COLEOPTERA OF SOUTHERN CALIFORNIA. 143 



foot-hills and at moderate altitudes in the Sierras. The 

 larva lives in decaying roots of live-oak (Quercus agri- 

 folia). 



Trogosma. — T. hannsii is not uncommon in the mid- 

 dle Sierras. The larva is reported as depredating on 

 Pinus contorta. T. pilosicornis is described from Mt. 

 Diablo, near San Francisco. 



Asemum. — Specimens referred to nitidwrn have been 

 taken at an altitude of 6,000 feet in the Sierras in 

 June; larva has been found in decayed Pinus insignis 

 (Rivers): atrum has been taken in the middle Sierras 

 and on Mt. Whitney, at 11,000 feet altitude (Daggett). 



Tetropium. — T. velutinum, labeled " Cal.," must be 

 northern. 



Decentrus. — D. bluthneri, redwood forests, north of 

 San Francisco. 



Hylotrupes. — H. amethystinus, San Bernardino Moun- 

 tains, Bear Valley; rare (Van Dyke): ligneus, common; 

 depredates on pine. A nearly black variety has been 

 taken on wood-piles in the middle Sierras (Placer 

 County) by Mr. Van Dyke, who writes that this melanotic 

 form is found only on fir wood-piles that are situated in 

 the forests and are more or less in the shade, while the 

 type-form occurs on pine and spruce wood-piles in 

 sunny situations. 



Phymatodes. — One example of blandus was beaten from 

 pine in the San Bernardino Mountains: obscurus, San 

 Diego, on live-oak from the branches of which it has 

 been bred by Dr. F. E. Blaisdell: decussatus, one exam- 

 ple beaten from Quercus engelmanni at Pasadena, May 

 31: juglandis, Los Angeles County; depredates on Juglans 



