240 MEMOIRS ON THE COLEOPTERA 



the base; prothorax strongly transverse, four-fifths as wide as the 

 elytra, the median teeth very stout, rapidly finely acuminate and 

 notably reflexed or hamate; punctures numerous, fine but deep; 

 scutellum broadly angulate at tip; elytra two-thirds longer than 

 wide, finely but strongly, rather sparsely punctate, the two inner 

 raised lines feeble; sides of the apical abdominal sinus (cf ) tumid on 

 the surface; tarsi unusually stout. Length (cf) 47.0 mm.; width 

 18.2 mm.; length and width of prothorax 6.2X15.0 mm.; width of 

 head 8.2 mm. Texas (El Paso), Dunn. [P. curvatus Lee., Col. 

 of Kansas and East. N. M., 1859, p. 19, Santa Fe] . .curvatus Lee. 



Head and prothorax smaller, the latter similarly very transverse 17 



17 Lateral teeth of the prothorax long, very slender and spiculiform. 

 Body large, very stout, rufo-castaneous, the head and prothorax 

 piceous-black, convex, shining; head moderate, nearly as in curvatus; 

 antennae (9) slender, three-fifths as long as the body, the last 

 joint more than three times as long as wide, distinctly longer than 

 the preceding, the inner face beveled at tip and with a small pit at 

 the summit of the bevel; eyes separated by three-fourths their width; 

 prothorax more convex than in the others of this group and with 

 more numerous and stronger punctures, the long and very slender 

 anterior and middle teeth not or scarcely at all reflexed; scutellum 

 large, very obtuse; elytra three-fifths longer than wide, a third wider 

 than the prothorax, tapering but feebly, the apices broadly rounded, 

 the marginal impression just behind the humeri unusually developed, 

 the two inner raised lines very feeble; punctures fine and every- 

 where sparse; tarsi rather slender, the canaliculation deep and dis- 

 tinct on the two posterior pairs. Length (9 ) 47-O mm.; width 20.0 

 mm.; length and width of prothorax (as here uniformly measured 

 from the apices of the middle teeth) 6.6X15.7 mm.; width of head 

 8.2 mm. Arizona (Grand Canon of the Colorado), T. Mitchell 



Prudden spiculosus n. sp. 



Lateral teeth acute and finely pointed but shorter and not spiculiform. . 18 

 18 Form moderately stout, convex, rather shining, piceous-black to 

 dark castaneous, the head (cf ) nearly as in curvatus but not quite 

 so large, or ( 9 ) notably small, the eyes nearly as in that species, the 

 antennae (cf ) not quite so stout basally, the last joint evenly elongate- 

 oval, three times as long as wide and very much shorter than the 

 preceding, or ( 9 ) unusually slender, but feebly serrate distally, 

 with the last joint as in the male though only a little more than 

 twice as long as wide, unmodified on the inner face and much shorter 

 than the preceding; prothorax nearly as in spiculosus in general 

 form, rather strongly punctate; scutellum very obtuse; elytra two- 

 thirds (cf ) to four-fifths (9 ) longer than wide, the punctures rather 

 small and sparse but strong and conspicuously impressed; tarsi 

 rather slender, canaliculate as in spiculosus; surface at the ends of 

 the apical abdominal sinus (cf ) not tumid as in curvatus. Length 

 (cf) 35-0-39-5. (9) 37-Q-43-Q mm.; width (cf) 14.5-16.2, (9) 

 13.8-17.0 mm.; length and width of prothorax (cf, 9) 5.5X10.0 

 mm.; width of head (cf) 6.8-7.5, (9) 6.0-6.8 mm. Colorado 

 (Boulder Co.). Abundant censors n. sp. 



