THE CANADIAN ENTOMOLOGIST. 41 



strongly rounding to the apex and slightly prominent before the 

 middle, thence strongly converging to the base, finely, sparsely 

 punctate, the punctures rather abruptly coarse and slightly muricate 

 near the sides ; elytra with minute, sparse and simple punctures, 

 much wrinkled toward base, and with some small tubercles near the 

 humeral angles. Length 16.0 mm.; width 5.5 mm. Arizona .... 



caudal is, n. sp. 



Terminal grooves very short as usual 12 



12. Form very slender in the ^ and nearly similar in the 9; prothorax 

 as long as wide, or slightly longer ( ^ ), finely, feebly, rather sparsely 

 and simply punctate, abruptly coarsely, densely and submuricately 

 so very near the lateral edges, the latter converging and straight 

 from the feeble ante-median prominences more than half way to 

 the tip, then rounded to the apex, converging and broadly arcuate 

 toward base ; elytra nearly as in caudal is, but rather more rugulose. 

 Length 18.0 mm.; width 5.8 mm. Arizona (Grand Canyon 

 of the Colorado) hegubris, n. sp. 



Form moderately slender, larger and less slender than in lugubris, 

 similarly dull in lustre; prothorax fully as wide as long, in form and 

 sculpture nearly similar to lugubris, but less promment at the sides 

 just before the middle, and much more tuberculose on the flanks, 

 thence to the base ; elytra nearly similar, but with coarser vermicu- 

 late impressed lines and shorter, stronger apical tubercles ; pro- 

 sternum much more strongly tuberculose, not evenly as in lugubris, 

 but in uneven transverse lines. Length 19.0 mm.; width 6 6 mm. 

 Arizona (Grand Canyon of the Colorado), T. Mitchell Prudden .... 



Fruddeni, n. sp. 



Form stouter and more parallel than the twO' preceding, and less 

 constricted at the junction of the elytra and prothorax, the latter 

 nearly as in lugubris, but with less converging straight sides 

 anteriorly, which are more abruptly and briefly rounded to the apex 

 at tip ; similarly converging and arcuate, with the flanks tuber- 

 culose, posteriorly ; surface minutely, sparsely, simply punctate, the 

 punctures not noticeably coarser or denser toward the sides, except 

 slightly along the immediate subprominent edge anteriorly ; elytra 

 somewhat flattened above, almost smooth but dull as usual, with a 

 few fine tubercles near the humeral angles. Length 20.0 mm.; 

 width 7.0 mm. Arizona luctuosus, n. sp. 



