ROLAND HAY WARD. 213 



One of the best marked species of the genus. The only other 

 with which it can possibly be confused is ferrugineus Dej., from 

 which it differs by numerous structural characters of importance. 



For a long time it was known to me only by a somewhat mutila- 

 ted unique from Eastern Massachusetts, but through the kindness 

 of Mr. Charles Liebeck I have recently had an opportunity of 

 studying several other specimens, and to his generosity I am in- 

 debted for the only perfect examples in my cabinet. 



It has thus far been taken in Eastern Massachusetts, at Peeks- 

 kill, N. Y. and at Philadelphia, Pa. 



Group VI. ephippiatus. 



Form elongate. Head not inserted in the thorax to the eyes; 

 mentum with two large forameniform punctures behind the tooth ; 

 antenna? with the second and third joints subequal; Thorax with 

 the margin not translucent. Elytra rounded, distinctly striate, with 

 two small dorsal punctures on the third interval ; marginal stria 

 deep, entire. 



The anterior tarsi are similar in the sexes. 



This group is the equivalent of Pericompsus, a genus erected by 

 LeConte for the reception of T. ephippiatus Say.* As suggested by 

 Dr. Horn in his monograph of the Carabidse, f the characters on 

 which it is based are rather those of a group of species than of 

 generic value. The species composing it differ primarily from those 

 of the other groups by the deep marginal stria, which is not inter- 

 rupted or less deep at middle. The elytral strise are more numerous 

 than in most other Taehys, and in all our species are distinctly 

 punctate, a character of comparatively rare occurrence in the genus. 

 A larger number than usual are entire, so that the appearance of 

 the recurved sutural stria, so marked in nearly all the groups, is 

 here almost lost, the fifth being grooved at apex, as is usual in 

 Bembidium. 



Our three species may thus be separated : 



Thorax and elytra broadly margined, surface subopaque. 



Thorax nearly as long as wide, strongly narrowed behind, the anterior angles 

 slightly prominent and acute. Length .12-. 16 inch. . -sellatiis Lee. 

 Thorax and elytra narrowly margined ; surface shining. 



Convex; thorax slightly wider than long, distinctly narrower at base than 

 apex ; elytra very distinctly wider than the thorax, sides arcuate. 

 Length .10 -.13 inch eptli |»|>i;i t it* Say. 



* Ann. Lye, 1851-2, v, p. 191. 



f Trans. Am. Ent. Soc, 1881, ix, p. 134. 



TRANS. AM. ENT. SOC. XXVI. FEBRUARY, 1900. 



