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-11-

 

2(1). Fourth tarsomere simple. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Echiaster Erichson

 

        Fourth tarsomere bilobed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

 

3 (2). Prosternum conate with the edges of the hypomera . . . . . . . . . . . . . . . . . . . . . . . . . .. 4

 

         Prosternum not conate with the edges of the hypomera . . . . . . . . . . . . . Astenus Dejean

 

4(3). Pronotum narrowly prolonged at the middle in front. . . . . . . . . . . . . . Stamnoderus Sharp

 

        Pronotum not distinctly prolonged in front. . . . . . . . . . . . . . . . . .  . . . Stilicopsis Sachse

 

5(1). Last segment of maxillary palpus truncate, compressed and pubescent. . . . . . . . . . . . . .

        . . . . . . . . . . . . . . . . . . .  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Paederus Fabricius

 

       Last segment of maxillary palpus narrow, elongate and glabrous. . . . . . . . . . . . . . . . . .. 6

 

6 (5). Antenna anteriorly flexile, first segment as long as next three together, sinuate at apex

         anteriorly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

 

        Antenna not anteriorly flexile, first segment usually shorter than next three together,

        sinuate at apex posteriorly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .. 10

 

7(6). Elytra with a pleural fold. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

 

        Elytra without a pleural fold. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9

 

8(7). Marginal carina of pronotum interrupted at middle.. . . . . . . . . . . . . . .  .Lissobiops Casey

 

        Marginal carina of pronotum entire. . . . . . . . . . . . . . . . . . . . . . .Homaeotarus Hochhuth

 

9(7). Labrum bidentate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ochthephilum Stephens

 

        Labrum edentate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Biocrypta Casey

 

10(6). Neck one-fifth to one-eighth as wide as head. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11

 

         Neck one-fourth or more as wide as head. . . . . . . . . . . . . .  . . . . . . . . . . . . . . . . . .. 16

 

11(10). Gular sutures separate.. ... ... ... . . . . . . . . . . . . . . . . . ... . . . .. . .Scopaeus Erichson

 

           Gular sutures united at least basally . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

 

12(11). Head coarsely umbilicately or elongately punctured, without dense ground sculpture. .13

 

           Head not or indistinctly umbilicately punctured, with dense ground sculpture . . . . . . .15

 

13(12). Head very densely punctured 14

 

           Head not very densely punctured. . . .. ... . . . . . . . . . . . . .  ... ... .Acrostilicus Hubbard

 

14(13). Head and pronotum very differently punctured. . . . . . . . . . . . . .. . .Pachystilicus Casey

 

           Head and pronotum very similarly punctured. . . . . . . . . . . . . . . . . . . . . Rugilus Leach

 

15(12). Elytra with short stiff erect bristles. . . . . . . . . . . . . . . . . . . .  . . . .Megastilicus Casey

 

           Elytra with normal pubescence. . . . . . . . . . . . . . . . . . . . . . .. . . . . . Stilicolina Casey

 

16(10). Sculpture of head and pronotum dense ... . . . . . . . . . . . . . . . . . . . . . . . . . . .  ... ... 17

 

           Sculpture of head and pronotum sparse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 23

 

17(16). Antenna slender, verticilate from third segment. . . . . . . . . . . . . .  . Thinocharis Kraatz

 

           Antenna not slender, not verticilate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

 

18(17). Disc of head without umbilicate punctures. . . . . . . . . . . . . . . .. . . . Lithocharis Dejean

 

           Disc of head with umbilicate punctures. . . . . . . . . . . . . . . . . . .  . . . . . . . . . . . . . .. 19

 

19(18). Labrum with median tooth or prominence .. . .. .. . . . . . . . . . . . . . . . . . . . . . . .. . ... 20

 

           Labrum without median tooth or prominence. . . . . . . . . . . . . . . . . .. . . . . . . . . . . .. 21

 

20(19). Umbilicate punctures of head sparse and not strong . . . Achenomorphus Motschulsky

 

           Umbilicate punctures of head dense and strong. . . .. . . . . . . . . .  . . Stilomedon Sharp

 

21(19). Gular sutures united in great part. . . . . . . . . . . . . . . . . . . . . . . . . . .Neomedon Sharp

 

           Gular sutures separate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22

 

22(21). Gular sutures distinctly diverging from before the middle to apex. . . . . . .  Sunius Curtis

 

           Gular sutures most approximate along the middle.. . . . . . . . . . . . . . .Medon Stephens

 

23(16). Anterior tarsus slender . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .    24

 

              Anterior tarsus dilated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .. .    25