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-552- 17(16). Last segment of maxillary
palpus slender, parallel sided . . . ... .. . Microedus LeConte Last segment of maxillary palpus
fusiform. . . .
.. . . . . . . ... . . . . .Psephidonus Gistel 18(16). All antennomeres densely
pubescent .. . . .. . . . . . . .. . . . . . . .. . . . . . . . . . . ... .. 19 First four antennomeres glabrous except
for a few long setae. . .. . . . . . . .. . . . . . . . 20 19 (18). Penultimate segment of
maxillary palpus one-half longer than wide .. . .Artochia Casey Penultimate segment of maxillary
palpus not longer than wide .. . . .. . Lesteva Latreille 20(18). Second antennomere twice
as long as third .. . . . . . . .. . . . . . . .. ..Porrhodites Kraatz Second antennomere not longer than third. . . . . . .
. . . . . . . . . . . . .. . . . . . . .. . . .. 21 21 (20). First segment of
posterior tarsus one-half longer than second .. . . . . Acidota Stephens First segment of posterior
tarsus not or very little longer than second .. . . . . . . .. . .. 22 22 (21). Head with well-impressed
nuchal line; last segment of maxillary palpus seldom longer than penultimate. . . . . . . .. . . . . . . .. . . .
. . . .. . . . . . . .. . . . . . . . . . . . . . . . . . .. 23 Nuchal line absent or feeble; last segment of
maxillary palpus usually longer than penultimate. .. . . . . . . .. . . . . . . .. . . . .
. . .. . . . . . . . .. . . . . . . . . . . . . . . . . . . .. 26 23(22). Base of pronotum tumid,
reflexed . . .. . .. . . . . . . .. . .
... ... ... .Paradeliphrum
Hatch Base of pronotum not tumid, not reflexed . .. . . . .
. . .. . . . . . . .. . . . . . . .. . .. . . . .. 24 24(23). Tarsus with small
membranous pad at base of ungues .. . . . Anthophagus Gravenhorst Tarsus without pad at base of ungues. . .. . . . . . .
.. . . . . . . .. . . . . . . .. . . ... .. . ... 25 25(24). Last segment of maxillary
palpus not more than one-half longer than penultimate .. . . . . .. . . . . . . .. . . . . . . .. . . . . . . .. . . .
. . . .. . . . . . . .. . . . . . . .. .. ..Arpedium Erichson Last
segment of maxillary palpus more than twice as long as penultimate .. .. . . . . . . .. . . . . . . .. . . . . . . .. .
. . . . . .. . . . . . . .. . . . . . . .. . . . . . . .. . . . .Xylodromus Heer 26(22).Pronotum not widest at base
. . . ... .. .. . . . . . . .. . . . . . . .. . . . . . . .. . . . . . . .. .
... 27 Pronotum widest at base . . .. . . . . . . .. . . . . .
. .. . . . . . . .. . . . . . . .. . . . . ... .. . ... 31 27(26). Mesosternum carinate. .. .
. ... .. . . . .. . . . . . . .. . . . .. . . . . . .. . .Mathrilaeum Moore Mesosternum not carinate . . .. . . . . . . .. . . . .
. . .. . . . . . . .. . . . . . . .. . .. ... .. . ... 28 28(27). Gular sutures distinctly
separate. . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . .
. . .. 29 Gular sutures united or extremely approximate. . .. .
. . . . . .. . . . . Olophrum Erichson 29(28). Anterior ungues
asymmetrical, inner twice as long and more than twice as wide as outer, nearly as long as tarsus .. . . . . . . .. . .
. . . . .. . . . Xenicopoda Moore
& Legner Anterior
ungues symmetrical, of same size as middle and posterior ungues. . . . . . ..
30 30(29).
Head abruptly constricted behind eyes. . . . . . . . . . .. . . . . . .. . . . .Anthobium Leach Head not constricted behind eye; tempora longer than
eyes .. . . . . . .Orochares Kraatz 31(26). Head produced in a beak
which anterior to eyes is one-half longer than wide .. . . . . . . .. .. . . . . . . .. . . . . . . .. . . . . . . . . . .
. . . .. . . . . . . .. . . . . . . Tanyrrhinus Mannerheim Head anterior to eyes not longer than wide. . . .. .
. . . . . .. .. . Trigonodemus
LeConte 32(9). Elytra conjointly shorter
than wide.. .. . ... .. . . . . . . .. . . . . .. .Micralymma
Westwood Elytra conjointly not shorter than wide. . . . . . .. .
. . . . . .. . . . . . . . . . . . . . . . . . . . .. 33 33(32). Last segment of maxillary palpus
distinctly narrower than penultimate . . . ... .. . ... .. . . .. . . . . . . .. . . . . . . .. . . . . . . .. . . .
. . . .. . . . . . . .. . . . . . . . . . . Phloeonomus Heer Last segment of maxillary palpus not distinctly
narrower than penultimate . .. .. . ... 34 |