1878. ] 581 [Horn. 
D. oregonensis Horn, Trans. Am. Ent. Soc. 1872, p. 146. 
Cylindrical, black, opaque. Head finely punctate. Thorax one-half 
longer than wide, base narrower than apex, sides in front fvebly arcuate, 
basal half gradually sinuate, hind angles rectangular, disc sparsely punc- 
tate, a deeply impressed median line, not attaining the apex and divided 
into two unequal portions, and attaining the basal marginal line. Elytra 
with three discal coste and margin moderately elevated, intervals with two 
rows of coarse, deep punctures not closely placed. Body beneath sparsely 
punctate, abdomen more finely. Length .42 inch; 10.5 mm. 
This species bears a close resemblance to fossus Nm. and 
differs in the deeper thoracic line which more nearly attains 
the basal edge of the thorax, and by the costee being much 
more elevated, especially that of the third interval, which is 
scarcely at all elevated in fossus. 
Occurs in Oregon, and does not appear to be rare. It may 
be worthy of mention that the other species of this genus 
are from Australia. 
SOSYLUS Erichs. 
Antenne eleven-jointed, last two joints forming an abrupt club, base 
free, received in repose in oblique grooves on the under side of the head, 
first joint oval, gibbous in front, so that the second joint appears to arise 
from the posterior side, second joint cylindrical, longer than the third, 3-9 
about equal, ten and eleven forming an abrupt club, the eleventh longer 
than the tenth, and nearly semi-circular. Mentum not retracted, gular pe- 
duncle not prominent. Anterior cox contiguous, their cavities apparently 
confluent. Middle coxe closely approximated. Posterior coxee small, 
rounded, rather widely separated by a quadrangular process, arcuate in 
front. Anterior tibiz moderately dilated, the apical angle prolonged, two 
terminal spurs, the anterior long and arcuate, the posterior small. Middle 
tibie similar to the anterior, but less prolonged at tip. Posterior tibie still 
less dilated, spurs small but unequal. Tarsi elongate, longer than the 
tibiee, first joint nearly as long asthe others together. First abdominal seg- 
ment as long as the next three together, two to five gradually decreasing 
in length. 
Our species are two in number. 
Elytral intervals moderately densely punctulate. Genz simple. .costatus. 
Elytral intervals sparsely punctate. Gen with a dentiform prolongation 
OMECACIYSI MG aeishe 3-4. ie shes) -isho tities chelate & cp eicise mls cielsisiatess dentiger. 
The latter character deserves more than a passing men- 
tion. It consists in a pyramidal prolongation downward of 
the sides of the gene, being the extension of the ridge limit- 
ing the antennal groove in front. I can not recall the occur- 
