Hylurgus ligniperda (Fabr.) Screening Aid
(Subfamily Hylesinae, Tribe Tomicini)
From: Cavey, J., Passoa, S. and Kucera D. 1994, Screening Aids for Exotic Bark Beetles in the Northeastern United States. NA-TP-11-94. Northeastern Area: U.S. Department of Agriculture, Forest Service.
General Appearance in a Sample. Moderately large, 4.0-5.7 mm, black-brown, cylindrical, covered with rather long reddish hairs (Fig. 1). The distinctive, dense hairs are quite thick, and they appear notched at magnifications under 80X. (Actually, at very high magnification (Fig. 8), one can see these hairs are branched.) The elytral apex is convex with a slight indentation, and without teeth or other armature. Hylurgus ligniperda is superficially similar to Hylastes porculus Erichson, a local, nearly hairless species.
Recognizing the Genus. Most similar to Dendroctonus and Tomicus, the genus Hylurgus is not known to occur in North America (Wood 1982). In the key to help screen for Tomicus piniperda (Passoa and Cavey 1993), Hylurgus will key to Tomicus, primarily because both have a 6-segmented funicle. In Wood (1982), specimens of Hylurgus will not go beyond couplet 11 in the generic key, again because of the 6-segmented funicle. The following key (modified form Wood 1982, 1986) will help differentiate Hylurgus from North American bark beetles, including T. piniperda.
Key to Help Screen Hylurgus ligniperda
F. from Survey Samples
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