WICKHAM: FOSSIL ELATERIDAE OF FLORISSANT. 507 
Described from one specimen. 
Type.— No. 2,761 M. C. Z. Florissant, Colo. (No. 5,294 S. H. 
Scudder Coll.). 
This has the size and general appearance of Cryptohypnus and, as 
far as shown, the sculpture seems to be like that of the recent C. pec- 
toralis. In form, the present insect differs widely from the Florissant 
fossil C. exterminatus. 
ANCHASTUS ERUPTUS, sp. nov. 
Plate 3, fig. 2, 3: 
Form moderately stout. Sculpture of head not definable. Anten- 
nae long, that on the right side, (as preserved), showing nine joints, 
the terminal one of which, in life, would have reached well behind the 
prothoracic basal angles, so it is likely that if complete the antennae 
would have extended nearly to the elytral middle. The first joint is 
large, the second small, third much larger than the second but a little 
shorter than the fourth, fifth not in good condition, sixth and fol- 
lowing longer than the fourth, serrations, in general, well pronounced. 
Prothorax with strongly curved prosternal sutures, lobe short, spine 
stout and short, punctuation of flanks and sternum minute and incon- 
spicuous. Elytra conjointly rounded apically, sculpture not showing 
through. Abdominal sculpture very fine. Length, from front of 
head to elytral apex, 4.80 mm.; of elytron, about 3.00 mm. 
Described from one specimen. 
Type.— No. 2,760 M. C. Z. Florissant, Colo. (No. 11,281 S. H. 
Scudder Coll.). 
The coxal plates do not show up well, but seem to be very narrow 
externally and broad internally, as in Anchastus. This genus has 
similar antennal and prosternal characters, also. 
ANCHASTUS DILUVIALIS, sp. nov. 
Plate 3, fig. 4. 
Form moderately elongate. Head not visibly punctured beneath. 
Antennae poorly defined. Prothorax closely, distinctly, and regularly 
but finely punctate on the flanks and sternum, the grooves strongly 
double, curved. The prothoracic outline is obscured to some extent 
