106 GEO. H. HORN, M. D. 



seems to be carried to such an extreme in the present sub-family that 

 tribes may be separated containing one or at most two genera, except in 

 the Scaritini and possibly the Migadopidae as defined by Chaudoir. 



Tribe II.— Trachypachini. 



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 setse. Labrum short, broadly but feebly emarginate. Mandibles stout, 

 arcuate, concave on the outer side and with a setigerous puncture. Maxillse 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 paraglossse 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, the first at apical angle, the 

 second at middle, the third at basal angle. Body not pedunculate, scutellum 

 distinct. Elytra not margined at base, sides narrowly inflexed, margin not in- 

 terrupted. Prosternum horizontal at tip prolonged behind the coxae, the eoxal 

 cavities open behind, prosternal sutures indistinct. Mesosternum oblique and with 

 a carina in front between two fossse which receive the anterior 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, anterior 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 feeblj' dilated and spongy 

 pubescent beneath. 



This tribe contains two genera Trachypachys and Syslolosoma, 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 Carabidas, 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. As in all the other tribes of the present 

 sub-family the affinities seem to be complex, and will appear stronger or 

 weaker in accordance with the standpoint from which we view them. 



The form of the posterior coxae is the character more especially note- 

 worthy 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. 



In the Berlin Zeitschr, 1860, p. 166, Schaum states that Trachypachys 

 has three spurs to the anterior tibiae, two terminal and one above the 

 emargination, and on p. 167 the same is said of Metrius. From my 



