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 



