54 CALIFORNIA ACADEMY OF SCIENCES. 



San Diego; not common: obsuletus, San Diego (Le Conte); 

 lecontei, rather common, various localities. The follow- 

 ing species are found farther north: intersectui^ , hrevicol- 

 lis, confertus, strigulosas, tristis (Lake Tahoe), suturalis, 

 erichsoni. 



Rhantus. — R. blnotatus, common generally: anisony- 

 dius, much rarer, Pomona: jiavogriseus and sinuatus are 

 reported from the State, but I have not seen specimens 

 from the south. 



Colymbetes. — C. strigatus, rare; a single specimen 

 taken at San Bernardino in April: sculptilis is recorded 

 from the State by Crotch: seininiger occurs in the north- 

 east. 



Eretes. — E. stidicu-'^ is a cosmopolitan species which 

 has occurred once at Soldiers' Home (Van Dyke). 



Hydaticus. — H. stagnalis is recorded from "Cal." 

 (Horn, " The Coleoptera of Baja California"*). 



Dytiscus. — B. marglnicolUs, scarce; several specimens 

 taken by Mr. Daggett in Bear Valley, elevation 7,000 

 feet, June; one example taken by myself at Santa 

 Monica. 



Thermonectes. — T. basilar it^ var. inter medius, one 

 example, Pomona, September: inarmoratus, near San 

 Diego (Fuchs). 



Cybister. — C. explanatns, not rare, many localities; 

 ellipiicus, Colorado Kiver. Both species are frequently 

 attracted by electric lights. 



GYRINID.E. 



This family is very poorly represented in Southern 

 California. 



* Proc. Cal, Acad. Sci.. 2n(l Ser., Vol. IV, 1894. p. 314, 



