j U nei 9 oo.] Casey: On North American Coleoptera. 65 



The genus G/ceosoma, of Wollaston, occurring in the Island of 

 Madeira, which has been considered to be identical with Rypobius, is 

 altogether distinct, not only in its io-jointed antenna; and type of 

 elytral sculpture, but in its habits and gait, the single species of 

 Glceosoma taking refuge under stones and running with great velocity 

 when disturbed — habits wholly foreign to Rypobius. It may however 

 be placed near Rypobius in a tabular arrangement of the genera of the 

 family. A Spanish specimen sent me by Mr. Reitter under the name 

 Rypobius velox, differs from the true Rypobius also in the elytral 

 epipleurae, which are inclined upward and not at all inflexed, and also 

 in the hind angles of the prothorax, which are acute and sensibly pro- 

 duced posteriorly. I am unable to count the joints of the antennae 

 with certainty in this example. 



The two species of Rypobius before me may be distinguished very 

 readily as follows : — 



Base of the prothorax almost rectilinear, piceous, the prothorax and under surface 

 paler ; micro-reticulation of the upper surface very deep, the lustre somewhat 

 alutaceous. Length I. o-i. 2 mm.; width 0.7-0.85 mm. Rhode Island, New 

 Jersey and Virginia (near the ocean beaches) marinus Lee. 



Base of the prothorax distinctly bisinuate, blackish, the pronotum rufescent ; legs, an- 

 tennae and trophi flavate, polished, the micro-reticulation of the upper surface 

 almost completely effaced ; size very much smaller. Length 0.6S mm. ; width 

 0.5 mm. Texas (Columbus) minutus, sp. nov. 



In both these species the first abdominal segment is as long as the 

 next three combined. Minutus must bear some resemblance to the 

 Central American guatemalensis Matth., but differs in sculpture. 



Eutrilia, gen. nov. 

 The single representative of this genus resembles a very large, 

 broadly oval Orthoperus, and is evidently very closely related, being 

 identical in the form of the prothorax and in the structure of the head, 

 coxa? and under surface. It however differs in the form of the an- 

 terior tibiae, as indicated in the table, and in the virtual absence of 

 any trace of epipleurae, these being indicated only by a slight thicken- 

 ing of the elytral margins due to the very minute marginal bead. The 

 meso-coxal plate is rather well developed, but the metacoxal plate is 

 extremely short as in Orthoperus. The intermediate tibiae are slightly 

 thickened externally just beyond the middle with arcuate outline, the 

 posterior straight and the tarsi slender, the claws small, arcuate and 

 very slender. The first ventral segment is as long as the next four 



