THE WATER SCAVENGER BEETLES. 261 



tember 7. A member of the boreal fauna. Next in size to cinctus, 

 but brownish instead of black, more oblong and less convex. 

 P. diffusus Lee, is recorded from Illinois and westward. 



506 *(1633). PHitHYDRts CINCTUS Say, Long's Bxped., II, 1824, 270; ibid. 



I, 382. 

 Oval, slightly oblong, very convex. Blaclj, shiniiij; ; entire margin dark 

 reddish-brown. Thorax with basal marginal line very fine and indistinct; 

 its surface finely and evenly punctured. Elytra a little more coarsely and 

 sparsely punctured than thorax, the dorsal rows distinct but feebly im- 

 pressed. Length 6.5-7 mm. 



Throughout the State ; common. Hibernates as imago. Febru- 

 ary 11-December 8. 



507 (1636). Philhydeus perplexts Lee, Proc. Phil. Acad. Nat. Sci., VII, 



1855, 371. 

 Oblong-oval, fully twice as long as wide. Above piceous-black, shining ; 

 sides of thorax and elytra with narrow iialer liorder. Thorax closely and 

 finely punctate, its liasal marginal line always distinct. Elytral punctures 

 coarser than those of thorax, the usual dorsal rows ferl)ly Indicated. Length 

 4-5.5 mm. 



Common throughout the northern half of State; less so in the 

 southern portion. April 23-Oetober 23. 



XII. Helochares iluls. 18-1-t. (G-r., "marsh 4- rejoice. ") 



Very close to PhiJliydDis and formerly united with it. One spe- 

 cies occurs in Indiana. 



."lOS (1639). Helochaees macdlicollis Muls., Ann. Sc. Phys. Nat. Lyon., 

 VII, 379. 

 Oblong-oval, distinctly narrowed in front, subdepressed. Above dull 

 brownish-yellow ; occiput and discal spot of thorax piceous ; under surface 

 black or piceous. Elytra with ten rather deeply impressed rows of serrate 

 punctures; intervals flat, finely punctulate, the fifth and ninth with a row 

 of coarse punctures. Length 4^5.5 mm. 



Lawrence and Dubois counties ; scarce. Jlay 9-August 5. 



XIIL Cymbiodyta Bedel. 1881. (Gr., "boat -^ dive.") 



Small, oval, piceous or brownish species, formerly included un- 

 der both Philhydrvs and Hydrocoinhus, but having only four joints 

 on the middle and hind tarsi. In the species occurring in the East- 

 ern United States the elytra are not striate, but usually have sev- 

 eral rows of coarse punctures. One species has been taken in the 

 State, while two others may occur. 



