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Last segment of maxillary palpus not narrower than penultimate labrum rounded, dentate. .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . .Fenderia Hatch

This key follows Moore and Legner (1979) which study also gives full generic descriptions and an illustration of a member of each genus.

Key to the Genera of Piestinae

1. Anterior tibia not spinose externally. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. 2

Anterior tibia not enlarged, not or feebly spinose. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 2

2(1). Pronotum and elytra costate; last segment of maxillary palpus not narrower than

penultimate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Pronotum and elytra not costate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3(2). Gular sutures widely separated near base. . . . . . . . . . . . . .. . . . . . . . . .Asemobius Horn

Gular sutures very approximate near base. . . . . . . . . . . . . . . . . . . . .. .Zalobius LeConte

4(2). Last segment of maxillary palpus not narrower than penultimate. . . . . Trigonurus Mulsant

Last segment of maxillary palpus much narrower than penultimate. . . . Charhyphus Sharp

5(1). Elytral disc without impressed striae. . . . . . . . . . . . . . . . . . . . . . . . .Hypotelus Erichson

Elytral disc with impressed striae . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6 (5). Clypeal area delimited by a deeply impressed line; mesosternum carinate. . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Piestus Gravenhorst

Head without such a line; mesosternum not carinate . . . . . . Siagonium Kirby & Spence

This key is from the study by Moore and Legner (1973) in which a detailed description of each genus and an illustration of a member of each genus are given.

The name Charhyphus Sharp in place of Trigites Handlirsch is used here following Herman (1972a). Herman pointed out that the members of the genus had some characters in common with the genotype of Phloeocharis and consequently removed the genus to Phloeocharinae. For purposes of identification, we are retaining the genus in Piestinae where it goes in our key to the subfamilies.

Key to the Genera of Proteininae

1. Pronotum with a central longitudinal groove. . . . . . . . . . . . . . . . . . . . . . .Megarthus Curtis

Disc of pronotum evenly convex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2 (1) . Pronotum not narrowed behind. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Proteinus Latreille

Pronotum strongly narrowed behind. . . . . . . . . . . . . . . . . . . . Vellica Casey (Omalinae)

[ Vellica is a member of Omaliinae which lacks ocelli. It is included in this key for purposes of identification.]

Pseudopsinae

This subfamily comprises the single genus Pseudopsis Newman

Key to the Genera of Xantholininae

1, Elytra overlapping at suture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 3

Elytra not overlapping at suture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2(1). Pronotum with five or more discal punctures each side. . . . . . . . . . . . . ..Parothius Casey

Pronotum with one discal puncture each side. . . . . . . . . . . . . . . Atrecus Jacquelin du Val