52 CALIFORNIA ACADEMY OF SCIENCES. 



Cnemidotus. C. callosus and G. simplex are both com- 

 mon and are to be found at all seasons. I have taken 

 both most frequently in algse occurring on stagnant 

 pools in August and September. 



DYTISCID.E. 



Laccophilus. L. decipiens, everywhere plentiful: ter* 

 minalisis moderately common, and If-lineatus less so, at 

 Yuma: mexicanus has occurred twice at Pomona: fas- 

 ciatus is said by Crotch to occur in California, but I have 

 not seen specimens. 



Hydrovatus. To H. brevipes is referred a single ex- 

 ample taken at Long Beach. 



Desmopachria. D. latissima, San Diego, Santa Bar-. 

 bara; not common. 



Bidessus. B. cinctellus, "So. Cal." (teste Horn), prob- 

 ably from the desert region, as it is known to be a 

 common species in adjacent parts of Arizona: pictodes> 

 generally scarce; I have seen specimens from Ventura 

 only; an allied form is not rare in the San Bernardino 

 Mountains: affinis, occurs commonly in most localities j 

 the form taken west of the mountains is the dark variety 

 to which Le Conte gave the name obscurellus ; specimens 

 from east of the mountains are more or less distinctly 

 vittate: subtilis, to this should probably be referred the 

 commonest species in maritime Southern California, 

 though few specimens are as distinctly marked as the 

 Le Conte type: amandus, reported from "So. Cal." by 

 Horn ("The Coleoptera of Baja California ")* without 

 definite locality; it was described from the Gila River, 

 and should occur along the Colorado; in the type the 

 sutural stria is very feeble, but I suspect that this may 

 be merely an individual variation. 



*Proc. Cal. Acad. Sci., 2nd Ser., Vol. IV, 1894, p. 313. 



