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-558- 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