92. Omophron Sayi Kby. is americanum Dej. 



93. Haliplus impressiis Latr., erroneously determined, is ruficollts 



De Geer. 



94. Hydroporus nigrolineatus Steph. Not known to us. Is the identi- 



fication correct ? * 



95. " parallelus Say. 



96. " LAEVis Kby. This and the preceding seem to me to 



be merely varieties of catascopium Say, which Crotch 

 says is GRiSEOSTRiAius De Geer. 



97. " PiCATU.s Kby. 



98. " siMiLis Kby. is impressopunctatus Schall. (fide 



Crotch). 



99. Laccophilus biguttatu.s Kby. is proximus Say. 

 100. Colymbetes semipunctatus Kby. is a (Iaurodytes. 

 loi. " BicoLOR Kby. A Gaurodytes. 



102. " PHAEOPTERU.S Kby. is probably Gaurodytes <7/V///rr- 



atiis Lee. 



103. " F.iFARius Kby. Placed by Crotch in a new genus, 



Ilybiosoma. 



iP4. " RETicuLATDS Kby. is probably identical with Gauro- 



dytes ARCTicus Payk. 



105. " PiciPES Kby. is an Ilvdius. 



106. " ASSiMiLis Kby. 



107. " TRiSERi Tus Kby. is scuLPTiLis Harris. 



108. " RUGicoLLis Kby. is Graphoderes libepus Say. 



109. " MacCullochii Kby. is Acilius mediatus Say. 

 no. Dytiscus OoLiGBUKii Kby. is confluens Say. 



n I. " Harrisii Kby. 



112. " Franklinii Kby. is confluens Say, 7'flr. 



113. Cyclinus assimilis Kby. is Dineutus americanus Linn. 



114. Gyrinus iMPRESSicoLLis Kby. I think the reference to borealis 



Aube is correct. 



115. " aeneus Leach (Kby.) Kirby's determination is probably 



incorrect. 

 it6. " ventrams Kby. 



* Dr. David Sharp, of .Scotland, is now preparing a monograph « f the 

 Dytisoidak of this world ; and by means of typical spftcimens from Dr, Leconte 

 and myself, will settle dttinitely the synonymy of ali of Kiiby's species in thia 



f:imilv. 



