JOURNAL J}f\a JBork 6ln)l^oraologirflI %iiM^. \roL YIII. JUNE, 1900. No. 2. REVIEW OF THE AMERICAN CORYLOPHIDiE, CRYPTOPHAGIDiE. TRITOMID^ AND DER-MESTIDiE, WITH OTHER STUDIES. Bv 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 Groucviis 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. FOS.T Monroe, Va., December 14, 1S99. hydrophiijd.f:. Limnebius Leach. The minute species composing this genus 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
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