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

Diagnostic Features
  • Description: Elongate-oblong, moderate-sized, ranging from about 12–14 mm in length. Integument generally dark brown with whitish, ferrugineous, and ochraceous pubescence. Head with frons elongate, about as wide as width of 2 1/2 lower eye lobes. Eyes with lower lobes ovate-oblong. Genae elongate, distinctly shorter than lower eye lobes. Antennal tubercles prominent, moderately separated; tubercles armed at apex with a small projection, or with a short, blunt horn; antennae about as long as overall body length, or as much as 1 1/2 times as long; scape clavate, shorter than antennomere IV; antennomere III curved or sinuate, longer than scape and antennomere IV. Pronotum transverse, roughly conical, wider at base, with or without lateral tubercles. Elytra with sides attenuate; elytral apices individually rounded; elytra 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. Mesocoxae with distinct tubercle. Mesosternal process with apex subtruncate to feebly emarginate. Metafemora moderate to short in length, about 1/3–1/4 as long as elytra.

  • The combination of the following characters will help to distinguish this genus: moderately large eyes; sinuate antennomere III; roughly conical pronotum; and elytra with sides attenuate.

  • Similar genus/genera: superficially resembles Apocoptoma, Lachnia and Trestonia.
Geographic Distribution
  • South America (Bolivia, Brazil, Ecuador, Trinidad & Tobago, Peru)
Host Plants/Trees
  • Unknown
Girdling Behavior
  • Unknown
Notes

The genus Leus currently contains one species:
  Leus ramuli (Bates, 1865) [♀ specimen]
  Leus ramuli (Bates, 1865) [syntype specimen, ♂]

Generic Synonymies
  • The type species of this genus was originally described in the genus Trestonia.
Selected References
 

Leus ramuli
♀ 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.