WICKHAM: NEW MIOCENE COLEOPTERA FROM FLORISSANT. 487 
Type— No. 2,683 M. C. Z. Florissant, Col. (No. 4,412 S. H. 
Scudder Coll.). 
This has all the appearance of a cistelid of the general type of Hy- 
menorus. It is easily distinguished from Isomira florissantensis by 
the different antennae. 
The name is given in memory of the late Dr. F. V. Hayden. 
OEDEMERIDAE. 
COPIDITA MIOCENICA, sp. nov. 
Plate 15, fig. 1-2. 
Form elongate and rather slender. Head long, muzzle strongly 
projecting. Eye not shown in entirety. Antennae rather short, the 
distal joints visibly shorter than the subbasal ones, serration slight. 
Prothorax, as preserved, distinctly longer than broad, the sides not 
in good enough condition to be certain of their form. Elytra about 
four and two thirds times as long as the prothorax, sides parallel, 
apices bluntly rounded. Legs slender but not very long. Length, to 
elytral apices, 11.90 mm.; of elytron, 8.35 mm. 
Described from one specimen. 
Type.— No. 2,684 M. C. Z. Florissant, Col. (No. 12,481 S. H. 
Scudder Coll.). 
This insect must have been of about the same build as the recent 
Colorado species, C. bicolor and C. obscura. The entire upper surface 
of the body was clothed with short hairs, sparsely preserved but per- 
haps more numerous in life. The antennae and legs are covered with 
much finer and closer hairs. The similarity of antennal structure in 
the recent and fossil species is quite pronounced, as far as the joints 
can be definitely made out but unfortunately the entire base is poorly 
exhibited upon the stone. The sculpture was evidently faint as 
nothing but the merest traces of fine punctuation can be distinguished. 
PALOEDEMERA, gen. nov. 
Form stout. Mandibles prominent. Elytra apparently not much 
if at all narrowed apically. Legs stout, posterior with strongly thick- 
ened and toothed femur, tibia curved and produced at apex, tarsus 
