TENEBRIONID/E 127 



schides and subsequent genera of the table. The last joint of the 

 male maxillary palpi is scalene and much larger than in the female, 

 conforming to the Pelecyphonis type, the labrum having the usual 

 small deep median sinus at apex, the antennae moderately de- 

 veloped, slightly enlarged subapically from the base of the ninth 

 joint, the eyes very short, almost five times as wide as long, with 

 the anterior margin subsinuate, the mentum small, obtrapezoidal, 

 separated from the sides of the buccal opening, the gular support 

 moderately high and the ligula unusually small though tumid and 

 non-retractile. The prosternum is rapidly convex and deflexed 

 posteriorly, becoming vertical at the hind margin, the legs rather 

 short and slender, the tarsi with short spinules beneath, the anterior 

 tibiae only minutely everted and acute externally at tip and the 

 trochantin is well developed. The body is moderately large to 

 small in size, generally opaque and with very varied vestiture of 

 short squamules; in bibasalis it is wholly glabrous, except the dense 

 tomentum at the thoracic and elytral bases. The species are 

 rather numerous and widely diffused from southern Arizona to 

 southern Mexico; those represented in my collection may be 

 described as follows: 



Elytra each with three discal carinee 2 



Elytra each with two discal carinae, the inner of the usual three obsoles- 

 cent 7 



2 Basal margin of the pronotum with a dense fringe of tomentum. . . .3 

 Basal margin without a fringe of tomentum, at least sufficiently extensive 



or dense to be noticeable 4 



3 Form oblong-oval, rather depressed, opaque, piceous-brown in color; 

 head feebly tri-impressed, finely, sparsely punctate and with short 

 stiff yellow hairs; prothorax three-fifths wider than the median 

 length, widest slightly behind the middle, the apex distinctly nar- 

 rower than the base, deeply, circularly sinuate, the angles acute, 

 not blunt at tip; sides very evenly, moderately arcuate from apex 

 to base, the latter broadly, deeply bisinuate, the angles strongly 

 projecting posteriorly inside of the reflexed elytral humeri and acute; 

 surface rather feebly convex, coarsely, densely but unevenly punc- 

 tate, with some small vacant patches and a slightly embossed narrow 

 subinterrupted median line, becoming rather gradually and broadly 

 concave and reflexed, and still more coarsely, very densely punctate 

 laterally, the edge rather thick but even, each puncture with a 

 small subdecumbent, very coarse and distinct yellow hair: basal 

 margin thick and truncate vertically toward the middle and clothed 

 very densely with yellow pubescence; elytra scarcely one-half 

 longer than wide, barely a fourth wider than the prothorax, obliquely 



