COI.EOPTERA OF BAJA CALIFORNIA. 387 



Trichodesma sordida n. sp. 



Cylindrical, oblong, more than twice as long as wide, 

 black, head and thorax with dirty yellow pubescence, 

 elytra with a band of same along the base, a very narrow 

 sinuous band at middle and an irregular apical space of 

 same color. Antennge black. Head black, punctuation 

 concealed. Thorax broader than long, sides arcuate in 

 front, slightly sinuate in front of the hind angles, the lat- 

 ter distinct, disc gibbous behind the middle, a slight sul- 

 cus from the apical margin to the summit of the gibbos- 

 ity, surface distinctly granulate and not densely clothed 

 with dirty yellowish pubescence and with intermixed 

 short, black erect hairs, but without brush at the summit 

 of the gibbosity. Elytra but little wider than the thorax, 

 the surface with irregular striae of coarse, deep, not closely 

 placed punctures and clothed with velvety black pile 

 arranged in quite small spots, a dirty yellow band com- 

 posed of spots across the base, a sinuous indistinct band 

 at middle and a space near the apex of similar pubes- 

 cence. Body beneath black, subopaque, surface gran- 

 ular dashed with recumbent, dirty yellow pubescence. 

 Length, .30 inch; 7.5 mm. 



This species is similar in form to sellata, being more 

 than twice as long as broad, differing in having the sides 

 of the thorax less sinuate behind the middle. It differs 

 from all our species in having no brush-like tufts at the 

 summit of the gibbosity of the thorax. 



One specimen, Texas; special locality unknown. 



Trichodesma cristata Casey, Ann. N. Y. Acad., 

 V, p. 323- 



Form of gibbosa, but shorter and slightly more robust, 

 piceous black, feebly shining, sides of thorax and base of 

 elytra near the humeri densely clothed with web-like 



