290 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.45. 



moderate in length, rather slender. Sculpture of head, prothorax, 

 and abdomen, as far as shown, almost uniform, consisting of a fine, 

 microscopic, not very close punctuation with a clothing of short fine 

 hairs. Length, 6.25 mm. Width across elytra, 1.25 mm. 



Type.— C&t. No. 59638, U.S.N.M. 



This finely preserved insect can not be referred to any of the species 

 described by Scudder. It is absolutely unlike his LitJiocTiaris scottii, 

 the antennae alone serving to differentiate the two. Only a single 

 specimen is known. 



Genus LITHOCORYNE Scudder. 



LITHOCORYNE ARCUATA, new species. 

 Plate 24, figs. 3, 4. 



Resembles L. gravis from the Florissant shales, but differs in size, 

 sculpture, and the form of the prothorax. General shape similar to 

 that of L. gravis, prothorax with the perfect side regularly arcuate 

 throughout, the front angles prominent and sharp. Head distinctly 

 closely and subconfluently but not deeply punctured, the prothorax 

 at sides similarly but somewhat more strongly punctured, the median 

 area much less distinctly and more finely so. Elytra with the basal 

 area less strongly punctured than the thoracic sides, the punctures 

 forming vague series but fading out toward the apex. Length, 4.75 

 mm. Width across the elytra at middle, 2 mm. 



Type.— Cat. No. 59639, U.S.N.M. 



One specimen. A comparison of the figure of this species with the 

 figure and description of L. gravis will show several differences. The 

 pro thoracic side is regularly arcuate in L. arcuata, but nearly straight, 

 except near the apex, in L. gravis. The sculpture is different, since 

 Scudder describes the prothorax of his species as being covered with 

 minute but not crowded nor prominent granulations. If his example 

 were a reverse, this would mean that the punctuation of that part, in 

 the obverse, would be rather fine and well separated, while in L. arcuata 

 it is rather coarse and very much crowded. There is a very serious 

 discrepancy between the description and figure of the antennae m 

 Scudder's work, but I have assumed the former to be correct, in which 

 case the antennae of L. gravis and L. arcuata are similar excepting the 

 proportions of the club joints. In my species the terminal articula- 

 tion is truncate, possibly due to distortion. 



Genus CRYPTOPHAGUS Herbst. 



CRYPTOPHAGUS BASSLERI, new species. 

 Plate 24, figs. 1, 2. 



Preserved in ventral view. Form rather short, head broad, 

 antenna 11-jointed, the first joint large, second and third narrower 

 and successively shorter, fourth to seventh subequal, submoniliform, 

 shorter than the third, eighth apparently partially decomposed, 



