260 CALIFORNIA ACADEMY OF SCIENCES. 



Specimens from the Sierra Madre Mountains (Los 

 Angeles County) and Lake Tahoe. 



Described from two examples, in which no sexual 

 characters were observed. The peculiar structure of the 

 prothorax will at once distinguish the present species 

 from any previously described. Neither nucleus nor 

 constrictus can properly be referred to any of the 

 numerous genera lately proposed by Casey, and for a 

 variety of reasons it seems best for the present to use 

 the old name Xylophilus. 



79. Rhynchites aeratoides, sp. nov. 



This species is almost the exact counterpart of It. ceratus, from which it 

 seems constantly to differ in the more closely punctate head, broader front, 

 more prominent eyes, and the presence in the male of a longitudinal median 

 impressed line on the first three ventral segments. 



R. ceratus is somewhat variable in the cephalic char- 

 acters mentioned, and while the writer has seen no 

 specimens that approach the Californian form very 

 closely in this respect, there would be some hesitancy in 

 separating them were it not for the peculiar abdominal 

 characters of the males above mentioned, the detection 

 of which is due to the observation of Mr. Frederick 

 Blanchard, to whom examples were sent for comparison 

 with the eastern specimens in his cabinet. 



R. ceratoides occurs at Redondo (on Eriogonum cine- 

 reum), Pomona and Pasadena, from March to June. 



80. Cleonus pacificus, sp. nov. 



Robust, parallel, clothed with moderately dense, recumbent, squami- 

 form, cinereous pubescence; the disk of the thorax, except two dorsal 

 vittse, and the sutural interval of the elytra, glabrous. Beak stout, some- 

 what dilated at tip, sides and tip glabrous, carinate above in basal two- 

 thirds, not very coarsely or deeply punctate, frontal impression feeble. 

 Prothorax a trifle wider than long, sides parallel in basal half, thence mod- 

 erately rounded and convergent, without apical constriction; basal lobe 



