REVIEW OF THE AMERICAN CORYLOPHIDiE, 



CRYPTOPHAGIDiE, TRITOMIDiE AND DER- 



MESTID^E, WITH OTHER STUDIES. 



By Thos. L. Casey. 



The following pages record the results of a number of studies made 

 at various times during the year just coming to an end, and may pos- 

 sibly be of some service to collectors in arranging their cabinets. The 

 descriptions give only the salient characters of each species, and, in a 

 genus such as the corylophid Gronevus for example, wherein the spe- 

 cies mutually resemble each other very closely, can be appropriately 

 limited to the few apparent differential characters. Further elaboration 

 in such cases would prove to be largely repetition, and serve no really 

 useful purpose in the present preliminary outline sketches, which are 

 only intended to partially and imperfectly point the way. 

 Fort Monroe, Va., December 14, 1899. 



HYDROPHILIDJE. 

 Limnebius Leach. 

 The minute species composing this gej us have the body elongate- 

 oval and convex, the very small sparse punctures of the upper surface 

 bearing each a fine decumbent hair. The labrum is transverse, with 

 the apex sinuate at the middle. The inferior part of the eye is well 

 developed and prominent, with the individual facets convex, but the 

 superior part is not more convex than the frontal surface, with the 

 facets larger and perfectly flat. The antennae are partially received in 

 repose in a very narrow groove between the eyes and the buccal open- 

 ing, and, curving around the lower contour of the eyes, the club is 



