COLEOPTERA OF SOUTHERN CALIFORNIA. 201 



Cossonus. C. crenatus is abundant under pine bark, 

 in the southern Sierras: piniphilus is found in similar 

 situations farther north; my specimens are from the 

 middle regions. 



Macrorhyncholus. M. protractus is common in the 

 foot-hills of the Sierra Madre Mountains; the larva lives 

 in the flower stalks of Yucca whipplei. 



Elassoptes. E. marinus is found on the sea beach; 

 Santa Monica and San Pedro. 



Rhyncholus. R. dorsalis, San Diego: angularis, Col- 

 orado Desert, under willow bark: oregonensis, San 

 Bernardino Mountains: R. spretus, San Bernardino 

 Mountains, on freshly cut alder. Casey has described 

 pattens from the vicinity of San Francisco, and dil- 

 atatus from "Cal." Wollaston has described from Cal- 

 ifornia, cylindricollis , calif ornicus , and protensus, all of 

 which are unknown to American entomologists; but 

 there is doubtless some synonymy involved in Casey's 

 recent descriptions. 



SCOLYTID.E. 



Monarthrum. M. scutellare and M. dentigerum have 

 both been taken in March from burrows extending into 

 the solid wood of live-oak; the latter species has been 

 taken on the wing from April to June. 



Gnathotrichus. G. retusus is found under pine bark, 

 San Bernardino Mountains, August. 



Pityophthorus. P. pubipennis affects alders; swarms 

 have been seen flying in August in the San Bernardino 

 Mountains: carinulatus, confinis, and digestus were all 

 taken by Crotch in the Mojave region. The first-named 

 species as well as nitidulus and puncticollis occur in the 



