122 



THE CANADIAN ENTOMOLOGIST, 



with numerous punctures. .40 in. A variety occurs in California in 

 which the thorax is entirely black. 



SCUTOPTERUS, Esch. 



Two species are recorded from Canada, neither of which are known 

 to us in nature. They are, according to Dr. Sharp, different in shape 

 from the other Colymbetini proper, and remind us somewhat of large 

 Agabi. The surface sculpture consists of fine reticulations, resembling 

 that of A. tristis. They are thus separated, the measurements being those 

 of Dr. Sharp : — 



Shining black, serial punctures distinct behind. .64 in Ilornii, Cr. 



Less shining, piceous black, serial punctures indistinct behind. 



.64 in angtistiis, Lee. 



Rhantus, Esch. 



The species of this genus are often yellowish above, with black 



irrorations on the elytra, and often darker spots on the head and thorax. 



They are a little less than half an inch in length, and may be separated 



on the following characters : — 



A. Base of prothorax profoundly bisinuate, the hind angles prolonged, 



acute, black ; legs, antennie, sides of thorax and elytral epipleurse 



rufo-piceous. .40 in sinuatus, Lee. 



AA. Posterior angles of thorax not prolonged. 



b. Body beneath mainly black, more or less variegate with fulvous. 

 Thorax with two median black spots, head black, front 

 fulvous, elytra and legs fulvous, the former thickly irrorated 



with black (.47 in.) binotatus, Harr. 



Thorax yellow, front and hind margins black ; head black, 

 front and vertex fulvous, prosternum and four anterior legs 



pale (.40 in.) bistriatus, Bergstr. 



Body beneath pale (.41 in.) ; tost us, Lee. 



CoLYMBETES, Clairv. 



Rather large, elongate beetles, with trans- 

 versely striate elytra. 



A. Legs black. 



Elytra with sides and basal margin pale. 

 Sides of thorax fulvous (.64-70 



in.) longuhis, Lee. 



Elytra with basal margins and humeral 



angles pale, thorax fulvous, with transverse 



black median bar. (.74 m.) .seminiger, Lee. 



AA. Legs pale (.63 in.), (Fig. io).scu/J>ti/is, Harr. 



bb. 



