32 H. C. FALL. 



species, however, had long been in various collections, usually 

 under the name mcerens. The prominent deeply divided 

 labrum and excavated mentum at once distinguish this species 

 from all others in our fauna, except fissilabris, from which the 

 tabular characters are probably sufficient to separate it; fur- 

 ther differences being given under fissilabris. 



15. D. fissilabris n. sp. 



Very similar to knausii in most respects, the chief differences being 

 as follows: the labrum, though very prominent, is less so than in 

 knausii; transverse clypeal ridge less pronounced, frontal impression 

 vague or obsolete, prothorax more obviously narrowed in front, elytral 

 punctures of third intercostal space more evidently confused in basal 

 half, ventral segments without tubercles in either sex, but with a 

 series of short parallel rugae on segments 2-4 in the male; basal joint 

 of front tarsi not broader than the second joint in the male, all the 

 joints being merely a little stouter in this sex; ungual tooth slightly 

 more apical in position. Length 8.3-10.5 mm. 



All specimens seen are from southern Arizona. It was 

 taken there by Morrison years ago — locality not indicated — 

 and more recently at Tucson by Wickham and Hubbard or 

 Schwarz, and at Florence by Biederman. A male specimen 

 collected by Dr. Skinner in the Huachuca Mountains differs a 

 little in having the punctures of the second intercostal space 

 slightly confused, and in the more produced inner angles of 

 the front tarsal joints. 



16. D. schaefteri n. sp. 



Oblong ovate, rufoferruginous. Elytra minutely, prothorax just 

 visibly alutaceous. Mentum very broadly subconvex or nearly flat 

 throughout, the anterior declivity scarcely detectable though defined 

 posteriorly by the transverse row of setigerous punctures, which are 

 at or slightly in advance of the middle. Clypeus moderately strongly 

 reflexed, broadly feebly sinuate at middle with rounded angles; clypeus 

 and front moderately densely punctate, the punctures becoming 

 sparser toward the occiput; clypeal suture finely impressed, subobso- 

 lete at middle in some specimens. Prothorax slightly more than one- 

 half wider than long, widest at about the middle, where the sides are 

 rather narrowly or subangularly rounded; nearly straight before and 

 behind; angles obtuse but well defined; punctuation rather fine and 

 dense, the punctures separated by rather less than their own diameters 

 on the average. Elytra three-tenths longer than wide, two and three- 

 fourths times as long and nearly one-half wider than the thorax, dis- 



