Cercopeus

O’Brien, Charles W., Ciegler, Janet C. & Girón, Jennifer C., 2010, Weevils of the genus Cercopeus Schoenherr from South Carolina, USA (Coleoptera: Curculionidae: Entiminae), Insecta Mundi 2010 (141), pp. 1-29 : 3-5

Key to known females of Cercopeus

1. Foretibia with small anteapical spine on outer margin ( Fig. 20 ); sides of pronotum evenly rounded ................................................................................................................................................... 2

– Foretibia without anteapical spine on outer margin; sides of pronotum various ....................... 4

2(1). Head in lateral view with tumidity above antennal insertion and above vertex, concave between tumidities; eyes placed more dorsally than usual, in lateral view close to dorsal margin (Fig. 27); length 3.2 mm; VA ............................................................................... C. simius Sleeper

– Head in lateral view with dorsal edge straight or evenly curved; eye placement normal; widespread in eastern U.S.......................................................................................................................... 3

3(2). Pronotum striolate, slightly tumid; larger, length 3.7-5.1 mm ............. C. strigicollis Sleeper

– Pronotum punctate, at most with weakly developed strioles, not tumid; usually smaller, length 3.3-4.3 mm .......................................................................................... C. chrysorrhoeus (Say)

4(1). Foretibia with outer apical margin markedly produced and acutely angulate ( Fig. 21 ), inner margin denticulate; length 3.9-4.9 mm ................................................................................... 5

– Foretibia with outer apical margin rounded or rectilinear, not or slightly produced ( Fig. 22 ); inner margin and length various ....................................................................................................... 6

5(4). Reddish brown; pronotum distinctly tumid in middle ...................... C. maspavancus Sleeper

– Dark brown; pronotum not tumid ................................................................... C. cornelli n. sp.

6(4). Pronotum with median carina or spine at middle of basal margin, many specimens with median longitudinal glabrous ridge or carina (Fig. 24); pronotum not markedly striolate ................. 7

– Pronotum simple, without median spine, glabrous ridge, or carina; pronotum striolate or not ... ................................................................................................................................................ 10

7(6). Foretibia markedly curved, inner apical margin produced; length 3.6 mm; AR, IL, MI .............. ................................................................................................................ C. schwarzi Sleeper

– Foretibia straight, inner apical margin rounded ........................................................................ 8

8(7). Pronotal carina prominent at base and in apical third; elytral striae deeply impressed; length 2.9 mm; TX .............................................................................................................. C. bolli Burke

– Pronotal carina or spine restricted to basal fifth or barely evident; elytral striae shallowly or not impressed; SC ........................................................................................................................... 9

9(8). Pronotal carina prominent basally, short but noticeably extended onto pronotal disc; lateral margins of pronotum narrowly rounded (Fig. 26) ........................................................... C. alexi n. sp.

– Pronotal carina tiny, blunt basal spine not extended onto pronotal disc; lateral margins of pronotum broadly rounded .............................................................................. C. skelleyi n. sp. (in part)

10(6). Pronotum with disc markedly striate, individual punctures nearly effaced ............................ 11

– Pronotum with punctures apparent, some elongate and in part confluent, striolae present or not ................................................................................................................................................ 13

11(10). Smaller, length 3.0- 3.6 mm; elytral strial punctures very small; proepipleuron punctate; midwestern U.S. (AR, OK) ......................................................................... C. clispus Sleeper

– Larger, length 3.6-5.0 mm; elytral strial punctures near basal fourth as wide as intervals; proepipleuron striate; southeastern U.S................................................................................ 12

12(11). Foretibia with outer apical margin triangularly produced, apex straight ( Fig. 22 ), without ventral process ....................................................................................................... C. femoratus n. sp.

– Foretibia with outer apical margin and apex rounded, with ventral process apparent in lateral view ( Fig. 23 ) ................................................................................................. C. tibialis n. sp.

13(10). Pronotum substriate, punctures and striae both apparent ...................................................... 14

– Pronotum punctate, completely without striae ......................................................................... 15

14(13). Base of pronotum with small median spine; length 3.5-4.3 mm; SC ............................................. ........................................................................................................ C. skelleyi n. sp. (in part) – Base of pronotum uniformly rounded, without spine; length 2.7-3.0 mm; north FL, south GA ... ............................................................................................................. C. komarecki O’Brien

15(13). Pronotum markedly constricted apically, subquadrate with subparallel sides; elytra scale pattern formed with black and white rectangular maculae surrounding median discal area; length 2.3- 2.7 mm ...................................................................................................... C. isquitus Sleeper

– Pronotum at most somewhat constricted apically, sides distinctly rounded; elytral pattern various but not with quadrate maculae; length 2.0- 3.5 mm .............................................................. 16

16(15). Pronotum and elytra with moderately dense, fine, erect setae; midwestern U.S.................... 17

– Pronotum and elytra with dense, coarse, erect, bristle like setae; southeastern U.S. (SC) .......... ........................................................................................................................ C. paulus n. sp.

17(16). Pronotum slightly wider than long, very finely, closely, deeply punctate, intervals between punctures raised, giving granular appearance; length 2.0-3.0 mm; AR, IA, IL, IN, MO, OH ................... ................................................................................................................. C. chisaius Sleeper

– Pronotum slightly longer than wide, very coarsely, closely punctate surface not granular in appearance; length 3.0- 3.5 mm; IN, OH, WI .......................................... C. confusor Sleeper

Figures

Figure 16-23. Legs of Cercopeus species. 16) Left midfemur, C. femoratus, male, ventral view. 17) Left foretibia, C. alexi, male, lateral view. 18) Left foretibia, C. tibialis, male, lateral view. 19) Right foretibia, C. cornelli, male, ventral view. 20) Right foretibia, C. chrysorrhoeus, female, dorsal view. 21) Left foretibia, C. maspavancus, female, dorsal view. 22) Right foretibia, C. femoratus, female, dorsal view. 23) Left foretibia, C. tibialis, female, lateral view.