WICKHAM: NEW MIOCENE COLEOPTERA FROM FLORISSANT. 479 
Described from a single specimen in somewhat oblique ventral view. 
Type.— No. 2,643 M. C. Z. Florissant, Col. (No. 9,430 S. H. 
Scudder Coll.). 
At first sight, I referred this beetle to Chaetocnema, but it differs 
in many points from that genus and from all others known tome. The 
broad punctured prosternum is like that of Chaetocnema but the 
antennae are more like those of Crepidodera, though shorter and 
thicker than in recent species. It is not possible to determine with 
certainty whether the front coxal cavities were open or closed, but, 
judging from the prosternum, probably the latter. The abdominal 
segmentation, if natural, is remarkable, but I think likely it is dis- 
arranged, to some extent at least, by telescoping. None of the North 
American genera have hind tibiae of this type and in the absence of 
knowledge as to the point of tarsal articulation this structure gives 
us no good clue to the location of the species though the groove reminds 
one of similar sculpture in Dibolia. On the whole, I should, for the 
: "present, place the genus in the neighborhood of Chaetocnema. 
Opontota Chevrolat. 
This genus is the only one of the Hispini known from the Florissant 
| shales. Today the group is not very strongly represented in temperate 
North America, our fauna comprising about thirty-five species, twelve 
of which belong to Odontota. 
ODONTOTA AMERICANA, Sp. nov. 
Plate 11, fig. 7-9. 
| | 
| Form rather short for this genus. Head and prothorax rough but 
the sculpture is not well defined. Elytra with deep wide striae, 
coarsely punctate at bottom. The exact shape of the punctures 
|cannot be made out as the specimen is preserved in ventral aspect and 
only those which show through can be distinguished. Length, 3.85 
mm. 
) Described from a single specimen. 
K Lype.— No. 2,644 M. C. Z. Florissant, Col. (No. 7,176 S. H. 
Scudder Coll.). A second specimen, No. 2,645 M.C.Z. (No. 10,506 
S. H. Scudder Coll.), is most likely the same species. 
| No doubt need attach to the generic identification, the form, sculp- 
ture, and structure of the 11-jointed antennae are those of Odontota. 
