386 CALIFORNIA ACADEMY OF SCIENCES. 



punctured. Elytra vaguely quadri-costate, the pubes- 

 cence abraded from their summits, surface densely finely 

 punctured. Body beneath as above. Length, .36 inch; 

 9 mm. 



The specimen before me is probably a male, the last 

 ventral is very obtuse with a shallow emargination extend- 

 ing from side to side. 



Collected in southwestern Texas, near the Rio Grande. 



Trichodesma sellata n. sp. 



Cylindrical, rather more oblong than gihbosa, piceous 

 black, densely clothed above with a white pubescence, 

 dense, like a spider-web, a large saddle-shaped space 

 common to both elytra of brownish pubescence. An- 

 tennae ferruginous. Head densely pubescent. Thorax 

 broader than long, sides arcuate in front, suddenly sin- 

 uately narrowing at the middle, hind angles distinct, disc 

 strongly gibbous, an impressed line from the apical mar- 

 gin to the summit of the gibbosity, surface coarsely punc- 

 tured, the pubescence forming denser reticulations, the 

 summit of the gibbosity with short, stiff, brown hair. 

 Elytra densely pubescent, concealing the sculpture, in 

 great part ashy white and web-like with a large saddle- 

 shaped space of brown pubescence and with short erect 

 hairs sparsely placed similar in color to the surface from 

 which they arise, also two arcuate series of erect brown- 

 black hairs forming brushes, the one series one-third 

 from base, the second one-third from apex, each series 

 composed of three brushes on each elytra. Body be- 

 neath densely pubescent, the pubescence simple and not 

 web-like. Length, ,29 inch; 7.5 mm. 



This species differs from every other known to me by 

 the form of the thorax. The vestiture is remarkable. 



One specimen, El Taste. 



