COLEOPTERA OF SOUTHERN CALIFORNIA. 201 



Cossonus. — C. crenatus is abundant under pine bark, 

 in the southern Sierras: piniphitus is found in similar 

 situations farther north; my specimens are from the 

 middle regions. 



Macrorhyncholus. — M. protructus is common in the 

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

 in the flower stalks of Yucca ivhipplei. 



Elassoptes. — E. marinun is found on the sea beach; 

 Santa Monica and San Pedro. 



Rhyncholus. — R. dorsalis, San Diego: angidaris, Col- 

 orado Desert, under willow bark: oregonensis, San 

 Bernardino Mountains: R. spretus, San Bernardino 

 Mountains, on freshly cut alder. Casey has described 

 pallens from the vicinity of San Francisco, and dil- 

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

 ifornia, cylincb'icollis , californiciis, and protensus, all of 

 which are unknown to American entomologists; but 

 there is doubtless some synonymy involved in Casey's 

 recent descriptions. 



SCOLYTID.^. 



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. retiisu.s is found under pine bark, 

 San Bernardino Mountains, August. 



Pityophthorus. — P. p)uhipennw aiBfects alders; swarms 

 have been seen flying in August in the San Bernardino 

 Mountains: carinulatus, conjinis, and digestus were all 

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

 species as well as nitidulus and puncticollis occur in the 



