352 



MEMOIRS ON THE COLEOPTERA 



darker cloud adjoining and intensifying the hind margin of the 

 large lateral white spot; otherwise there is a rather close resem- 

 blance, except that tessellatus is decidedly smaller, about 20 mm. 

 in length. 



Oncideres Serv. 



The described and undescribed species of this genus, which are 

 represented in my cabinet, and apparently including all the known 

 forms, excepting pustulatus Lee., which is exceedingly rare in 

 collections, may be identified very readily by the following char- 

 acters : 



Pronotum with three shining tubercles in transverse line medially. 

 Body rather narrow, elongate, cylindric, black, strongly shining 

 where denuded, clothed with short cinereous vestiture which, on 

 the elytra, forms feeble maculations but condensed in a transverse 

 fascia occupying much less than a third the total length, from near 

 basal third to slightly behind the middle, and numerous small spots 

 of ferruginous color, only feebly subserial in arrangement; antennae 

 (cf ) one-half longer than the body; prothorax narrowed at base, 

 with a rather strong spiniform tooth laterally at basal third, some- 

 what strongly but sparsely punctate, the vestiture not dense, coarse; 

 elytra parallel, together rounded at tip, strongly, not very closely 

 punctate, the punctures becoming closer, coarser and evidently 

 though not strongly graniferous basally; antennae slender, pale, 

 becoming black basally, the scape with sparse decumbent ashy hairs 

 and with the usual fringe of longer hairs beneath. Length 12.5-14.0 

 mm. ; width 3.8-4.8 mm. Texas (El Paso) and Arizona (Cochise Co.) . 



trinodatus n. sp. 



Pronotum without three denuded tubercles 2 



2 Prothorax with a moderate but acute denticle at each side near basal 

 third, much narrower at base than at apex; elytral punctures at 

 base not or scarcely at all graniferous; species of the southwestern 

 faunal regions 3 



Prothorax not or moderately narrowed at base and never with more 

 than a slight vestige of lateral spines or prominences; species of the 

 Atlantic faunal region 5 



3 Body very slender, cylindric, the entire elytra densely clothed with 

 cinereous pubescence, becoming abruptly bright ferruginous in 

 clusters separated by sparser umber-brown hairs in basal sixth 

 laterally and thence arcuately oblique to the scutellum, and with 

 a rounded brown lateral spot at three-fifths, the small spots of denser 

 pubescence white, except a few posteriorly, which are ferruginous. 

 Length (cf 9 ) 1 1.5-13.0 mm.; width 3.4-4.2 mm. Arizona (Cochise 

 Co.) quercus Skin. 



Body stouter, the denser cinereous pubescence of the elytra confined to a 

 broad fascia, the small spots pale yellowish and not becoming paler 

 in the cinereous band 4 



