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Classification |
........Stenocrates Burmeister,
1847 |
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........Stenocrates Burmeister
1847: 83. |
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Stenocrates bicarinatus.
Illustration by Dan Schmidt.
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Cyclocephalini
key |
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Distribution: the
species are widely distributed from Mexico to Argentina with most occurring
in South America.
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Composition: currently
45 species (Endrödi 1966, 1985a; Ratcliffe 1978; Dechambre 1979b,
1985; Delgado 1991; Dupuis and Dechambre 1995; Dechambre and Hardy
2004), and more species
are waiting to be described.
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Diagnosis:
unlike most species in the tribe Cyclocephalini, the males do not have
enlarged protarsal claws. Species in the genus are also characterized
by a relatively short, trapezoidal clypeus that has its apex broadly
truncate (slightly emarginate or not); a distinct frontoclypeal suture;
three pairs of punctate striae on the elytra; and the four posterior
legs strongly flattened. The antenna is 10-segmented with a small
club.
Most of
the species are externally similar to one another and difficult to tell
apart, and so great reliance is made on the form of the male parameres
for identification. Even
so, this is a difficult genus with which to work. Often, females
not associated with males cannot be identified. Because of the
high number of cryptic species in Stenocrates, a number of new
species still await discovery and description.
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Larvae: the immature stages remain unknown for all the species.
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Biological notes:
life history information is also lacking. The adults are attracted
to lights.
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Revision or synopsis:
Endrödi (1966, 1985a) provided the last synopsis of the genus,
but nearly 20 new species have been described since that time. These
remain unincorporated in any key, and so a new synopsis is badly needed.
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Literature cited:
Endrödi, S. 1966. Monographie der Dynastinae (Coleoptera, Lamellicornia).
I. Teil. Entomologische Abhandlungen 33: 1-460.
Endrödi, S. 1985a. The Dynastinae of the World. Dr. W.
Junk Publisher, Dordrecht. 800 pp., 46 plates.
Ratcliffe, B. C. 1978. New species of Stenocrates from Brazil
(Coleoptera: Scarabaeidae). Acta Amazonica 8: 489-495.
Dechambre, R.-P. 1979b. Cinq espèces nouvelles de Stenocrates (Col.
Scarabaeoidea Dynastidae). Revue Française d'Entomologie (N.S.)
1: 61-64.
Dechambre, R.-P. 1985. Quatre nouvelles espèces de Stenocrates (Coleoptera,
Dynastidae). Revue Française d'Entomologie (N.S.) 7: 142-144.
Delgado, L. 1991. Una especie nueva mexicana de Stenocrates (Coleoptera:
Melolonthindae; Dynastinae). Anales del Instituto de Biología,
Universidad Nacional Autónoma de México (serie Zoología)
62: 103-108.
Dupuis, F. and R.-P. Dechambre. 1995. Mise au point sur les Stenocrates du
groupe cultor (Coleoptera, Dynastidae). Revue Française
d’Entomologie (N.S.) 17: 59-61.
Dechambre, R.-P. and M. Hardy. 2004. Quatre nouvelles espèces
de Stenocrates Burmeister, 1847 (Coleoptera, Dynastidae).
Coléoptères 10: 209-214.
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Author: Brett
Ratcliffe
Generated on: 06/FEB/2007.....Last
modified: 06/FEB/2007
University of Nebraska State Museum - Division of Entomology
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