363 

 Leech and Chandler: Coleoptera 



2. Elytra with 1 sublateral carina; form with nearly 

 parallel sides, elytra only slightly wider than pronotum; 

 sculpturing of pronotum reduced; size smaller (1.4*. 5 

 mm.)', from warm springs in northwest corner of Nevada 



thermarum (Darlington) 1928 



— Elytra with 2 sublateral carina; sides less parallel, 

 elytra distinctly wider than pronotum; size, larger 

 (1.6 x .5mm.); from warm spring in southeastern Nevada 

 moapus La Rivers 1949 



Key to California Species of Cleptelmls 



Adults 



1. Elytra black with humeral and subapical red spot; 

 length 1.8-2.2 mm.; British Columbia, Montana, Utah, 

 northern California, in rapid streams on roots and moss 



ornata (Schaeffer) 19 11 



— Elytra black without spots except humeral angle paler, 

 never distinctly red; length 1.7-2.1 mm.; California 

 to South Dakota in rapid streams up to 6,000 feet 



elevation, on roots and moss 



addenda (Fall) 1907 



anatomy. Trans. Roy. Ent. Boo. London, 80:183-184, 

 105 text figs., 1 pi. 

 1940. A monographic revision of the Mexican watei 

 beetles of the farailj Elmidaa. Novlt. Zool., 12:1 



101 text figs. 

 SANDERSON, M. W. 



1938. A monographic revision of the North American 

 species of Stenelmia (Dryopidae: Coleoptera). Univ. 

 Kansas Sci. Bull., 25:6:3*5-717, incl. pis. No. lxxx, 

 lxxxi. 



1953. A revision of the Nearctic genera of Elmidae 

 (Coleoptera) (Part I). Jour. Kansas Ent. Soc, 26: 

 148-163, incl. 3 pis. 



1954. A revision of the Nearctic Genera of Elmidae 

 (Coleoptera) (Part II). Jour. Kansas Ent. Soc, 27:1-13, 

 incl. 1 pi. 



WEST, L. S. 



1929. A preliminary study of larval structures in the 

 Dryopidae. Ann. Ent. Soc. Amer.. 22:691-727, incl. 

 6 pis. 



Family LIMNICHIDAE 



1 



Key to California Species of Heterlimnius 



Adults 



Antennae 1 1-segmented; length 2-2.5 mm.; black; 

 British Columbia to northern California, in rapid 



streams koebelei Martin 1927 



Antennae 10-segmented; length 2.6-2.9 mm.; brown, 

 black, sometimes base of elytra rufous; British Colum- 

 bia, California, from rapid streams in northern Sierra 

 Nevada above 6,000 feet .. .corpulentus (LeConte) 1874 



Key to California Species of Optioservus 



Adults 



Elytra black, without trace of pale area at the humeral 

 angles; length 2-2.5 mm.; southern California and 



Arizona divergens (LeConte) 1874 



Elytra never entirely black 2 



Dull colored, elytra dull black to rufous, spots less 

 conspicuous, elytra densely micropunctate on intervals, 

 hairs on elytra and pronotum more conspicuous giving 

 a grizzled appearance; length 2.2-2.5 mm.; west central 



California canus Chandler 1953 



Elytra shining black, microsculpture and hairs not con- 

 spicuous, not giving a grizzled appearance; humeral 

 and subapical red spots larger and more distinct .... 3 

 Form broader, less parallel-sided, elytra noticeably 

 wider than prothorax, elytral striae slightly impressed, 

 humeral spot larger usually reaching 2nd striae; length 

 1.8-2.2 mm.; Sierra Nevada and northeastern California 



up to 6,000 feet quadrimaculatus (Horn) 1870 



Form more elongate, elytra scarcely wider than pro- 

 thorax, sides nearly parallel, striae not impressed; 

 humeral spot reaching only to 3rd striae; north Coastal 

 California, Oregon seriatus (LeConte) 1874 



REFERENCES 



HATCH, M. H. 



1938. Two new species of Helmidae from a warm spring 

 in Montana. Ent. News, 49:16-19, 2 text figs. 



HINTON, H. E. 



1935. Notes on the Dryopoidea (Col.). Sty lops, 4:169-179, 

 7 text figs. 



1939. An inquiry into the natural classification of the 

 Dryopoidea, based partly on a study of their internal 



3 



These small beetles are found along the margins of 

 streams. They are clothed with dense, short hairs, 

 each hair arising from a puncture (fig. 13:57o). In 

 some species these punctures are enlarged, giving a 

 honeycomb appearance. Occasionally the body has 

 a checkerboard metallic luster. The Limnichinae are 



Fig, 13:57. Limnichidae. a, Lutrochus gigas, adult (Peruvion 

 sp.); b, L. gigas, antenna; c, L. erichson/anus, side view of 

 prosternum and hypomero of adult, hypomeral ridge showing at 

 left (Mexican so.) (Hinton, 1939). 



