CARABIDAE: 1« 



Tribe II.— TRACHYPACHIXI. 



Antennae moderate, arising under a distinct frontal margin, 

 the joints all glabrous with a few hairs near the tip of each, first 

 joint stout but short, third very little longer than the second. 

 Eyes oval, not prominent, moderately distant from the buccal 

 fissure. Head deeply inserted in the thorax, with two supra- 

 orbital setae. Mandibles stout, arcuate, concave on the outer 

 side and with a setigerous puncture. Maxilla? with inner lobe 

 stout, falciform, ciliate and spinous within, outer lobe rather 

 stout, with two equal joints, palpi stout, the second and fourth 

 joints equal, the third a little shorter. Mentum short, broad, 

 with distinct suture at base, anteriorly feebly emarginate with an 

 emarginate tooth. Ligula broad, rounded and bisetose at tip, 

 the paraglossaj membranous, obtuse at tip, slightly longer than 

 the ligula, the palpi short, the second joint with one seta in front, 

 the third elongate-oval. Thorax with three setigerous punctures 

 at the sides. Body not pedunculate, scutellum distinct. Elytra 

 not margined at base, sides narrowly inflexed. Presternum hori- 

 zontal at tip prolonged behind the cox^e, the coxal cavities open 

 behind, prosternal sutures indistinct. Mesosternum oblique and 

 with a carina in front between two fossae which receive the ante- 

 rior coxae. Metasternal epimera invisible, the posterior coxae 

 contiguous within and reaching the side of the body separating 

 the metasternal side pieces and the abdomen. Legs not long, 

 femora stout, middle and posterior tibiae spinous externally, ante- 

 rior tibiae spinous posteriorly, gradually stouter to tip, sulcate 

 and feebly emarginate, the inner spur above the tip. 



The anterior tarsi of the male have two joints feebly dilated 

 and spongy pubescent beneath. 



This tribe contains two genera Trachypachys and Systolosoma, 

 the former occurring in our fauna and Europe, the latter in Chili. 



The characters above given show such an apportionment of 

 those peculiar to the sub-family, with the addition of one not 

 found in any of the tribes of Carabidee, that it is difficult to say 

 in which direction the affinities are most marked, but those 

 toward the Nebriini and Elaphrini seem to be the most evident. 



The form of the posterior coxae is the character more especially 

 noteworthy in this tribe. These members are not of unusual 

 dimensions but extend to the margin of the body; their line of 

 contact with each other is also greater than is usual in the entire 

 family. 



Two species of Trachypachys occur in our fauna, T. inermis 

 Motsch. distributed from the Hudson Bay region to New Mexico, 

 and T. Gibbsii Lee. in Washington Territory and Oregon. 



