52 CALIFORNIA ACADEMY OF SCIENCES. 



Cnemidotus. — C. callosus and G. simp/ex are both com- 

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

 both most frequently in alga^ occurring on stagnant 

 pools in August and September. 



DYTISCID^. 



Laccophilus. — L. decipiens, everywhere plentiful: ter- 

 'minalis is moderately common, and ^--^ineatus 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. laiissima, San Diego, Santa Bar- 

 bara; not common. 



Bidessus. — B. cinctellus, "So. Cal." (ites/e Horn), prob- 

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

 common species in adjacent parts of Arizona: pidodes^ 

 generally scarce; I have seen specimens from Ventura 

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

 Mountains: ajffinis, occurs commonly in most localities; 

 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., 2n(l Ser., Vol. IV, 1894, p. 313. 



