COLEOPTERA OF SOUTHERN CALIFORNIA. 53 



Hygrotus. — H. hydropicits, rather rare, Pomona and 

 San Diego. 



Coelambus. — G. medialis, rather common everywhere: 

 fraternus, Colorado River: pedalis, not common, River- 

 side and Pomona, May and June: lutescens is quite com- 

 mon in middle California, — San Francisco, San Jose, 

 Sacramento: impressopunctatus, one specimen. Lake 

 Tahoe (Fenyes). 



Deronectes. — D. griseostriatus, not common, Redondo, 

 December and February: striatellus, exceedingly abun- 

 dant everywhere. 



Hydroporus. — H. addendus, rare at Pomona and Ojai 

 Valley, more common a little further north: fortis, 

 rare, San Diego; subpubescens , not common, though 

 widely diffused: axillaris, southeastern region, probably 

 Yuma: vilis and latebrosus, common in most localities. 

 The following species are also reported from the State 

 and some may possibly occur within our limits, though 

 the species of the genus are as a rule more northern in 

 habitat: eximius, rivalis {=saninarki Sahib, according 

 to Fauvel), terminalis and hardyi. Mr. Fuchs has a 

 record of H. fiinereus from San Diego. This is quite 

 likely correct, but needs verification. 



Coptotomus. — C interrogatus is common at Needles in 

 August (Wickham). 



Hydrotrupes. — H. palpalis is one of our rarest species, 

 occurring in the mountain streams of the southern 

 Sierras. 



Ilybiosoma. — /. regularis is plentiful everywhere. 



Agabinus. — A. glabrellus, rather scarce as a rule, but 

 once found in some numbers in a small spring on Cata- 

 lina Island. 



Agabus. — A. lugens, abundant everywhere- lineeUus, 

 very rare, Pomona, April and May: niorosus, Pomona, 



