REMARKS ON THE COLEOPTERA. 217 



lateralis. cinctus. 



minutus Linne, Aube, 683. ELMIS Latr. 



revolvens. bivittatus Dej. Cat. 



circumnans. LIMNIUS Illiger. 



duplicates. M fastiditus. 



longiusculus. HYDROCHUS Germ. 



analis Say. Am. Tr. 2, 108. scabratus Muls. An. Lugd- 1, 373. 



nee Kb. N. Z. 91. gibbosus Mels. P. Ac. 2, 99. 



Sayi Aube, 699. rufipes Mels. ibid. 100. 



DINETJTES. HYDR.ENA Kug. 



assimilis Aube', 1 78. tenuis. 



Gyr. americanus S. Am. Tr. 2, 107. OCHTHEBIUS Leach. 



Cydinus assim. Kb. N. Z. 78. M cribricollis. 



discolor Aube, 778. M nitidus. 



Cyclous labratus Mels. P. Ac. 2, 29. HELOPHORUS Fdbr. 



HETEROCERUS Fabr. 60 oblongus. 



ventralis Mels. P. Ac. 2, 98. 61 lacustris. 



undatus Mels. ibid. 2, 98. lineatus Say. J. Ac. 3, 200. 



angulatus. apicalis. 



apicalis. nitidus. 



57 L. fastiditus. Fusco-ameus, thorace convexo, pubescente, minus dense punctate, 

 lateribus rectis, marginatis, basi media producto, emarginatoque, angulis posticis acutis, 

 utrinque ad basin impresso ; elytris striato-punctatis, interstitiis subtiliter punctulatis 

 breviter flavo-pubescentibus vitta utrinque laete flava ad humerum paulo dilatata. Long. 

 11. Maple Island. 



58 0. cribricollis. .ZEneo-testaceus margine pedibusque pallidioribus, thorace lateribus 

 rotundato basi bisinuato, grosse punctato, canaliculate, lineaque arcuata utrinque ante 

 medium ; elytris punctato-striatis. Long. -08. Eagle Harbor. 



59 O. nitidus. JEneo-niger, pernitidus, thorace lateribus rectis basi utrinque obliqua, 

 angulis anticis productis apice rotundatis, profunde canaliculate, antice utrinque bifo- 

 veato fovea externa majore, basi utrinque fovea parva, et ad angulos posticos fovea 

 magna exarata, elytris punctis discretis majusculis seriatim positis ; antennis pedi- 

 busque testaceis. Long. -07. Eagle Harbor. 



60 H. oblongus. Elongatus, parallelus, testaceus capite obscure viridi, subtiliter 

 punctato, thorace lateribus rectis basi utrinque obliqua, apice fere truncata, obsolete 

 punctulato, lineis intermediis fere rectis ; elytris apice rotundato-subtruncatis, profunde 

 crenato-striatis, gutta parva nigra versus medium utrinque ornatis. Long. '23. Eagle 

 Harbor. 



61 H. lacustris. Oblongus, supra obscure testaceus, capite viridi thoraceque granulis 

 minus elevatis dense adspersis, hoc lateribus vix rotundatis, basi utrinque sinuato, 

 angulis anticis prominulis, lineis 5 fortiter impressis, intermediis valde curvatis, elytris 

 pone medium vix oblique attenuatis fortiter crenato striatis, interstitiis 5 to 7 mo que 

 dorso paulo acutis ; utrinque versus medium guttis 1 vel 2 fuscis signatis. Long. '23. 

 Eagle Harbor. 



15 



