WickJiam — N&oo Fossil Flateridw from Florissant. 77 



Length (of entire insect) '96 in., of elytron about *60 in., of 

 protkorax abont "23 in. ; width of prothorax about '26 in. 



I place this insect in Corymbites from the general form ; 

 the shape of the prothorax strongly recalls that of C. carbo 

 Lee, and G. cereipennis Kby. 



One specimen (Cat. No. 1, Peabody Museum, Yale), Station 

 14 ; S. A: Kohwer. 



C.primitivus (figure 2). — Form rather stout, head finely and 

 rather closely punctured. Prothorax emarginate at apex, 

 front angles obtuse, sides broadly arcuate, more sharply in 

 front of the middle, the greatest width being at about one- 

 third of the length, hind angles distinctly carinate but rather 

 short and not strongly divergent ; disk finely densely subru- 

 gosely punctate, less closely along the middle. Elytra with 

 fine sharp impunctate strise, interstitial spaces finely irregu- 

 larly punctured. Legs and antennas invisible. 



Length, entire, '87 in., of elytron *50 in., of prothorax along 

 median line *20 in. ; width of thorax *23 in., of elytron about 

 •13 in. 



One specimen (Cat. No. 2, Peabody Museum, Yale), Station 

 13; Geo. N. Kohwer. 



Here, again, I have placed the species by its general appear- 

 ance, the truly generic characters all being obscured. 



3£elanactes Le Conte. 



M. cockerelli (figure 3). — Body moderately elongate. Head 

 narrower than thoracic apex, antennas attaining base of thorax, 

 basal joints obscured, the seven distal ones subequal in width 

 and but slightly serrate, each very little longer than wide, 

 front fairly closely but not coarsely punctured. Prothorax 

 slightly broader than long, narrowest at apex, arcuately wider 

 to a point a little behind the middle, thence slightly narrowed 

 to near the hind angles which are somewhat (but not markedly) 

 divergent, disk finely and closely punctate towards the sides 

 but much more sparsely and a trifle more coarsely about the 

 middle ; the marginal bead of the pronotum is very distinct, but 

 it is uncertain whether the hind angles are carinate or not. 

 Elytra apparently distinctly alutaceous, striate, the strise fine 

 and marked at their bottoms with rows of moderately deep 

 slightly elongate punctures which are separated by intervals 

 arranging approximately the lengths of the punctures. Legs 

 invisible. 



Length, entire, '91 in., width of prothorax, slightly behind 

 the middle, "26 in., of elytron '37 in. 



One specimen (obverse and reverse, Cat, No. 3, Peabody 

 Museum, Yale), Station 14; Mrs. W. P. Cockerell. 



