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24(23). Disc of head punctate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Orus Casey

Disc of head impunctate . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paederopsis Wasmann

25(23). Elytra without pleural fold. . . . . . . . . . . . . . . . . . . . . . . . . . . .Lathrobium Gravenhorst

Elytra with pleural fold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

26(25). Pronotum moderately sparsely punctured. . . . . . . . . . . . . .Lobrathium Mulsant & Rey

Pronotum sub glabrous, subimpunctate, highly polished. . . . . . . . . . . . . . . . . . . . .. 27

27(26). Abdomen very sparsely punctured; labrum strongly bidentate. . . . . Acalophaena Sharp

Abdomen very densely punctured; labrum edentate. . . . .. . . . . . Dacnochilus LeConte

This key is extracted from that of Blackwelder (1939) which is an example of an excellently organized and highly useable key. The characters employed are almost all readily visible in typical museum specimens, and they are stated simply and clearly. The genus Xenomedon Fall is omitted. It goes to Sunius Curtis in our key. The original description gives no clue as how to distinguish it from that genus.

Key to the Genera of Diochinae

1. Gular sutures converging behind. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diochus Erichson

Gular sutures diverging behind. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ophioomma Notman

[Ophioomma is included provisionally on the basis of the original description.]

Key to the Genera of Quediinae

1. Tarsal formula 5, 5, 5; maxillary and labial palpi not conspicuously elongate. . . . . . . . . . ... 2

Tarsal formula 5, 4, 4; maxillary and labial palpi conspicuously elongate; general appearance

of Tachyporus Gravenhorst . . . . . . . . . . . . . . . . . . . . . .. . . . . . .Atanygnathus Jacobson

2 (1) . Dorsum of tarsal segments setaceous; empodial seta slender, short, hardly visible

between claws, considerably shorter than claws. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3

Dorsum of last four tarsal segments of middle and posterior legs smooth, without setae

except for long bristles at distal margins; middle and posterior empodial setae long,

distinctly protruding between claws, nearly as long as or longer than claws. . . . . . . .. .. 4

3 (2). Last segment of maxillary palpus subulate, shorter than penultimate . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heterothops Stephens

Last segment of maxillary palpus not subulate, not shorter than penultimate . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Quedius Stephens

4(2). Antenna not geniculate, first segment not longer than next two combined; anterior claws

not longer than others. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5

Antenna geniculate, first segment elongate, usually as long as next four combined;

anterior claws longer than others. . . . . . . . . . . . . . . . . . . . . . . . Acylophorus Nordmann

5(4). Anterior tibia not spinous externally, without a long spur at inner front angle, head densely

coarsely punctured laterally. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hemiquedius Casey

Anterior tibia spinous externally, with a long spur at inner front angle; head not densely

coarsely punctured laterally. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anaquedius Casey

This key is slightly modified from Smetana (1971), who gave a full description and an illustration of each genus.