510 bulletin: museum of comparative zoology. 



present species may easily be distinguished by the distinctly striato- 

 punetate elytra, while E. fiorissantensis, from these shales, is larger 

 and has a differently formed prothorax. 



The specific name is given for Mr. S. A. Rohwer, a member of Profes- 

 sor Cockerell's expeditions and now of the U. S. National Museum 

 staff. 



Elater florissantensis, sp. nov. 



Plate 3, fig. 9. 



Form moderately elongate. Head large, closely and rather strongly 

 but finely punctured. Antennae poorly defined. Prothorax about 

 one seventh broader than long, wider near the apex than at base, 

 finely, deeply, and closely punctured, sides regularly and somewhat 

 faintly arcuate anteriorly, nearly straight posteriorly, front angles 

 obtuse, hind angles long, a little divergent and apparently bicarinate. 

 Scutellum oval. Elytra rather strongly tapering, apices conjointly 

 a little rounded, surface clothed with rather long but not close hairs 

 of a darker color, striae fairly coarse, their punctures of moderate size, 

 usually a little elongate and separated by less than their own long 

 diameters, interstitial spaces flat, scarcely visibly punctulate. Length, 

 from front of head to elytral apex, 8.25 mm. ; of elytron, 5.40 mm. ; 

 of prothorax, along median line, 2.00 mm. 



Described from one specimen. 



Tijpe — No. 2,752 M. C. Z. Florissant, Colo. (No. 8,034 S. H. 

 Scudder Coll.). With it are associated No. 2,753-2,758 M. C. Z. 

 (No. 79 and 103, 6,869, 8,891, 9,200 and 11,732 S. H. Scudder Coll.). 



The generic reference is only fairly exact. In thoracic outline the 

 fossil more nearly resembles our recent E. areolatus than any other 

 North American species known to me. The sculpture and vestitiu-e 

 of the elytra is something of the type seen in the living E. cordatus 

 from our Pacific coast. Unfortunately the outlines of the metacoxal 

 plates cannot be distinguished. 



Elater scltdderi, sp. nov, 



Plate 3, fig. 7, 8. 



Form rather elongate. Head quite closely and coarsely punctured. 

 Antennae incomplete, but when entire probably not reaching the 

 prothoracic hind angles. Prothorax very little wider than long. 



