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-5- 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 |