18 



GYRINIDAE — HYDROPHILIDAE. 



Dytiscus Linn. 



confluens Say. 



ooligbukii Kirby. 



var. franklinii Kirby. 

 a. ventralis Motsch. 

 fuscostriatus Motsch. 

 anxius Mann. 

 parvulus Mann. 

 marginicollis Lpc. 



var. albionicus Motsch. 

 cordieri Aube'. 

 sublimbatus Lee. 

 fasciventris Say. 



carolinus Aub'e. 

 harrisii Kirby. 

 verticalis Say. 

 hybridus Aube. 



compar Mels. 



Cyfoister Curtis. 



fimbriolatus Mels. 



Dytiscus fiuib. Say. 



Cyb. dissimilis Aube. 

 ellipticus Lee. 

 explanatus Lee. 



GYRINIDAE. 



Gyriniis Linn. 



sayi Aube. 

 aubei Lee. 



analist. Aube. 

 borealis Aube. 

 impressicollis Kirby. 

 opacus Sahlberg. 

 picipes Aube. 

 affinis Aube'. 

 plicifer Lee. 

 consobrinus Lee. 

 fuscipes Motsch. 

 marginiventris Motsch. 

 limbatus Say. 

 conformis Aube. 

 lateralis Aub f . 

 ventralis Kirby. 

 analis Say. 

 dichrous Mels. 

 rninutus Linn. 1 



Diiieutus McLeay. 



sublineatus Aube. 

 O integer Lee. 



vittatus Aube. 



Gyrinus vitt. Germ. 

 emarginatus White. 

 j Gyrinus em. Say. 



D. americanusj Aub'e. 

 opacus Mels. 

 americanus White. 



Gyrinus am. Linn. 



D. assimilis Aube. 



Cyclinus assimilis Kirby. 

 discolor Aube. 

 labratus Mels. 



Gyretes Brulle. 



sinuatus Lee. 

 compressus Lee. n. sp. 



HYDROPHILIDAE. 



HELOPHORINI. 

 Helopliorus Fabr. 



oblongus Lee. 

 lacustris Lee. 

 obscurus Lee. 

 nitidulus Lee. 

 linearis Lee. 

 alternatus Lee. 

 ventralis Motsch. 



an seq. gens? 

 lineatus Say. 

 obsoletesulcatusil/W.— 

 granulans Motsch. — 

 angustulus Mann. 

 inquinatus Mann. 



var. consimilis Mann. 



an a seq. diff. ? 

 auricollis Esch. — 

 scaber Lee. 



Ilydroclius Germ. 



scabratus Muis. 



gibbosus Mels. 

 callosus Lee. 

 squamifer Lee. 

 rugosus MuJs. 



grandis Motsch. 

 inaequalis Lee. 

 excavatus Lee. 

 rufipes Mels. 

 foveatus Hold. 

 variolatus Lee. 

 vagus Lee. 

 simplex Lee. 



OclitheMus Leach. 



puncticollis Lee. 

 interruptus Lee. 

 lineatus Lee. 

 cribricollis Lee. 

 nitidus Lee. 

 fossatus Lee. 

 holmbergi Maklin. 



Hydraena Kug. 



pensylvanica Kies. 

 punctata Lee. 

 marginicollis Kies. 



HYDROPHILINI. 



Hydrophilus Geoffr. 



ovalis Ziegl. 

 triangularis Say. 2 



tristis Motsch. 



Stethoxus subsulcatus Lee 



§ Tropistebkus Sol. 



lateralis Llerbst. 



?lateralis Fabr. 



nimbatus Say. 

 limbalis Lee. 



Trop. marginatus Motsch. 



var. T. humeralis Motsch. 

 californicus Lee. 

 sublaevis Lee. 

 glaber Herbst. 

 mixtus Lee. 

 ellipticus Lee. 



Trop. affinis Motsch. 

 striolatus Lee. 



Hydrocliaris Latr. 



glaucus Lee. 

 substriatus Lee. 

 obtusatus Lee. 



Hydrophilus ob. Say. 

 castus Lee. 



Hydrophilus cast. Say. 



HYDROBIINI. 



Berosus Leach. 



punctatissimus Lee. 

 maculosus Mann. — 



tesselatus Motsch. 

 miles Lee. 

 pugnax Lee. n. sp. 

 aculeatus Lee. 

 subsignatus Lee. 



The European G. aeneus is, according to Kirby, found in North America. 



H. lugubris Motsch. is an Arabian, and not a Californian, species: vide Bull. Mosc. 1860. 



