Longicorn ID: Tool for Diagnosing Cerambycoid Families, Subfamilies, and Tribes

Acrocinini

Classification

Introduction

The tribe Acrocinini Swainson & Shuckard, 1840 currently contains 1 species in 1 genus. The only species in this tribe, Acrocinus longimanus, is commonly referred to as the Harlequin Beetle.

Diagnostic Features of Adults

Body large-sized, approximately 40 mm or longer; generally elongate. Eyes generally reniform, complete (not completely divided into upper and lower lobes). Antennae filiform, unarmed; antennae long, generally extending beyond elytral apices by several segments. Head without distinct lateral or anterior projections. Pronotum transverse (distinctly wider than long); lateral margins of pronotum with distinct acute spines. Mesocoxal cavity open to mesepimeron. Wings complete. Legs with tarsal claws smooth; claws broadly divergent (divaricate); profemora distinctly elongated, especially in males. Elytral humeri distinctly modified with acute spines.

Diagnostic Features of Larvae

Larva. Form elongate, strongly depressed; integument firm, covered with short, rather stiff hairs. Head very strongly depressed, sides regularly and strongly converging posteriorly; epistoma straight; labrum a little wider than long, broadly rounded, widest near base; mandible slender, elongate, length about three times condylar width, cutting-edge shallowly emarginate, antennal ring faintly bisected by frontal suture. Ventral mouth-parts elongate; mentum twice as wide as long, distinct; last joint of maxillary palpus shorter than penultimate, much shorter than last labial; anterior edge of hypostoma straight; gula not distinct. Prothorax depressed; pronotum posteriorly beset with chitinous, conical papillae, as also are the ampullae; pleural tubercles broadly oval, having a chitinous pit at each extremity and five or six setae; spiracles broadly oval, peritreme thin. Adapted from Craighead (1923).

Geographic Distribution of Tribe

Biology and Economic Importance

Acrocinus longimanus is commonly collected at lights and on dead or dying trees, especially strangler fig (Ficus spp.). This species is known from a variety of host plant families, including the economically important families Fabaceae and Sterculiaceae.

Selected References to Adult Specimens

Selected References to Larvae Specimens


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