309 
and more protuberant in P. gopheri and are placed lower down on the 
sides of the head, so that they can be seen from beneath; in botli the 
related species the eyes are flat, more elongate and are not visible from 
beneath. 
From P. discoideus it is readily distinguished by the long antennae 
and the sexual characters of the male. As is the case with Aphodius 
troglodytes this insect turns darker after death. In life its color is pale 
yellow like the sand in which it lives. 
Chelyoxemis n. g. 
Head retracted; antenn.e inserted under margin of the front; prosteruiun not 
lobed anteriorly, convex, bistriate; antennal fossa? immediately in front of the an- 
terior coxa*; mesosternum truncate anteriorly; elytra with five dorsal striae, the 
four outer ones nearly entire, the fifth abbreviated and usually appendiculated at 
apex; pygidium triangular, convex, greatly and rather suddenly indexed apically; 
femora not incrassated; front tibhe dilated and multi-dentate; middle and hind 
tibhe slender, biseriately spinose; tarsi of middle and hind legs slender; claws 
strikingly unequal in length: the inner one very slender and almost as long as the 
claw joint, the outer one spine-like and only about one-fourth the length of the 
inner claw. 
This new genus of Histeridse is proposed for a rather small species 
which agrees with Saprinus in all essential characters excepting the 
structure of the tarsal claws. Uni-unguiculated genera of Histeridae 
are known both in the Histrini (Cypturus and Monoplius) and Saprini 
(Xiphonotus), but I am not aware that a genus has been described 
exhibiting a marked inequality of the claws. Superficially, this genus 
may be distinguished from Saprinus by the more complete elytral stria- 
tion and also by the somewhat less ovate and less convex form of the 
body. 
Chelyoxemis xerobatis n. sp. 
Oval, shining, black, without metallic reflections. Head sparsely, minutely 
puuctulate, front not margined, supra-orbital stria distinct, extending a short 
distance upon the front. Thorax fully twice as wide as long, sides conver- 
gent anteriorly, and nearly straight from the base to apical fourth, thence arched; 
a single marginal stria; very finely and sparsely 
puuctulate on the disk, more coarsely and densely 
on the sides. Elytra at apex finely, sparsely and 
rather irregularly punctate, the punctures extend- 
ing slightly between the stria, the remainder of the 
elytral surface A r ery minutely and sparsely puuctu- 
late; a single very long subhumeral stria usually 
but slightly abbreviated at either extremity, some- 
times interrupted or obsolete anteriorly; oblique 
humeral stria long, distinctly impressed; dorsal 
striae 1 to 4 subequal in length, extending from the 
base nearly to the apex of the elytra, deeply im- 
pressed and obsoletely punctured, not hooked at 
base, fourth arched at base, joining the sutural stria, 
which is strongly impressed and entire; between the 
fourth dorsal and the sutural a strongly impressed 
fifth stria of varying length, beginning sharply a short distance below the arch, fre- 
quently interrupted and continued by punctures at the apical end, where it is accom- 
Fig.19.— Chelyoxenus xerobatis: a, b, 
variations in elytral sculpture; 
c, claw of left bind leg— enlarged 
(original). 
