26 MEMOIRS ON THE COLEOPTERA 



rudimentary but evident. Length (c? 9 ) 10.0-10.8 mm.; width 

 6.0-6.7 mm. Arizona. Four examples nimbosa n. sp. 



Body much less stout to notably slender, the elytra always very pale, 

 having thin integuments, the elytral suture, side margin or humeral 

 callus sometimes dark 9 



9 Prothorax very short and transverse, always evidently more than twice 

 as wide as the median length 10 



Prothorax much less transverse, never quite twice as wide as the median 

 length n 



10 Body oblong, subparallel, barely at all inflated posteriorly, pale, the 

 pronotum with the dark area much comminuted and sometimes 

 wanting, very nubilous; elytra with the suture and humeral callus 

 alone darker to nearly black; head (9 ) but little more than half as 

 wide as the prothorax, with short and very transverse, almost semi- 

 elliptical clypeus, which is closely but rather discretely punctate and 

 with moderately reflexed edges; front sculptured like the clypeus; 

 elsewhere minutely and remotely punctulate; eyes very moderate, 

 separated by fully three times their width; prothorax very transverse, 

 almost as wide as the elytra, much more than twice as wide as the 

 median length, the apex broadly, deeply sinuate, with prominent 

 acute angles from above, right when viewed sublaterally ; base with 

 a fine but entire bead; surface with rather small but strong, very 

 sparse punctures; scutellum with dispersed punctures basally only; 

 elytra slightly elongate, rounding apically from slightly behind the 

 middle, having very even and close-set series of rather coarse, deep 

 punctures throughout the width, the second interval irregularly 

 biseriately punctate, becoming broadly and confusedly so basally; 

 scutellum with the sparse arcuate lines so short and deep as to form 

 almost regular small rounded punctures. Length (9) 9-7 mm.; 

 width 5.0-5.4 mm. Mexico (Jalapa). The male is described as 

 having a much larger head and unusually large and conspicuous eyes. 



*megalops Bates 



Body gradually much inflated behind or very distinctly cuneiform, 

 moderately convex, shining, with very thin integuments, pale luteo- 

 flavate in color, the head and a large anterior transversely subquad- 

 rate pronotal spot pale red-brown; elytra with the suture narrowly 

 brown, the humeral callus black, the external margin pale, except 

 the fine brown beading; head (c?) four-sevenths as wide as the pro- 

 thorax, the clypeus and front to a transverse line through the middle 

 of the eyes, uniformly and very roughly punctato-rugose, abruptly 

 behind that line becoming discretely and rather strongly punctate; 

 eyes very prominent, separated by barely more than twice their 

 width; clypeus very transverse, moderately reflexed at apex, be- 

 coming parallel at base, with very broadly rounded angles; antennal 

 club rather thin, not quite as long as the stem; prothorax slightly 

 more than twice as wide as the median length, the sides rounded, 

 becoming subparallel in basal, converging in apical, half, the promi- 

 nent apical angles finely blunt at their apices, the basal rather nar- 

 rowly rounded; basal bead fine but entire, in level below the general 

 surface, which is evenly convex, extremely minutely and remotely 



