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-13- Key to the Genera of Xanthopyginae 1. Last segment of labial palpus hemispherical. . . . . . . . Tympanophorus Nordmann Last segment of labial
palpus sub cylindrical . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . .. 2 2(1). Middle coxae widely separated. . . . . .. . . .. . . . . . . . . . . . . . . . . . .. . .Creophilus Leach Middle coxae contiguous . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . 3 3 (2). Elytra dehiscent, sutures overlapping. . . . . . . . . . . . . . . . . . . . . .Thinopinus LeConte Elytra not dehiscent,
sutures not overlapping. . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .. 4 4(3). Infraorbital ridge absent; foreparts impunctate. . . . . .
. . . . . . . . . . . . . Hadrotes Mäklin Infraorbital ridge
present; foreparts coarsely punctate. . . . . . . . . . . Xanthopygus Kraatz A specimen from Texas, which fits well the description of Trigonopselaphus
subcoeruleus
LeConte, has the anterior tarsus very
narrowly dilated whereas both Nordmann and Erichson describe it as being
greatly dilated in that genus. Alfred
Newton has examined the type of subcoeruleus and has expressed the opinion (personal
communication, Ian Moore & E. F. Legner) that it is not congeneric with Trigonopselaphus. Consequently, that genus is not included
in the above key as probably not being found in this region. The genus to
which subcoeruleus
belongs has not been determined. Key to the Genera of Staphylininae 1. Superior lateral line of pronotum not deflexed in front so that the
large lateral setigerous puncture is on it or
separated from it at most by little more than the width of the puncture. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .. 2 Superior lateral line of
pronotum deflexed in front so that the large lateral setigerous puncture is distant from it by at
least three times the width of the puncture . . . . . . . . . . . . . . . . . . . .4 2(1). Last segment of labial palpus not or very little narrower than
pen-ultimate, subfusiform or acticulate; anterior
tarsus usually with pale spatulate setae beneath. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .Philonthus Stephens Last segment of labial
palpus narrower than penultimate, cylindrical; tempora longer than eyes, subparallel;
pronotum elongate. . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .. .. 3 3(2). Anterior tarsus broadly dilated, with pale spatulate setae
beneath; pronotum with a series of four discal
punctures each side of mid-line . . . . . . . . . . . . . . . .Gabronthus Tottenham Anterior tarsus not
dilated; without pale spatulate setae beneath; pronotum with a series of five discal punctures
each side of mid-line. . . .
. . . . . . . . . . . . . . . . . . . . Gabrius Curtis 4(1). Prosternum not carinate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . 5 Prosternum strongly
longitudinally carinate. . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . 10 5(4). Basal impressions of basal tergites not more coarsely punctured
than rest of tergite. . . . 6 Basal
impressions of basal tergites much more coarsely punctured than rest of tergite . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . Neobisnius Ganglbauer 6(5). First segment of posterior tarsus as long as last segment.. ... . . . . . . . . . . . . . . . . . ... 7 First segment of
posterior tarsus shorter than last segment . . . . . . . . .Erichsonius Fauvel 7 (6) . Anterior
tarsus dilated (second segment wider than long), with dense pale spatulate setae beneath. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . 8 Anterior tarsus
slender (second segment longer than wide); without pale spatulate setae beneath; posterior
femora of male usually spinose beneath. . . . .Belonuchus Nordmann |