342 MEMOIRS ON THE COLEOPTERA 



pygidium with rather more numerous scales and shorter erect hairs; 

 middle tarsi much shorter than the tibiae. Length 35.0 mm.; 

 width 16.8 mm. One specimen. 



Colorado (the female type described above) and New Mexico 



(Las Vegas, j a single male) speciosa Csy. 



A Female nearly as in the same sex of speciosa but not quite so large, 

 the elytra black but sometimes concolorous and castaneous; 

 sculpture and vestiture nearly similar throughout but differing 

 in the antennae; in speciosa the first joint of the club extends far 

 beyond the middle of the outer five compact equal joints and its 

 apex is gradually and acutely pointed, it being precisely similar 

 on the two antennae; in the present subspecies the club is barely 

 longer than the stem without the basal joint, and its first joint is 

 very short, quadrate, with its apex truncate and far from attaining 

 the middle of the club proper; this formation of the club is prac- 

 tically constant throughout the five females at hand. Length 

 30.0-36.0 mm.; width 14.0-16.5 mm.; length of antennal club in 

 the largest specimen 2.3 mm. 



Male smaller than the male of speciosa and not so stout, the 

 antennal club more than four times as long as the stem. Two 

 specimens. Length 28.0-32.0 mm.; width 14.8-15.2 mm. 



New Mexico (Jemez Springs), Woodgate. . . . acomana n. subsp. 

 Antennal club ( 9 ) scarcely more developed than in the lo-lineata section. 

 Body ( 9 ) very much smaller and narrower than in either of the 

 above forms, cylindric-oval, strongly shining, pale castaneo-rufous 

 throughout, the abdomen not at all darker; legs and antennae 

 ferruginous; head short; vertex and occiput blackish, the former 

 strongly, densely punctured and with some moderately long coarse 

 erect brown hairs, densely albidb-squamose toward the eyes; clypeus 

 peculiar in sculpture, flat, strongly reflexed and broadly bisinuate 

 at apex, the reflexed edge rather prominent medially, the angles 

 right, blunt, the sides parallel, the surface with rather coarse, 

 shallow, remotely and irregularly distributed punctures throughout, 

 some bearing long scales and some erect hairs; last palpal joint 

 slender but not narrower than the preceding, antennal club as 

 long as the three preceding joints, its first joint on the left antenna 

 of the single type specimen short, quadrate, extending to the middle 

 of the next joint, with its apex rectilinearly truncate, the formation 

 as in acomana; on the right antenna, however, this first joint of the 

 club is much longer, extending with full width to apical fourth, 

 connate with the next joint and with its apex broadly subangulate; 

 this joint, in spite of its virtual constancy on all the antennae of the 

 five females of acomana, is therefore subject to singular variation, 

 and may be unreliable as a specific criterion, or, as this short first 

 joint of the club on the right antenna is connate with the next joint 

 throughout its surface, it may be counted simply as an accidental 

 malformation, not affecting the value of the character in its normal 

 development; prothorax twice as wide as long, strongly prominent 

 and angulate at the sides, twice as wide as long, very shining, with 

 sparse shallow punctures containing broadly rounded scales, the 



