262 NATURAL History BULLETIN. 
Head quadrate, eyes large, prominent, occipital foveze 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. Aztenne slightly longer than the head and 
prothorax, red; first 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 
fovee longer than in D. abnorme. Hlytra 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. Addomen with the first dorsal longer 
in the middle than at the sides, half as long as the elytra, 
carine including one-half of the entire width. ¢ with the 
intermediate thigh grooved from the middle above to the 
distal end below, the spine consequently more prominent. 
Dark ¢ specimens may be mistaken for large 99 of D. abnorme 
with damaged pubescence. 
Habitat. Northwestern States east of the Missouri river. 
D. sticMosum, Srend. Brown, pubescence short, appres- 
sed, thin, yellow. Length, 1.7 mm. Plate VIL, Fig. 39. 
H[ead nearly plane, but slightly convex, without occipital 
fovea, the lateral, grooves interrupted, frontal margin straight. 
inter-antennal space very slightly depressed, densely punc- 
tured. Antenne 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. Palpi 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- 
