WICKHAM: FOSSIL ELATERIDAE OF FLORISSANT. 509 



all of the species of Monocrepidius that I know are more strongly 

 striate and somewhat differently proportioned. 



ELATER ROHWERI, sp. nov. 

 Plate 3, fig. 5, 6. 



Form moderately elongate. Head rather short, distinctly but 

 finely punctured, somewhat sparsely on the sides and still more finely 

 and sparsely on the vertex, minutely hairy. Antennae quite slender, 

 scarcely at all serrate, not reaching the tips of the prothoracic hind 

 angles, basal joint large, second and third not well defined, the re- 

 mainder subequal, all finely hairy. Prothorax strongly narrowed 

 anteriorly, front margin arcuately emarginate, anterior angles not 

 very prominent, sides moderately arcuate, hind angles long, sharp, 

 a little divergent with distinct discal carina and possibly with an 

 external marginal one as well. The base is a little emarginate in 

 front of the scutellum. Thoracic disk with a well-impressed, smooth 

 median line on basal one fifth, the middle area finely and sparsely, 

 sides more strongly and closely punctate, entire surface hairy. Scutel- 

 lum oblong, punctured and hairy. Elytra bluntly pointed, tapering, 

 striae not deep, with rows of slightly elongate, rather fine punctures 

 separated in general by about their own long diameters, interstitial 

 spaces broad, flat, hairy, but not punctured excepting the small 

 depressions from which the hairs arise. Legs of moderate length, 

 finely hairy. Underside of body with most of the details not well 

 defined, but the prothoracic side-pieces are fairly strongly though not 

 densely nor coarsely punctured, the prosternum more finely. The 

 spine is pointed, the lobe broken at tip but apparently not long, the 

 sutures double, excavated, the metacoxal plates broad internally, 

 the abdomen finely hairy, scarcely punctulate. Length, from front 

 of head to elytral apex, 7.60 mm.; of elytron, 5.00 mm. 



Described from one specimen, with counterpart. 



Type. In the Museum of the University of Colorado. Florissant, 

 Colo., collected at Station 14 by Professor Cockerell and bearing 

 his numbers 192 and 211. 



The general features of this beetle point to Elater as a fairly exact 

 reference. It is most like some of the less strongly sculptured modern 

 North American species, such as E. sanguinipennis or E. behrensi, 

 but is rather smaller. Compared with the fossil E. scudderi, the 



