1878. ] 579 (Horn. 
segment at least as long as the next two, 2-3-4 equal, fifth longer. Tarsi 
variable, long in two genera, rather short in Orylemus. 
Our genera are three in number. 
Tarsi rather short, the first three joints not as long as the fourth. An- 
tenn ten-jointed, club solid. Anterior coxee contiguous, their cavi- 
ties very narrowly.closed. behind. .............. catsaeiaels Oxyleemus. 
Tarsi moderately long, first three joints longer than the fourth. Antenne 
eleven-jointed, club three-jointed, anterior coxze distinctly separated, 
their cavities distinctly closed behind............-... Deretaphrus. 
Tarsi long, first joint always longer than the next two together, and that of 
the middle tarsus much longer. Antenne eleven-jointed, club two- 
jointed. Anterior coxze contiguous, their cavities distinctly closed 
WO@UMUN ea eachefar stole roscistoyel ctsszelevatsierereis tei ays is) (aos, ore 2s we. 6: aya ayels's Sosylus. 
In Oxylemus the point of the prosternum is not visible be- 
hind the coxe, and when the prothorax is not disarticulated 
the cavities are apparently open behind. They are really 
narrowly closed by the extension of the epimera to the 
slender point of the prosternum. In the other two genera the 
point of the sternum is distinctly visible behind the coxe. 
Deretaphrus is further remarkable for the transverse impres- 
sion immediately in front of the anterior coxe. 
Deretaphrus occurs in Oregon ; the other two genera have 
representatives on both sides of the continent. 
OXYLZEMUS Erichs. 
Antenne ten-jointed, terminated by an abrupt club consisting of the en- 
larged glabrous tenth joint, at the tip of which the eleventh appears as a 
pubescent space, base free. Head beneath without antennal grooves. Eyes 
round, moderately coarsely granulated. Anterior cox contiguous, the 
cavity narrowly closed behind, prosternum extremely narrow, deeply de- 
pressed between the coxee. Middle coxe very closely approximated. Pos- 
terior coxee separated by a triangular intercoxal process. Anterior tibie 
with the outer apical angle acute, slightly prolonged, and with two fine 
denticles at middle, middle and posterior tibiz spinulose near the tip, all 
the tibiz with short terminal spurs. Tarsi rather short, the first three 
joints together shorter than the fourth. 
The anterior coxee have been described as open behind, this 
has not been found accurate. On breaking a specimen it will 
be seen that the coxee are rather prominent and conceal not 
only the point of the sternum, but also the extension of the 
