506 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



CRYPTOHYPNUS EXTERMINATUS, sp. nov. 

 Plate 1, fig. 8, 9. 



Form short, broad, and stout. Surface hardly visibly punctate 

 anywhere, but this may possibly be due to the rather coarse texture 

 of the stone in which the specimen is preserved. Head rather large. 

 Antennae with the first joint long and thick, the second and third 

 scarcely shorter than those succeeding, none of which are much pro- 

 duced at the angles so that the organ is only weakly serrate. Pro- 

 thorax a little distorted, a trifle more than one third wider than long, 

 apex feebly emarginate, front angles pointed but obtuse, width great- 

 est in front of the middle, sides moderately strongly arcuate to a 

 point near the acute hind angles, slightly divergent and carinate, base 

 sinuate each side. Scutellum suborbicular. Elytra a little more 

 than twice the length of the prothoracic median line, pointed at apex. 

 Length, 4.55 mm. 



Described from one specimen. 



Type. No. 2,762 M. C. Z. Florissant, Colo. (No. 11,280 S. H. 

 Scudder Coll.). 



The form and antennal structure are those of Cryptohypnus. In 

 size, it approximates the recent C. nocturnus of Canada and our 

 northern states, but the sculpture, if properly shown on the stone, is 

 more like that of the much smaller C. pectoralis. This last species, 

 in its varieties, has a wide distribution in North America today. 



CRYPTOHYPNUS HESPERUS, sp. nov. 

 Plate 3, fig. 1. 



Form fairly slender for this genus. Sculpture of head not definable. 

 Antennae not well shown, but one side is well enough preserved to 

 indicate that they reached at any rate to the hind angles of the pro- 

 thorax. Prothoracic width about one fourth greater than the length, 

 surface sculpture obscurely preserved, base not much broader than 

 the apex, sides rather strongly rounding, hind angles short, not diver- 

 gent, base deeply sinuate each side. Scutellum rounded or oblong. 

 Elytra tapering, arcuate at sides, apices conjointly rounded, sculp- 

 ture not well defined, showing only traces of faint striae. Length, 

 from front of head to abdominal apex, 4.30 mm.; of elytron, 2.60 mm. 



