AMERICAN COLEOPTERA. 273 



basal impressions deep, lateral margin wider posteriorly. Elytra oblong oval, 

 wider tban tbe thorax, base truncate, bumeri obtuse, tbe margin serrulate, disc 

 finely striate, the striae slightly punctured at base and nearly obsolete at the sides, 

 the recurrent sutural stria rather deeply impressed. Tarsal claws small. Length 

 .16 inch; 4 millim. 



By its much broader thorax with the margin wider behind, this spe- 

 cies approaches Trechus more closely than any of the preceding species. 



One specimen $ , Ronald's cave, cabinet of Dr. LeConte. 



Of the species mentioned above I have seen a very large number of 

 Tellkampfi, five of interstifia/is, twenty of Menetriesi, seven of tenuis. 

 three of pusio, one of eremita, six of pubescens and one of audax. 



TRECHUS Clairv. 

 T. hydropicus n. sp.— Piceous shining, elytra iridescent, antennae and 

 legs pale. Thorax transverse, narrower at base, sides feebly arcuate anteriorly, 

 margin wider posteriorly, hind angles distinct but not prominent. Elytra broadly 

 oval, not more than one-fourth longer than wide, surface smooth, the three inner 

 striae alone distinct, the others obsolete. Body beneath smooth, shining. Length 

 .12 inch; 3 millim. 



This species is closely related to the California ovipennis, but is much 

 smaller and more convex, the eyes are much less prominent and very 

 feebly granulated. 



Collected by Mr. Ulke in Virginia. 



PSEUDOMORFIIA Kby. 



The occurrence of a new species gives me the opportunity to bring- 

 together a few notes on those previously described so that they may be 

 aptly compared. 



But one other species is known from North America (P. Pilatei, 

 Chaud., Yucatan), which is even smaller than excrucians and with the 

 parallel form of Behrensi and augustata. It is a very distinct species. 

 The type was kindly shown me by Mr. Rene Oberthur, its present owner. 



There are now known to us in our fauna four species of Pseudomor- 

 pha, which for convenience of determination may be arranged as follows : 



Elytra distinctly narrower posteriorly. 



Elytra with rows of coarse punctures forming nine quite regular striae, 



excrucnins Kby. 



Elytra nearly smooth, punctures obsolete < roiikli i I «-i Horn. 



Elytra parallel. 



Elytra with moderate punctures, very irregular on the disc, forming striae at 



the sides Behrensi Horn. 



Elytra with moderate punctures, confused on the disc, finer at the sides and 

 forming striae, in addition a row of large dorsal punctures 9 or 10 in num- 

 ber near the suture augustata Horn. 



P. excrucians Kby., Trans. Linn. Soc. 1825, p. 101, PI. 3, fig. 3.— The body 

 beneath and legs, head and thorax rufo-testaceous, elytra piceous. Head and 



TRANS. AMEIi. ENT. SOC. X. (C)9) JULY, 1883. 



