punctulatus Aube. 

 chevrolatii Aube. 



Aiiisomera Aube. 

 cordata Lee. 



Agalms Leach (em. Er. 



subopacus Mann. 

 parallelus Lee. 

 hypomelas Mann. 

 seriatus Lee. 



Colymbetes seriatus Say. 

 Ag. striatus Alibi. 

 Ag. arctus Mels. 

 obsoletus Lee. 

 aeruginosus Aube. 



punctatus Mels. 

 punctulatus Aube. 

 laevidorsus Lee. 

 discolor Lee. 



Colymbetes disc. Harris. 

 morulus Lee. 

 glabrellus. 



Colymbetes gl. Motseh. 

 taeniolatus Lee. 



Colymbetes taen. Harris. 

 Ag. taeniatus Aube. 

 lineellus Lee. 

 semipunctatus Lee. 



Colymbetes sem. Kirby. 

 confertua Lee. 

 semivittatus Lee. 



var. spilotus Lee. 

 Btagninus Lee. 

 Colymbetes st. Say. 

 Ag. striola Aube. 

 gagates Aube. 

 uitidus Lee. 



Colymbetes nit. Say. 

 obtusatus Lee. 



Colymbetes obt. Say. 

 - regularis Lee'. ' 



Ilybius reg. Lee. 

 lugens Lee. 

 brevicollis Lee. 

 brachynotus Lee. 

 strigulosus Lee. 

 tristis Aube. 



var. dubius Mann. 

 scapularis Mann. 



var. anthracinus Mann. 

 morosus Lee. 

 fimbriatus Lee. 



reticulatus|| Aub'i. 

 intersectus Lee. 

 griseipennis Lee. 

 bifarius Lee. 



Colymbetes bif. Kirby. 

 inscriptus Lee. 

 2 



DYTISC1DAE. 



acuductus Lee. . 

 Colymbetes ac. Harris. 

 Ag. rugulosus AU&J. 

 discors Lee. 

 erythropterus Aubs. 



Colymbetes er. Say. 

 ovoideus Lee. 

 ): atratus Mann. 

 ambiguus Lee. 



Colymbetes anib. Say, 



Ag. infuscatus Au&J. 

 lutosus Lee. 

 obliteratus Lee. 



?Colym. phaeopterus Kirfa 



Ag. discolor|| Lee. 

 subfasciatus Lee. 

 clavatus Lee. 

 bicolor. 



Colymbetes bic. Kirby. 

 irregularis Mann. 

 sobrinus. 



Colymbetes sobr. Motseh. 

 fossiger. 



Colymbetes foss. Motseh. 



Colymbetes Clairv. 



ILYBIUS Er. 

 ungularis Lee. 

 biguttulus Lee. 



Dytiscus big. Germ. 



Col. fenestralis|| Say. 



Ilybius fen. Aufc. 



var. II. pleuriticus Lee. 

 quadrimaculatus (Aube. 

 Fraterculus Lee. 

 Laramaeus (Lee.) 

 picipes Kirby. 

 Ignarus Lee. 

 sinuatus Lee. 

 ?oblongus. 



Ilyobius obi. Motseh. 



an Ag. breyicollis Lee. ? 



MELADEMA Lap. 



angustus Lee. 

 Agabus ang. Lee. 



CYMATOPTERUS Esch. 

 obscuratus (Mann.) 

 seminiger Lee. 



ongulus Lee. 

 strigosus Lee. 

 exaratus Lee. 

 sculptilis Harris. 

 triseriatus Kirby. 

 densus Lee. 

 dolabratus Paylc. 

 groenlandicus Aube. 



Irewsenii Lee. 



binotatus Hnrrlx. 



maculicollis Aub~. 

 divisus Aube. 

 consiniilis. 



Rhantus cons. Motseh. 

 agilis Aube. 



Dytiseus agilis Fabr. 

 calidus Aub->\ 



Dytiscus eal. Fabr. 



Col. taeniolis Say. 



Hydat. ineridionulis Mels. 



DYTISCINI. 

 Hydaticus Leach. 



bimarginatus Lee. 



Dytiscus him. Say. 



Hyd. fulvicollis Auo'. 

 cinctipennis Aube. 

 piceus Lee. n. sp. 



GRAPHODERCS Esch. 

 fascicollis Harris. 



Hyd. zonatus var. Anfc. 

 liberus Lcc. 



Dytiscus lib. Say. 



D. (H.) thoracicus Harris. 



Colymb. rugicollis Kirby. 



THERMOXECTES Esch. 

 ornaticollia Lee. 



Acilius orn. Aub'f. 



Therm, irroratus Mels. 

 latecinctus Lee. 



Acilius lat. Lee. 

 basillaris Lee. 



Dytiscus bas. Harris, 



Acilius incisus Aub . 



Therm, nimbatus Mels. 

 marmoratus Aub . 



Colymbetes marm. Hope. 



Hyd. flavomaculatusC'/itfvr. 



Acilius maculatusjl Lee. 



Acilius Leach. 



mediatus Aube. 



Dytiscus med. Say. 



Col. maccullochii Kirby. 

 simplex Lee. 

 latiusculus Lee. 

 abbreviatus Mann. 

 fraternus Lee. 



Dytiscus frat. Harris. 



Ac. semisulcatus Anb'j. 



Eunectes Er. 



sticticus Er. 



Dytiscus stict. Linn. 

 Dyt. griseus Fabr. 



