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. harrisii 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 nitidum 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 



