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-10-

 

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