388 CALIFORNIA ACADEMY OF SCIENCES. 



whitish pubescence. Antenna' brownish. Head piceous, 

 sparsely granulate and clothed with ferruginous pubes- 

 cence less abundant at middle. Thorax one-half wider 

 than long, sides regularly arcuately narrowing to base 

 without sinuation, the hind angles obliterated, disc gib- 

 bous at middle, surface rather closely granulate, densely 

 clothed at sides with whitish web-like pubescence, the 

 middle third nearly naked except the brushes of black 

 hair at the summit of the gibbosity. Elytra wider than 

 the thorax, with coarse punctures irregularly arranged in 

 strife with small patches of granules irregularly placed, 

 more evident at base, surface indeiinitel}^ and sparsely 

 clothed with short brownish pubescence with small whitish 

 patches irregularly placed, small tufts of short erect hair 

 form two series, the first of three patches beginning at 

 the umbone extending obliquely backward to the suture, 

 the second series one-third from apex, strongly arcuate 

 on each elytron of four patches each side. Body beneath 

 not densely granulate, clothed with short yellowish pubes- 

 cence. Length, .24 inch; 6 mm. 



This species is known by its form and the compara- 

 tively scanty vestiture of the elytra. The above descrip- 

 tion was written under the impression that the species 

 was new, as many important points were passed in the 

 description by Capt, Casey. 



Oregon, northern California, Santa Cruz and Alameda. 



The species of Trichodesma of Boreal America may 

 be separated as follows: 



Form fully twice as long as wide; sides of thorax sinuate iu front of hind 

 angles; last three joints of antennte together much longer than the 

 preceding joints. 

 Sides of thorax abruptly aud deeply sinuate; vestiture of surface dense. 



fsellata. 

 Sides of thorax feebly sinuate; vestiture sparse. sordida. 



