Juneigoo.] CaSEY; On NORTH AMERICAN COLEOPTERA. 65 



The genus Glceosoina, of Wollaston, occurring in the Island of 

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

 altogether distinct, not only in its lo-jointed antennae and type of 

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

 Gkvosoina taking refuge under stones and running with great velocity 

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

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

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

 Rvpobiiis ve/ox, differs from the true Rypobiiis also in the elytral 

 epipleurje, 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 antennas 

 with certainty in this example. 



The two species of Rypobiiis before me may be distinguished very 

 readily as follows : — 



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

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

 alutaceous. Length 1. 0-1.2 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 mfescent ; legs, an- 

 tenuK and ti'ophi flavate, polished, the micro-reticulation of the upper surface 

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

 o 5 mm. Texas (Columbus) minutus, sp. nov. 



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

 next three combined. Miiiiitiis must bear some resemblance to the 

 Central ^VL\Qx\z2iXv guatemalcnsis Matth., but differs in sculpture. 



Eutrilia, gen. nov. 

 The single representative of this genus resembles a very large, 

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

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

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

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

 any trace of epipleurre, 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 Orfliopenis. 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 



