AMERICAN COLEOPTERA. 71 



long as the prothorax, barely two-fifths longer than wide, sides broadly 

 arcuate and subparallel; costas fairly distinct, slightly more convex, 

 intercostae all with confused punctuation. Pygidium coarsely sub- 

 rugosely punctate; propygidium with coarsely punctate apical groove. 

 Body beneath coarsely densely punctate laterally, the metasternum 

 much more finely so at middle. Upper tooth of front tibiae slightly 

 antemedian; hind thighs numerously punctate at middle. Ungual 

 tooth subapical, small, acute and parallel with, but shorter than the 

 upper portion of the claw on the front feet of the male, on the middle 

 and hind feet of the male and throughout in the female of normal form, 

 broad and obliquely truncate, its apex about three times as distant 

 from the base as from the point of the claw. Length 9.5-10.6 mm.; 

 width 5.2-5.6 mm. 



The type was found by Dr. Webb in the Gila Valley, 

 Arizona. It is also known from Utah and Nevada. 



As already noted p. 2, this species was originally made the 

 type of the genus Orsonyx Lee. 



68. 1). antliracina n. sp. 



Oblong, feebly ovate, black, moderately shining, elytra finely alu- 

 taceous, prothorax barely visibly so. Mental declivity short, steep, 

 strongly margined. Clypeal margin broadly sinuate at middle, rounded 

 at sides. Clypeal suture rather strongly impressed, clypeus with a faint 

 transverse tumidity; front broadly bi-impressed, punctuation dense. 

 Prothorax only slightly more than one-half wider than long; sides 

 broadly rounded and convergent in front, parallel and nearly straight 

 in basal two-thirds, hind angles rectangular; punctuation fine and 

 sparse. Elytra one-fifth longer than wide, two-fifths wider than the 

 prothorax and not quite two and three-fifths times as long, a little 

 wider posteriorly; costas distinct, intercostae with rather sparse and 

 fine irregular punctuation, the serial punctures of the narrow intervals 

 very minute. Body beneath punctate about as usual. Upper tooth 

 of front tibiae a little in front of the middle; hind thighs sparsely finely 

 punctate at middle; claw with a stout obliquely truncate subapical 

 tooth, its apex nearly twice as distant from the base as from the tip 

 of the claw. Length 11 mm.; width 5.9 mm. 



The type was given me some years ago by Mr. Beyer, who 

 took it at Santa Rosa, Lower California. 



The form of the prothorax is the most striking character of 

 this species, and, taken together with the size, color and fine 

 sparse thoracic punctuation, should make the species easily 

 recognizable. There is on the thorax a very minute secondary 

 punctuation which does not appear on the elytra. 



TRANS. AM. ENT. SOC, XXXV. MARCH, 1909. 



