136 GEO. H. HORN, M. D. 



The group Trechi contains in our fiiuna two genera which have the 

 second joint of the antennae somewhat pubescent, they are as follows : 



Head with distinct eyes. Anterior tibiae slightly broader to tip, the emargination 



extending nearly to the middle of the tibia TreclillS. 



Head without eyes. Anterior tibipe slender, the eniarginatioji at apical third. 



Anophtlialmus. 



Our species of the latter genus may be divided in two series, the first 

 contains Tellkampfii in which the last joint of the maxillary palpus is 

 very distinctly shorter than the penultimate, the second comprises all our 

 other species with the same joint equal to or even a little longer than 

 the preceding. 



The tribe Pogonini of the present essay is about the same as that 

 intended by Lacordaire, (Glenera i, p. 364), less the genera which have 

 been properly removed by Schaum and others. The latter author 

 however, separates the two groups and places the Pogoni among the 

 Pterostichiui rendering that tribe heterogeneous and indefinable while 

 the Trechi are found near Bembidiini. 



I believe that Lacordaire and LeConte are correct in approximating 

 the Pogoni and Trechi but I do not think the characters separating them 

 are of tribal value. That they should be placed near Bembidiini as these 

 authors have done seems to me proper while the relationship of the 

 Pogoni with Pterostichus is much less evident. The structure of the 

 ligula and paraglossae varies but little between the Pterostichiui, Patro- 

 bini and Bembidiini. 



The suture between the mentum and its support is often entirely obliter- 

 ated especially in Anophthalmus, and is very indistinct in" some Patrohus 

 although sufficiently marked in others, and in nearly all Treclms. 



To this tribe and closely related to the Trechi I would refer the*genus 

 Ooptems. Lacordaire places the genus in his Cnemacanthides, the 

 Broscides of other authors, but Putzeys in his monograph rejects it. 

 Guerin-Meneville in the origin placed it among the subulipalpi and was 

 more nearly correct than LaQordaire. Ooptertis has all the essential 

 characters of the group Trechi even to the impressed and recurrent 

 stria and it seems to indicate a strong attempt to unite the Pogonini 

 and Bembidiini. 



Tribe XXIV.— Pterostichini. 



AntennsD arising under a distinct frontal ridge, the th!'ee basal joints glabrous. 

 Head more or less constricted behind the eyes, except in Amara, and with two 

 supra-orbital setigerous punctures, clypeus prolonged beyond the base of the 

 mandibles, the latter without setigerous puncture externally. Maxillae ciliate or 

 spinulose' within, hooked at tip (except Stomis and Agelcea), the palpi of moder- 

 ate length and uf variable structure. Mentum broad, of variable length, usually 



