40 



WHIRLIGIG BEETLES. 



CHART OF THE GENUS GYRINUS. 



Underside entirely rust red 



CO 



O 

 <o 

 H 



r 



Reflexed 



margin 

 thorax 

 elytra, 

 dish 



Body ovate 

 or oval. 



' Punctures on 

 elytra scarcely 

 feebler toward 

 suture 



Punctures on 

 elytra finer to- 

 (^ ward suture .. 



' Punctures on 

 elytra distinct- 

 ly finer toward 

 suture 



Punctures on 

 elytra scarcely 

 finer toward 

 suture 



of 

 and-: 

 red- 



Underside, 

 wholly or^ 

 chiefly black. 

 I legs reddish, 



Body elon 

 gate oblong,^ 

 with nearly 

 parallel sides 



' Interstices on 

 elytra impunc- 

 tate 



Body oblong! 

 ovate. 



l 



Reflexed 



margin of 

 thorax and 

 elytra, bras- 

 sy black . . 



Interstices on ely- 

 tra indistinctly 

 punctured 



Interstices on 

 elytra closely 

 and distinctly 

 punctured 



' Punctures on 

 elytra scarcely 

 finer toward 

 suture 



i 



Punctures on 

 elytra much 

 finer toward 

 suture 



minutus, Fab. 

 urinator, HI. 



natator, Scop, 



Suffriani, Scrib. 



bicolor, Payte. 



distinctus, Hub. 



Caspius, M^n. 



Colymbus, Fr. 



marinus, Gyll. 



opacus, Sahib. 



