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Males:
Apex of last abdominal sternite emarginate. Protarsomeres 4-5 and/or
anterior claw enlarged in all genera except Stenocrates Burmeister,
one
species of Dyscinetus Harold, and Erioscelis Burmeister.
Females: Apex of last abdominal sternite entire, evenly
parabolic. Protarsomeres
4-5 and anterior claw always simple, not enlarged. |
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1.
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Protibia
in males slender, strongly curved, with tooth near base; females with
protibia normal. Length 35-40 mm |
Harposceles
Burmeister
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1'.
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Protibia
not proportionally slender, not curved, lacking tooth near base. Size
variable |
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2(1).
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Body
broad, oval. Color black or reddish brown. Length 14-16 mm |
Arriguttia
Martínez |
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2'.
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Body
not distinctly broad, oval. Color variable. Length 5-30 mm |
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3(2).
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Elytra
strongly, completely, irregularly punctate; surface yellowish with
dark spots, usually with metallic reflection. Apex of clypeus round,
margin beneath enlarged |
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Augoderia Burmeister
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3'.
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Elytra
punctate, punctate-striate, or not, but never completely and irregularly
punctate; surface yellow or not but never with metallic reflection.
Apex of clypeus variable in shape, margin beneath apex only rarely
thickened |
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4(3).
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Body
strongly flattened. Size 35-40 mm. Color black. Males with protarsi
strongly thickened |
Surutu
Martínez |
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4'.
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Body
not strongly flattened. Size less than 30 mm. Color variable. Males
with protarsi enlarged or not |
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5(4).
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Clypeus
with apex distinctly pointed or narrowly parabolic (Figs. 3-5) |
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5'.
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Clypeus
with apex rounded (Fig. 6), truncate (Fig. 7), or emarginate (Fig.
8) but not distinctly pointed or narrowly parabolic |
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6(5).
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Clypeus
with apex sharply acuminate (Fig. 3). Mentum with apex distinctly
(but never deeply) emarginate, surface at center not furrowed in apical
third (Fig. 9). Base of pronotum with marginal bead. Length less than
16 mm |
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6'.
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Clypeus
with apex narrowly parabolic (Figs. 4-5). Mentum with apex distinctly
(often deeply) emarginate, surface at center furrowed in apical third
(Fig. 10). Base of pronotum without marginal bead. Length usually
more than 18 mm, rarely as small as 15 mm |
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7(6).
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Prepygidium
with long setae
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Chalepides
Casey |
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7'. |
Prepygidium
lacking long setae |
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8(7).
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Clypeus
with apex transversely subtrapezoidal to trapezoidal in shape (Figs.
11-12) |
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8'.
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Clypeus
with apex rounded, truncate, subquadrate or emarginate (Figs. 6-8)
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9(8).
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Clypeus
trapezoidal, sides strongly convergent to truncate or feebly emarginate
apex, anterior corners angulate (Fig. 12). Frontoclypeal suture distinct,
usually broadly depressed just before suture. Pronotum with anterior
margin normally arcuate, not produced forward at middle (Fig. 12).
Meso- and metafemora and tibiae strongly flattened. Males with protarsomeres
simple, not enlarged |
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9'.
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Clypeus
subtrapezoidal to trapezoidal, sides only gradually convergent to
truncate or weakly emarginate apex, anterior corners rounded (Fig.
11). Frontoclypeal suture a finely impressed line but not with deep
and broad impression before it. Pronotum on anterior margin produced
anteriorly at middle (Fig. 11). Meso- and metafemora and tibiae not
strongly flattened. Males with anterior claw and usually protarsomeres
4-5 enlarged |
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10(8).
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Clypeus
with sides usually divergent (sometimes only slightly) at base, apex
broadly rounded (Fig. 13). Maxilla lacking teeth (except for the distinctive
Aspidolea fuliginea Burmeister), apex penicillate (setae usually long
and dense) |
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10'.
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Clypeus
with sides parallel or convergent from base (never divergent), apex
rounded, subtruncate, or emarginate. Maxilla armed with distinct teeth,
only rarely penicillate in addition (a few species of Cyclocephala)
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11(10).
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Clypeus
subquadrate, sides weakly converging to broad apex, apex truncate
or emarginate (Figs. 14-15). Males with protarsus simple, not enlarged
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11'.
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Clypeus
not subquadrate, instead with sides converging from base to rounded,
parabolic, or emarginate apex (Figs. 6-8). Males with protarsus enlarged
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