AMERICAN COLEOPTERA. 2o 



very deeply impressed. Mentum horizontal, scarcely declivous in 

 front, a transverse row of long setae, but without trace of accompany- 

 ing ridge except in rare instances. Head densely punctate; clypeal 

 margin truncate or slightly sinuate at middle, the angles rather sharply 

 defined but obtuse, without or with only a slight external sinuation; 

 clypeal suture distinct at sides, usually faint or subobsolete at middle; 

 front broadly feebly impressed at middle, behind the clypeal suture. 

 Prothorax three-fifths wider than long, widest at or just behind the 

 middle, where the sides are rather strongly rounded; margin often with 

 a slight sinuation behind the front angles, the latter distinct but not 

 prominent; hind angles obtuse but well defined; surface densely but 

 usually a little unevenly punctured. Elytra one-third wider than the 

 prothorax and about two and three-quarter times as long, wider 

 behind, punctuation rather dense throughout, confused between the 

 pairs of geminate stria? which inclose the very faint discal costae, but 

 arranged in nearly regular series at the sides. Beneath sparsely hairy, 

 metasternum rather coarsely and closely punctate at sides; abdomen 

 moderately punctate and with a sharply defined raised line separating 

 the ventral and dorsal surfaces. Propygidium with well defined 

 apical marginal groove. Ungual tooth subapical, broadly truncate at 

 tip. Length 6.2-8 mm.; width 3.4-4.2 mm. 



This species occurs in southeastern Arizona. Hubbard and 

 Schwarz found it plentiful at Oracle and in the Santa Rita 

 Mountains in June and July on "Mimosa sp." It was taken 

 by Mr. Beyer in the Rincon Mountains, and is present in 

 several other collections with the simple label "Arizona." 

 Though very closely related to the following species, it is 

 separated readily enough with a little care by the tabular 

 characters. 



There is in the LeConte collection a specimen of this species 

 bearing label " popino type" in Casey's handwriting. I have 

 no doubt, however, that this was inadvertently mixed with 

 his specimens of the following species, which is the one to 

 which his description best applies and of which the type in his 

 own collection is probably a representative. 



4. D. popino Csy. 



Form and vestiture as in mimosa?; color reddish brown to castaneous. 

 Labrum deeply emarginate (bilobed) . Clypeal margin broadly sinuate 

 at middle, the limiting angles rather prominent and dentiform, the 

 sinuation on the outer side usually well marked. Punctuation similar 

 to that in the preceding species but somewhat less dense; alutaceous 



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



