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

Diagnostic Features
  • Description: Elongate-oblong, small to moderate-sized, ranging from about 10–15 mm in length. Integument generally dark brown or black with whitish, ferrugineous, black, and ochraceous pubescence. Head with frons elongate, about as wide as width of 1 1/2 lower eye lobes. Eyes with lower lobes large, oblong. Genae subquadrate to elongate, distinctly shorter than lower eye lobes. Antennal tubercles prominent, narrowly separated, contiguous at base; tubercles armed with short, blunt horn; antennae distinctly longer than overall body length, as much as twice as long; scape gradually expanded to apex, about as long or shorter than antennomere IV; antennomere III nearly straight or curved, longer than scape and antennomere IV; antennomere XI shorter than X (females) or longer than X (males). Pronotum transverse, roughly conical, wider at base, with or without lateral tubercles. Elytra with sides roughly parallel; elytral apices individually rounded; elytra generally uniform in coloration or speckled; base of elytra with two prominent tubercles at humeri. Basal 1/3 of elytra with sparse to dense punctation, surface finely punctate, coarsely punctate, or granulate-punctate. Procoxae without projection or with an obtuse tubercle. Mesosternal process with apex subtruncate to deeply 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: large eyes; narrowly separated antennal tubercles, contiguous at base; scape gradually expanded to apex; roughly conical pronotum; and elytra with sides roughly parallel.

  • Similar genus/genera: superficially resembles Cordites, Cylicasta, and Pericasta.
Geographic Distribution
  • South America (Argentina, Bolivia, Brazil, Ecuador, French Guiana, Paraguay, Peru, Uruguay)
Host Plants/Trees
  • Caesalpiniaceae (Parkinsonia aculeata)
Girdling Behavior
  • Unknown
Notes

The genus Peritrox currently contains five species:
  Peritrox denticollis Bates, 1865 [type specimen]
  Peritrox marcelae Nearns & Tavakilian, 2012 [type specimen, ♂]
  Peritrox nigromaculata Aurivillius, 1920 [type specimen, ♂]
  Peritrox perbra Dillon & Dillon, 1945 [♂ specimen]
  Peritrox perbra Dillon & Dillon, 1945 [allotype specimen, ♀]
  Peritrox vermiculatus Dillon & Dillon, 1945

Generic Synonymies
  • None
Selected References
 

Peritrox perbra
♂ 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.