464 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
this character is in doubt. Prothorax broader than long, arcuate at 
sides. Elytra long and narrow, apex without defined spine, but the 
stone is too rough to allow of certain judgment. Legs slender, thighs 
but httle clavate. Length, 10.50 mm. ; 
Described from one specimen. 
Type.— No. 2,584 M. C. Z. Florissant, Col. (No. 11,289 S. H, 
Seudder Coll.). 
The generic determination rests upon the facies. The form is that 
of the North American species of Stenosphenus, in fact the resemblance 
is so striking as to be manifest at the first glance. The stone on which 
the insect is shown is of such rough texture that the margins of the 
impression are all more or less blurred and it is impossible to be sure 
of the presence or absence of spines upon the antennae, knees, or 
elytra. The sculpture is entirely effaced. Because of the charac- 
teristic form of the beetle, I have thought it worth figuring and naming. 
CLYTUS FLORISSANTENSIS, sp. Nov. 
Plate 10. 'te.) 1, 
Form stout for this group. Head decidedly narrower than the 
prothorax, and, including the projecting mandibles, as long as wide. 
Mandibles subtriangular in outline, the external margins moderately 
strongly and regularly arcuate, their length equal to about one half 
that of the head. Cephalic sculpture rather weak, consisting of a not 
very close granulation and rugosity. Antennae incompletely pre- 
served, but in life evidently reaching beyond the elytral tips, though 
not far, if at all, past the end of the abdomen, the first joint clavate, 
not very elongate, the second small, third distinctly longer than the 
fourth which is somewhat shorter than the fifth or sixth, the remainder 
incomplete or wanting, though a detached distal joint lying across one 
wing-cover indicates that those near the apex were somewhat greater 
in length. The third, fourth, and sixth joints, each show a strong 
inner apical spine. Eyes not definable. Prothorax much broader 
than the head, distinctly wider than long, and, owing to the strongly 
rounded sides without lateral spines, roughly transversely suborbicu- 
lar in outline as is commonly the case in this group. Surface more ~ 
strongly sculptured than the head, the sides with closely set regular 
circular granules of moderate size which become sparser and smaller 
on the disk and pronouncedly so on the anteromedian area. ‘There 
