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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