ART. 13. DESCRIPTIONS OF FOSSIL INSECTS — COCKERELL. 11 



352 broad. The club is very well preserved and is positively not 

 divided. 



Horizon and locality. — Green River Eocene, head of East Alkali 

 Gulch, about 8 miles south of De Beque, Colorado, 1922. (John P. 

 Byram.) 



Holotype.—C^i. No. 69181, U.S.N.M. 



Compared with the modern (European) A. crassicornis (Rossi), 

 the second antennal joint is shorter, and the tliird is much longer in 

 proportion to the fourth, while the club is broader basally. Possibly, 

 if we had the wings, it might be necessary to describe a new genus, 

 but so far as the specimen shows it may well go in Amasis. The 

 genus Amasis consists to-day of 17 species and some named varieties, 

 occupying the Palaearctic region from Siberia to Marocco and 

 France. Amasis dilatata Lepeletier and A. sicbflavata Kirby, de- 

 scribed from Brazil and Argentine, respectively, are referred b\ 

 Konow to the related genus Plagioceros Klug. In 1909 Mocsarj 

 described A. hrasiliensis from Brazil and A. neotropica from Para- 

 gnsij. The distribution is somewhat analogous to that of the Came- 

 lidae, and fossil Am^asis in America might have been expected. 



Another specimen of A. hyrami., from the same place, is 9.5 mm. 

 long. 



HOPLISUS ARCHORYCTES Cockerell. 



Plate 1, fig. 5. 



This remarkable specimen, described in Nature,^ was found by Mr. 

 John Byram in the Green River shales at the head of Bear Gulch, 

 Colorado. As the figure shows, it is entirely of a modern type, in 

 spite of its great antiquity, no older wasp being known. For the 

 origin of the Fossores we must evidently go back to the Mesozoic. 



Holotype.—C2it. No. 69182, U.S.KM. 



COLEOPTERA. 

 Family MORDELLIDAE. 



MORDELLA PRISCULA, new species. 



Plate 1, fig. 7. 



Length about 3 mm. ; robust, dark brown, the elytra somewhat 

 paler, without spots, but with the sutural margin darkened, in the 

 manner of Mordellistena granimica LeConte; caudal style of mod- 

 erate length (rather over half a millimeter), not very slender; legs 

 reddish-brown; hind tibiae with a single well-developed dark ridge 

 close to and parallel with the broad margin; hind tai^si formed as 



« Sept 2, 1922, p. 313. 



