1975 ] Lawrence & Stephan — Cerylonidae 163 
in the male, and the less flattened form. Cerylon distans is larger, 
with more widely separated mesocoxae, while C. conditum is usually 
larger and more elongate, with a notched clypeus in the male. In 
California, this species is easily distinguished from C. calif ornicum 
by the much smaller size, less distinct vestiture, and less robust form. 
Cerylon unicolor is the only species in which there appears to be 
pronounced sexual dimorphism in prothoracic shape, the sides in the 
female being parallel basally and convergent apically, while those in 
the male are slightly divergent at the base (figs. 18-19). 
Distribution. Northern and eastern North America and the Pa- 
cific Coast. Extending from southern British Columbia, south 
through Washington, Oregon, Idaho, and California as far as Los 
Angeles County on the coast and Fresno County in the Sierra 
Nevada; east across southern Canada and the northern United States 
to southern Ontario and Maine; south on the Atlantic Coast to 
northern Florida, and west to the 100th meridian. 
Biology. Adults collected under the bark of Cary a, Fagus, Lirio- 
dendron , Picea, Pinus , Platanus , Populus, Liquidambar , Salix, and 
Tsuga. Also in rotten logs, leaf mold, at sap, in an ear of corn, at 
light, at malt traps, and in various fungi, including Phellinus gilvus 
and Bjerkandera adusta. Larvae found under bark of hardwood 
logs in Arkansas. 
Literature Cited 
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Beck, L. V. 1817 Beitrage zur baierischen Insektenfaune, oder Beschrei- 
bung und Abbildung neuentdeckter Kafer. . . . Augsburg, Wolff, 45 pp. 
Besuchet, C. 1972 Les Coleopteres Aculagnathides. Revue Suisse Zool., 
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Boving, A. G. and F. C. Craichead 1931 An illustrated synopsis of the 
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Casey, T. L. 1890 Coleopterological notices. II. Ann. New York Acad. 
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1895 Coleopterological notices. VI. Ann. New York Acad. 
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1897 Coleopterological notices. VII. Ann. New York Acad. 
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Crowson, R. A. 1955 The Natural Classification of the Families of 
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