450 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



The salient differences between P. californicus and P. pallidus 

 have been discussed under the latter species. In one male specimen 

 of P. californicus from Lake Talioe, Calif. (USNM), there are very 

 feeble, blunt indications of frontal tubercles. These could perhaps 

 be construed as frontal tubercles by one who is unfamiliar with the 

 development of these structures in males of P. pallidus. Otherwise 

 this character is quite constant and useful. 



The only ecological data available is that accompanying a male 

 and female from Shasta County, Calif. (UCal) which were taken 

 from under bark of mountain hemlock, Tsuga mertensiana. 



Type.— ANSP 3991. Labeled "Cala", stated as Fort Crook 

 by Horn in the original description. 



Specimens examined. — From the following localities, 35: 



United States: California (Bass Lake, Kings Creek Meadow, Lake Tahoe, 

 Miami, Sugar Pine, Tallac, Truckee). 



Literature Cited 



Back, E. A., and Cotton, Richard Thomas 



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 Bates, Frederick 



1873a. Notes on Heteromera, and descriptions of new genera and species 

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1873b. Notes on Heteromera, and descriptions of new genera and species 

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1873c. Notes on Heteromera, and descriptions of new genera and species 

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 Baudi di Selve, Flaminio 



1876a. Europaeae et circummediterraneae faunae tenebrionidum specierum, 

 quae comes Dejean in suo catalogo, editio 3*, consignavit, ex 

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 Ent. Zeitschr., vol. 20, pp. 225-267. [Pars tertia.] 

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 Italiana, vol. 8, pp. 98-119. 

 Blackwelder, Richard Eliot 



1945. Checklist of the coleopterous insects of Mexico, Central America, 

 the West Indies, and South America, pt. 3. U.S. Nat. Mus. 

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 Blaisdell, Frank Ellsworth 



1909. A monographic revision of the Coleoptera belonging to the tene- 

 brionide tribe Eleodini inhabiting the United States, Lower Cal- 

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1923. Expedition of the California Academy of Sciences to the Gulf of 



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