344 



Leech and Chandler: Coleoptera 



— Spot transverse, nearly entire on sides; elytral punc- 

 tuation somewhat less dense and finer along suture; 



Washington to southern California 



calif ornicus d'Orchymont 1942 



Genus Hydrobius Leach 



Adults 



Length 6.5 to 8 mm. Longitudinal serial punctures of 

 elytra varying from lightly impressed as striae in apical 

 half only, to deeply impressed as striae from apices to basal 

 quarter; interspaces finely uniformly punctate, with some- 

 what serial larger punctures on alternate ones (fig. 13:366); 



Holarctic; northern U.S. and Canada, California 



fuscipea (Linnaeus) 1758 



Key to the California Species of Ametor 



Adults 



1. Hind femora with hydrofuge pubescence on slightly 

 more than basal third; elytra with clearly defined lon- 

 gitudinal rows of punctures, becoming striate apically, 

 lateral rows closer together and more coarsely punc- 

 tured; elytra evenly convex, surface shining or finely 

 scabrous; larger, more strongly convex species, 6-7 

 mm. long; mountains of northern California to Idaho, 

 British Columbia lotus (Horn) 1873 



— Hind femora pubescent adjacent to trochanters and 

 for a short distance along anterior margin; elytra 

 striate, striae punctures usually present in discal 

 area basally, or both punctures and striae effaced 

 except on declivity; elytra subcostate from humeral 

 umbone to apical fourth (that is, along 6th interspace) 

 and at apical fourth of 4th and 5th interspaces, depressed 

 along 7th, 8th, and 9th interspaces, and on 2nd and 3rd 

 interspaces at apical fourth; elytral surface usually 

 strongly scabrous; smaller, flatter species, 4-5.75 mm. 



long; Alaska to Wyoming to California 



scabrosus (Horn) 1873 



Key to the California Species of Crenltls 



Adults 



1. Form oblong, somewhat depressed; mesosternum 



simple, or with a median protuberance; sides of pro- 



notum nearly straight, or weakly arcuate with a broad 



but appreciable hind angle; hind tarsi long, slender 



2 



— Form elliptical, convex; mesosternum with a short 

 transverse groove before mesocoxae, its anterior edge 

 slightly raised; sides of pronotum strongly evenly 

 arcuate, without trace of hind angles, surface shining 

 between punctures; hind tarsi shorter, stouter 4 



2. Pronotum piceous with sides pale, or almost uniformly 

 rufotestaceous; front edge of mentum not margined, 

 usually depressed at middle; mesosternum simple ... 3 



— Head, pronotum, and elytra unicolorous, black with a 

 slight brassy tinge, surface of pronotum alutaceous 

 at sides between punctures; front edge of mentum 

 strongly margined, not depressed at middle; meso- 

 sternum with a low transverse median protuberance; 

 Alaska to California morata (Horn) 1890 



3. Mentum nearly square, almost as long as broad; abdo- 

 men dull, finely, densely, uniformly punctate and 

 pubescent; antennae 9-segmented; California to Oregon 

 dissimilis (Horn) 1873 



— Mentum rectangular, 1/2 again as wide as long; abdomen 

 shining, sparsely pubescent, punctures fine and tending 

 to be in transverse series; antennae 8-segmented; 

 California, Arizona, at high altitudes 



alticola (Fall) 1924 



Smaller species, 1.8-2.2 mm. long; form a short oval, , 

 narrower behind, somewhat egg-shaped, very convex, 

 almost hemispherical; coarse punctures of lateral 

 rows on elytra more widely spaced in the rows, the 

 rows not impressed to simulate striae; British Columbia 



to California rufiventris (Horn) 1873 



Larger species, 2.2-2.75 mm. long; form more elongate- 

 oval, moderately convex; coarse punctures of lateral 

 rows on elytra close-set, the rows evidently impressed, 

 simulating striae; British Columbia to California . . . 

 seriellus (Fall) 1924 



Key to the California Species of Anacaena 



Adults 



1. Head entirely black, or with a vague rufopiceous 

 tinge in front of eyes; pronotum varying from piceous 

 except for lateral margins, to rufopiceous with testa- 

 ceous margins and vague darker rufopiceous markings 

 on disc; body form more narrowly oval, less convex; 

 average size larger, 2-2.7 mm.; Holarctic; Alaska to 

 New York to California, south at least to Los Angeles 



County limbata (Fabricius) 1792 



— Head black with clear testaceous margin in front of 

 each eye; pronotum testaceous to luteous, with piceous 

 discal markings like a broad H with a blotch on central 

 bar; body form more broadly oval, more convex; average 

 size smaller, 1.75-2.5 mm.; southern California, 



northward at least to Siskiyou County 



signaticollis (Fall) 1924 



Key to the California Species of Paracymus 

 Adults 



1. Form short, strongly convex in profile; hind femora 

 finely strigose at least on anterior half; head, pronotum, 

 and elytra strongly punctate, punctures comparable in 

 size to facets of eyes; mesosternal protuberance 

 smaller; antennae 8-segmented; northern America 



subcupreus (Say) 1825 



— Form more elongate, flatly oval in profile; hind 

 femora polished, not strigate; head and pronotum 

 finely punctate to almost impunctate; mesosternal 

 protuberance prominent, almost laminiform; antennae 

 7-segmented 2 



2. Pronotum and elytra with sharply defined pale margin 

 which is broader behind; saline waters, especially 

 coast of southern California elegans (Fall) 1901 



— Pronotum and elytra gradually diffused ly paler at 

 sides; hot springs and mineralized waters, Arizona, 

 southern California including Death Valley 



ellipsis (Fall) 1910 



Key to the California Species of Cymblodyta 

 Adults 



1. Elytra with sutural striae at least in apical half, but 

 elsewhere at most with serial punctures, the rows of 

 which are not impressed as striae; head black 2 



— Elytra with distinct striae, in addition to sutural; 

 head pale in front of eyes; form broad, all rows of 

 punctures entire, including scutellar row; California 

 punctatostriatus (Horn) 1873 



2. Hind femora pubescent in slightly less than basal two- 

 thirds; larger punctures of sublateral group on pronotum 

 hardly half as big as coarse punctures of lateral 

 series of elytra; California to British Columbia 



dorsalis (Motschulsky) 1859 



— Hind femora pubescent in basal three-fourths; punctures 

 of sublateral group on pronotum as large as or larger 

 than those of lateral series of elytra 3 



