Oncid ID: Tool for Diagnosing Adult Twig Girdlers (Cerambycidae: Lamiinae: Onciderini)
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Genus: Hesycha

Diagnostic Features
  • Description: Elongate-oblong, moderate-sized, ranging from about 10–14 mm in length. Integument generally dark brown or ferrugineous with whitish, ferrugineous, black, and ochraceous pubescence. Head with frons subquadrate, about as wide as width of 3–4 lower eye lobes. Eyes with lower lobes oblong to distinctly narrow. Genae elongate, about as tall as lower eye lobes. Antennal tubercles prominent, moderately separated; tubercles not armed at apex (females) or armed with a short, blunt horn (males); antennae about as long as overall body length (females), or as much as 1 1/3 times as long (males); scape clavate, shorter than antennomere IV; antennomere III sinuate, longer than scape and antennomere IV. Pronotum transverse, roughly cylindrical to conical, wider at base, without lateral tubercles. Elytra with sides roughly parallel to attenuate; elytral apices individually rounded; elytra generally uniform in coloration or speckled, or with distinct maculae; base of elytra with two prominent tubercles at humeri. Basal 1/3 of elytra with dense punctation, surface coarsely punctate. Procoxae without projection (females) or with small acute projection or distinct, curved hook (males). Mesosternal process with apex subtruncate to feebly emarginate. Metafemora moderate in length, about 1/3 as long as elytra.

  • The combination of the following characters will help to distinguish this genus: oblong to distinctly narrow eyes; elongate genae; sinuate antennomere III; base of elytra with two prominent tubercles at humeri; and moderately-long metafemora.

  • Similar genus/genera: superficially resembles Bucoides and Glypthaga.
Geographic Distribution
  • South America (Argentina, Bolivia, Brazil, Chile, Paraguay)

  • NOTE: Although Hesycha cribripennis was originally described from Chile (Fairmaire & Germain, 1859), this is likely an erroneous record as no members of this species have been collected there since.
Host Plants/Trees
  • Unknown
Girdling Behavior
  • Unknown. However, Martins (1975) reported that members of this genus oviposit in dead wood and are not believed to be girdlers of branches.
Notes

The genus Hesycha currently contains 12 species:
  Hesycha biguttata Martins & Galileo, 2010 [holotype specimen, ♂]
  Hesycha bimaculata Martins & Galileo, 1990 [♂ specimen]
  Hesycha bimaculata Martins & Galileo, 1990 [holotype specimen, ♂]
  Hesycha clavata Martins & Galileo, 1990 [holotype specimen, ♂]
  Hesycha consimilis Thomson, 1868 [type specimen, ♂]
  Hesycha cribripennis Fairmaire & Germain, 1859 [type specimen]
  Hesycha crucifera Dillon & Dillon, 1952
  Hesycha fasciata Martins & Galileo, 1990 [holotype specimen, ♂]
  Hesycha inermicollis (Breuning, 1940) [=H. ocellifera holotype specimen, ♀]
  Hesycha microphthalma Martins & Galileo, 1990 [holotype specimen, ♀]
  Hesycha simplex Martins & Galileo, 1990 [holotype specimen, ♀]
  Hesycha tavakiliani Nearns & Swift, 2011 [holotype specimen, ♀]
  Hesycha variabilis Dillon & Dillon, 1945 [holotype specimen, ♀]

Generic Synonymies
  • Estolosybra, Falsestola
Selected References
 

Hesycha bimaculata
♂ specimen
© E.H. Nearns

 

© 2011-2015 Nearns, E.H., Lord, N.P., and K.B. Miller
The University of New Mexico and Center for Plant Health Science and Technology, USDA, APHIS, PPQ.