1852.) | 169 
appendage. The following scheme may aid the student in determining the 
species, which in the western part of the continent will become quite numerous 
and very difficult. 
A. Ungues omnes appendiculati. 
a. Thorace transverso, marginibus integris, Sp. 1—8. 
b. Thorace elongato, marginibus integris, Sp. 9. 
ec. Thorace lateribus serrulatis, Sp. 10—17. 
B, Ungues non appendiculati, Sp. 18—19. 
A—a. 
1. D. fuscus, ftisco-subeneus, dense fusco-pubescens, obesus, thorace 
longitudine duplo latiore, lateribus valde rotundatis, elytris convexis, subtilius 
sat dense punctulatis, pedibus rufo-piceis. Long. °14. 
Vallecitas, California, May. The male has the thorax wider than the elytra, 
which are a little narrowed posteriorly. 
2. D. suturalis, oblongus nigro-eneus, subtiliter cinereo-pubescens, 
dense nigro-pilosellus, thorace latitudine paulo breviore, lateribus paulo rotun- 
datis, angulis posticis obtusis, elytris confertim punctulatis et subrugosis, 
sutura lateribusque densius cinereo pubescentibus. Long. -13—-15. 
San Diego, California. In the male the elytra are narrower than the thorax, 
and narrowed posteriorly. 
3. D. conformis, nigro-eneus, subtiliter cinereo-pubescens, dense nigro- 
pilosellus, oblongus, thorace lJatitudine breviore, lateribus et angulis posticis 
valde rotundatis, elytris confertim punctulatis et subrugosis, sutura sepius 
densius cinereo-pubescente. Long. -12—-14. 
San Diego. Very similar to the last, and only differing in the form of the 
thorax; the male has the elytra slightly nairowed posteriorly. 
4. D. sordidus, oblongus, convexus, zneo-piceus, longius sordide 
pubescens, et nigro-pilosellus, thorace latitudine breviore, parce subtiliter 
punctulato, lateribus rotundatis, elytris sat dense minus subtiliter punctatis. 
Long. :14. 
San Diego, abundant; distinguished by the equally distributed coarse pubes- 
cence and longer more numerous erect black hairs. The male is a little nar- 
rower than the female. 
6. D, griseus, oblongus, convexus, xneo-piceus, densius longe sordide 
pubescens, non pilosellus, thorace latitudine. breviore, punctulato, lateribus 
rotundatis, elytris sat dense grossius’ punctatis, pedibus antennisque rufis. 
Long. *1. 
One specimen, California, (San Diego?). The joints of the antenne are not 
transverse and from the 4th—10th are equal in size. The preceding species 
have the antenne serrate only from the Sth joint. 
6. D. brevicornis, oblongo-cylindricus, eneo-piceus, dense subtiliter 
longe cinereo-pubescens, non pilosellus, thorace latitudine breviore, punctulato, 
lateribus valde rotundatis, elytris sat dense grossius punctatis, pedibus anten- 
nisque rufis, his articulis a 4to subtransversis. Long. °1. 
San Diego. A little narrower than D. griseus, and with more rounded thorax. 
The antennz are shorter, the joints from the 4th are transverse, and the 7th and 
8th are a little narrower than those which precede them. 
7. D. squalidus, oblongo-elongatus, eneo-piceus, subtiliter longe cinereo- 
pubescens, nigro-pilosellus, thorace transverso parce punctulato, lateribus paulo 
rotundatis, angulis posticis obtusis, elytris sat dense grossius punctatis, dorso 
leviter depressis. Long. :09. 
San Diego, two specimens. Resembles most nearly D, suturalis, but is small- 
er; the posterior angles of the thorax are less distinct, and the elytra less 
finely punctured. Asin D. suturalis, the 4th joint of the antenne is scarcely 
dilated. 
