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3(1). Disc of pronotum impunctate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Disc of pronotum punctate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4(3). Head with discrete punctures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Saurohypnus Sharp

Head with punctures forming long coalescent grooves laterally . . . . . . .Gyrohypnus Leach

5(3). Pronotum with a few punctures arranged in series.... . . . . . . . . . . . . . . . . . . . . . . . . . .. 6

Pronotum with confused punctures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6(5). Superior lateral line of pronotum reflexed, joining inferior lateral line near middle. . . . . . . . 7

Lateral lines of pronotum separate to anterior angle. . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7(6). Last segment of maxillary palpus not shorter than penultimate . . . . . Nudobius Thomson

Last segment of maxillary palpus much shorter than penultimate. . . . . Oligolinus Casey

8(6). Middle coxae contiguous.. .. . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .Microlinus Casey

Middle coxae separate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

9(8). Second antennomere much shorter than third. . . . . . . . . . . . . . . . . .Lissohypnus Casey

Second antennomere not shorter than third. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10

10(9). Head coarsely punctured . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Head extremely finely and sparsely punctured. . . . . . . . . . . . . . . . . . Xestolinus Casey

11(9). Last segment of maxillary palpus stout at base, more than three-fourths as wide as apex

of penultimate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 12

Last segment of maxillary palpus slender at base, about one-half as wide as apex of

penultimate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .Leptacinus Erichson

12(11). Tempora not flattened behind eyes. . . . . . . . . . . . . . . . . ... .Megalinus Mulsant & Rey

Tempora with strong flattened area behind eyes . . . . . . . . . . . .Hyponygrus Tottenham

13(5). Last segment of maxillary palpus nearly as long as penultimate. . . . . . . . . . . . . . .. .. 14

Last segment of maxillary palpus much shorter than and narrower at base than

penultimate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

14(13). Second antennomere as long as third . . . . . . . . . . . . . . . . . . . . . . .Stictolinus Casey

Second antennomere as long as next three together. . . . . . . . . . . . Habrolinus Casey

15 (13) . Anterior tarsus dilated; head with dense longitudinally anastomic punctures. . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stenistoderus Jacquelin du Val

Anterior tarsus slender, head with discrete punctures. . . . . . . . . . . . . . . . . .. . . . .. 16

16(15). Prosternum carinate. . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .Hesperolinus Casey

Prosternum not carinate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

17(16). Head densely subopaquely punctured anteriorly on each side . . . . .Nematolinus Casey

Head not densely sub opaquely punctured. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 18

18(17). Head with strigulose and reticulate ground sculpture. . . . . . . . . . . . . .Leiolinus Casey

Head without ground sculpture . . . . . . . . . . . . . . . . . . . . . . . . . .Lithocharodes Sharp

This key is extracted from that of Moore (1963).

Key to the Genera of Paederinae

1. Anterior coxae closed behind, the prosternum expanded under them to the hypomera .. .. 2

Anterior coxae open behind, prosternum not expanded under the coxae. .. . . . . . . . . . . . 5