262 Natural History Bulletin. 



Head quadrate, eyes large, prominent, occipital foveas small, 

 grooves deep, dividing the frontal margin from the frontal 

 tubercles, the intermediate space with nine punctures in three 

 rows. In some specimens there is a round median impression 

 on the vertex. AntenncB slightly longer than the head and 

 prothorax, red; tirst joint obconical, half as thick as long, 

 second oblong, slightly smaller, third to fifth gradually shorter 

 becoming globular, the succeeding four gradually wider, not 

 longer, obconical, tenth ovate, not acuminate, twice as thick 

 as the ninth. The last palpal joint is twice as long as wide, 

 conical, pointed from the middle. Prothorax with the basal 

 foveee longer than in D. abnorme. Elytra convex, suture one- 

 fourth longer than the prothorax, width across the high prom- 

 inent shoulders the same; tip one-fourth wider. Discal lines 

 sharp, intervals not convex, sloping, highest next to the discal 

 lines, sides arcuate. Abdomen with the first dorsal longer 

 in the middle than at the sides, half as long as the elytra, 

 carina? including one-half of the entire width. ^ with the 

 intermediate thigh grooved from the middle above to the 

 distal end below, the spine consequentl}' more prominent. 

 Dark ? specimens may be mistaken for large ?? of D. abnorme 

 with damaged pubescence. 



Habitat. Northwestern States east of the Missouri river. 



D. STiGMOsuM, Brend. Brown, pubescence short, appres- 

 sed, thin, yellow. Length, 1.7 mm. Plate VII., Fig. 39. 



Head nearly plane, but slightly convex, without occipital 

 fovea, the lateral grooves interrupted, frontal margin straight, 

 inter-antennal space very slightly depressed, densely punc- 

 tured. AntenncB as long as the head and prothorax, joints 

 one and two oblong, obconical, third to ninth gradually 

 increasing in width, not in length, the third smaller than the 

 second. The ninth joint is twice as wide as the third, the 

 tenth oval, somewhat more roundly pointed in the middle, 

 wider than the ninth. Palfi with the second joint clavate 

 from near the middle, the third globular, as thick as the last 

 which is three times longer and pointed at each end. Pro- 



