Sub-Group 1.-LEBIE (genuine).

Head constricted behind; mentum not distinctly toothed, emargination more or less filled with a basal membrane;* palpi not dilated.

Tarsi dilated, spongy beneath;

Thorax truncate at base.

Thorax pedunculate.

Tarsi filiform; thorax broader behind, truncate.

PLOCHIONUS. LEBIA. NEMOTARSUS.

Of the last genus one species is found in the Southern and Western States, on flowers. The Lebiæ are found mostly on flowers, the Plochioni under bark. The ungues are serrate in our genera.

Sub-Group 2.-DROMII.

In these genera the head is not narrowed behind; the emargination of the mentum is filled with a basal membrane nearly concealing the tooth, when it exists; the palpi are usually acuminate, though the labial are sometimes thickened. Each genus, except Trechicus, which is confined to the Southern States, has representatives on both sides of the continent. The tarsi are filiform in all of our genera. The species are found under stones.

Middle tibiæ with small spines; ungues simple;

Palpi with last joint oval; third joint of antennæ glabrous.

TETRAGONODERUS.

Palpi with last joint conical; third joint of antennæ pubescent.

Thorax slightly lobed at the base; ungues more or less toothed;

Mentum not toothed.

Mentum with a small emarginate tooth.

BLECHRUS. METABLETUS.

Labial palpi thick, dilated; ungues more or less serrate. AXINOpalpus.

The species of Blechrus and Metabletus are very small, shining, black insects, and were confounded together by me under the name

*This basal membrane is the anterior portion of the mentum, which is rarely seen in Carabidæ, but is very obvious in many of the following families.

Bomius. Trechicus was formerly placed by me in Harpalini, but the paraglossæ are connate with the ligula, and the anterior tibiæ are not at all thickened or spinous; it differs from all the other genera of this tribe known to me by the second joint of the antennæ being equal to the third, which is pubescent, and the eighth stria of the elytra anteriorly confluent with the ninth, as in certain Bembidia. The elytra are broadly rounded at the tip, and scarcely striate.

Sub-Group 3.-CYMINDES.

The mentum tooth is large and distinct, not obscured by a basal membrane; the head is not constricted behind; the labial palpi are more or less dilated and truncate, and the maxillary cylindrical, truncate; the fourth joint of the tarsi is triangular or bilobed.

These species are of larger size, and found under stones and bark; some species of Callida are also found on flowers.

Ungues serrate;

Thorax lobed at the base, labial palpi thick.

Thorax undulated at the base, labial palpi thick.*

Thorax truncate at base, labial palpi moderate;

Tarsi with the fourth joint emarginate;

APENES.

GLYCIA.

Labial palpi with the last joint dilated, body hairy. CYMINDIS.
Labial palpi with the last joint elongate, body glabrous.

Tarsi with fourth joint bilobed, body glabrous. Ungues simple, thorax truncate at base.

PINACODERA.

CALLIDA. PHILOTECHNUS.

The last genus is confined to the Pacific coast; Glycia to the central district; Cymindis is widely distributed; the other genera are represented only in the Atlantic district. Pinacodera is established by Schaum upon Cymindis limbata Dej. and its allies, and differs from Cymindis by the male having four joints of the anterior tarsi dilated, while in genuine Cymindis there are but three. Apenes is remarkable for the depth of the clypeal suture.

This sub-group osculates very closely with the Platynus group of the Pterostichini.

Motschulsky (Bull. Mosc., 1859, ii. 143) has proposed a genus Philophuga for Cymindis viridis Dej. and another Californian species. It is said to differ from Glycia by the bilobed fourth tarsal joint, and from Callida by the larger lobes of the mentum. I have not had an opportunity of seeing either of the species referred to by the author.

Group II.-Pericalli.

These are distinguished from genuine Lebiæ by the larger size of the labrum, which covers in great part or entirely the mandibles. The palpi are slender, and the tarsi filiform. Two genera are found in the Atlantic district:

Head constricted behind, thorax pedunculate.

Head not constricted behind, thorax truncate.

RHOMBODERA.

COPTODERA.

The mentum is toothed in both; in the second genus the ungues are serrate, in the first they have only a basal dilatation. Didetus Lec. is synonymous with Rhombodera.

Tribe VIII.-PTEROSTICHINI.

Ligula free at the extremity, with distinct paraglossa (except in one foreign genus); antennæ with three glabrous basal joints, the apex of the third rarely pubescent in foreign species. Head not contracted into a neck, though sometimes narrowed behind. Elytra obliquely sinuate at the apex, never truncate; the basal margin is distinct in all of our species, and forms an angle at the humeri. Anterior tibiæ either slender and scarcely spinous, or thickened and spinous at tip; anterior tarsi of the male with three dilated joints furnished beneath with squamiform papillæ.

Schaum includes in this tribe genera having the third joint of the antennæ partly pubescent, and less than three joints of the anterior tarsi of the male dilated (as Stenomorphus, Patrobus, &c.). By admitting these, however, it becomes impossible to fix distinct limits to the tribe, and I have therefore removed these heterogeneous elements to form other tribes, to be found below. According to the form of the anterior tibiæ, two groups may be formed of our genera:

PLATYNI.

Anterior tibiæ slender, dilated joints of the tarsi narrow.
Anterior tibiæ thickened at the extremity, dilated joints of the tarsi tri-
angular or cordate.
PTEROSTICHI.

Group I.-Platyni.

By the slender form of the antennæ and legs this group osculates with the last members of the first group of Lebiini. And this resemblance is further increased by the occurrence of serrate ungues in some members of the present group.

I have combined Pristodactyla Dej. with Calathus, and Anchus Lec. with Platynus, the differences becoming evanescent by the comparison of many species. Colpodes should probably not be separated from Platynus;* the characters are by no means distinct. The species are quite numerous, and found under stones, mostly in moist places.

Our genera, as thus reduced, are as follows:-
:-

Tooth of the mentum emarginate; ungues more or less serrate.

CALATHUS.

Tooth of the mentum entire; ungues simple;

Third joint of the antennæ very long.

RHADINE.

Third joint of the antennæ moderate;

Fourth joint of the tarsi emarginate, with long apical hairs, at least

The anterior tibiæ are gradually thickened towards the apex, and armed externally with small spines. The ungues are always simple. The anterior tarsi of the male have the three dilated joints triangular or cordate, sometimes (Loxandrus) oblique, as in Galerita. The characters separating the genera are of but slight importance, and in several (Lophoglossus, Holciophorus, and Loxandrus) depend upon sexual peculiarities of the male. Although the species of Amara would never be confounded with Pterostichus by a practised eye, there is no difference capable of being used in a synoptic table for the purpose of distinguishing the two genera. For this reason the assemblage of characters common to all species of Amara, but which are only individually present in some species of Pterostichus, must be used. They are given below. According to the latest researches, Poecilus cannot be retained separate from Pterostichus.

MYAS.

Mentum tooth emarginate, last joint of palpi dilated.
Mentum tooth emarginate, last joint of palpi cylindrical (rarely oval);
Episterna of metathorax short; elytra with one dorsal puncture; pro-
sternum not margined, but channelled.
EVARTHRUS.

This genus is called Anchomenus by most foreign authors. I have detailed in other places the reasons which induce me to retain the name here adopted.

Episterna of metathorax variable; elytra with none or several dorsal

punctures ;*

Ligula flat or slightly convex; prosternum not channelled, sometimes margined. PTEROSTICHUS.

Ligula carinate; episterna of metathorax elongate; prosternum not margined nor channelled. LOPHOGLOSSUS.

Ligula carinate; episterna of metathorax short; prosternum margined and channelled. HOLCIOPHORUS. Mentum tooth obtuse, scarcely concave; palpi slender, last joint cylindrical; episterna of metathorax elongate; elytra with one dorsal puncture. LOXANDRUS. Mentum tooth emarginate, rarely entire; head not at all narrowed behind; labrum slightly emarginate; last joint of palpi slightly oval; elytra without dorsal punctures. AMARA.

Tribe IX.-LICININI.

The paraglossa in this tribe are variable in form, sometimes (Badister) entirely connate with the ligula, sometimes (Diplochila, Dicælus) free at the apex. The head is large and obtuse; the labrum is emarginate, and deeply impressed; the mandibles are obtuse. Three basal joints of the antennæ are smooth (the third is slightly hairy in some species of Badister, but not rough like the following joints). The anterior tibiæ are somewhat thickened and spinous at the tip; the anterior tarsi of the male have three (in some foreign genera only two) joints strongly dilated, covered beneath with a dense brush of hair. The elytra are slightly and obliquely sinuate at the apex; one dorsal puncture is seen on the third interval. The body is never hairy.

In our genera the clypeus is divided into an anterior subcoriaceous, and a posterior corneous portion, and the mentum is not toothed.

Last joint of palpi oval;

Paraglossæ connate with the ligula, and longer than it.

Ligula free at the apex.

Last joint of palpi slightly securiform.

BADISTER.

DIPLOCHILA.

DICÆLUS.

The species of the first genus are small, frequently prettily spotted insects, found under stones; they are rare, and occur on both

* Except in Pterostichus honestus (Fer. fastidita Dej.), in which a single dorsal puncture is seen. This species is, however, of the same form as P. adoxus, and would not be confounded with the very characteristic forms of any of the groups of Evarthrus.