AMERICAN COLEOPTERA. 31 



"From muricata this species differs in being more robust, 

 the elytra widening towards apex, much shorter and finer 

 pale hairs and the elytra punctuation different." 



The above description and remarks have been taken from 

 Mr. Schaeffer's paper, as I have not seen the unique type, 

 which is in the Museum of the Brooklyn Institute. 



14. D. knausii Schf. 



Elongate oblong, sides nearly parallel, ferruginous to piceous, 

 glabrous, moderately shining. Mentum deeply parabolically excavate 

 in front; labrum deeply divided, the lobes prominent. Head densely 

 rather coarsely punctate, front with a rather deep triangular impres- 

 sion behind the clypeal suture, the latter distinct; clypeus transversely 

 tumid posteriorly, moderately reflexed in front, margin feebly or mod- 

 erately sinuate at middle. Prothorax barely two-thirds as long as 

 wide, widest at or a little behind the middle, sides broadly arcuate, 

 very slightly convergent posteriorly, a little more so in front, apex 

 not much narrower than the base; disk closely punctate throughout, 

 a little less so at middle; sides with a sub transverse impression anter- 

 iorly, the median lateral fovea usually distinct but variable. Elytra 

 fully two and one-half times as long as, and about one-eighth wider than 

 the prothorax; almost one-half longer than wide, not dilated poster- 

 iorly; punctures somewhat coarser than those of the prothorax and 

 arranged in regular lines except between the suture and first geminate 

 stria; costae very indistinct, each with a row of very fine rather distant 

 punctures. Body beneath rather sparsely but coarsely punctate at 

 sides, finely and still more sparsely along the middle; second, third, 

 and fourth ventrals with a striate tubercle on each side of the middle, 

 these decreasing in size from the base and frequently obsolete, except 

 the basal ones, in the female. Pygidium very coarsely rugosely 

 punctate; propygidium with apical coarsely punctured marginal 

 groove. Upper tooth of front tibiae midway between the base and 

 apical tooth. Basal joint of anterior tarsus compressed, triangular 

 and about as wide as long in the male, much less dilated in the female. 

 Claws cleft subapically, the interior portion obviously shorter. 

 Length S. 75-11 mm.; width 4.3-5.25 mm. 



Habitat. — -Nevada (Las Vegas — type) ; Utah (Horn collec- 

 tion) ; Arizona (Tucson — Leng collection ; Riverside — Wick- 

 ham; Hot Springs — Barber and Schwarz; Phoenix — Dr. Grif- 

 fith). 



The types of this remarkable species were taken not long 

 since in southern Nevada by Mr. Tom Spalding, and sent to 

 Mr. Knaus, to whom I am indebted for an example. The 



TRANS. AM. ENT. SOC, XXXV. FEBRUARY, 1909- 



