, head with 



one, thorax with two fuscous marks, elytra each with six linear 



vittje and two submarginal spots fuscous (.17 in.) 



alpiiius, Payk., var. 12-lmeatus, Lee. 



A^. Oblong-ovate, moderately convex, confusedly punctate, pubescent ; 

 sides of thorax forming an angle with the elytra, hind angles rec- 

 tangular, clypeus truncate, colour rufo-testaceous, elytra with black 

 fascicfi (.17 in.) hybridus, Aube. 



A^ Oblong, less convex, pubescent ; elytra strongly punctured, with two 

 smooth narrow lines on each side, clypeus rounded ; above black, 

 head and elytral fasci;^ testaceous (.13 in.) . . striata piinctatus, Mels. 

 Oblong, usually obtuse in front ; thorax not or hardly forming an 

 angle with the elytra, which are without smooth lines. 



b. Pubescent ; thorax regularly evenly punc- 

 tured, 

 c. Clypeus rounded, broadly margined. 

 Colour ferruginous, thorax blackish 

 at base and apex, elytra with black 

 fasciae. 

 Thorax finely margined (.18 



in.) , . . .consimilis, Lee, 



Thorax broadly margined (.17 to 

 .18 in.) (fig. 8). .undulatus. Say. 



cc. Clypeus rounded, not margined. 



d. Colour ferruginous, elytra black, 

 with yellowish spots or vittn-. 

 e. Elytral spots forming transverse 

 fascire, thorax blackish at base (.18 \n.). spur ins, T>ec. 



A' 



Fig. 8. 



