42 H. C. FALL. 



punctate at sides; ventral segments rather coarsely and closely punc- 

 tate at sides, less coarsely and closely at middle. Upper tooth of 

 front tibia slightly nearer the apex than the base. Hind thighs not 

 punctured at middle; claws with short median tooth, its tip as far 

 from the apex as from the base of the claw. Length 11-12J mm.; 

 width 5f-6f mm. 



This species has been taken in some numbers at Fort Grant 

 (type) and Oracle, Arizona, by Hubbard and Schwarz; also 

 taken" by Oslar and Schaeffer, in the Huachuca Mountains. 

 The National Museum specimens were identified as brevidens, 

 and quite naturally so, as this species agrees in the unusual 

 ungual formation and occurs in the same region. The 

 two are plainly different, however, brevidens being a smaller 

 more cylindrical species, with acutely elevated mental ridge, 

 longer and differently shaped prothorax, much broader ter- 

 minal joint of maxillary palpi, and more posterior upper tooth 

 of front tibia. In brevidens the middle and anterior lateral 

 thoracic foveae are best defined (quite strongly in type), the 

 posterior fovea obsolete; in dentella it is the anterior fovea 

 that is absent. 



28. D. insignis Lee. 



Oblong ovate, rufoferruginous, moderately shining. Mentum nearly 

 as in haydenii, the declivity beginning at the anterior two-fifths. 

 Clypeal margin truncate and very feebly sinuate at middle, angles 

 broadly rounded. Head densely punctate with feeble but evident 

 post-clypeal convexity, above which are faint frontal impressions. 

 Prothorax short, obliquely narrowed in front, hind angles a little 

 obtuse and sharply defined; punctuation coarse and close. Elytra 

 strongly more sparsely punctate than in haydenii, feebly tricostate. 

 Abdomen finely sparsely punctate at middle, closely but not very 

 coarsely so at sides; hind coxae punctate posteriorly and exteriorly. 

 Upper tooth of front tibia midway between base and apex. Ungual 

 tooth median in position, its outer edge nearly perpendicular to the 

 claw, its apex very nearly equidistant from the base and point of the 

 claw. Length 13 mm. 



Salt Lake Desert. 



I have seen nothing that agrees exactly with the unique 

 type, and though closely related to two or three of the neigh- 

 boring forms, I do not with the present material, feel war- 

 ranted in uniting any of them with it. Its nearest allies 



