Definition and Revision of the Spumarius Species-Group of North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) Author Barney, Robert J. text The Coleopterists Bulletin 2017 2017-09-18 71 3 449 460 http://dx.doi.org/10.1649/0010-065x-71.3.449 journal article 10.1649/0010-065X-71.3.449 1938-4394 5376705 urn:lsid:zoobank.org:pub:AAE9A294-5A08-40B1-9020-6EADF0D9DD67 Pachybrachis spumarius Species-Group Group Diagnosis. Small beetles, measuring 1.75–2.63 mm in length. Dorsum yellow, glabrous, with brown, reddish brown, or rust-colored punctures; standard maculae diffuse, often dark brown or fuscous. Eyes of male moderately separated (IOD = 0.17–0.30 mm ); front without ocular lines. Protarsal claws of males not or slightly enlarged. Median lobe in en-face view widest at base, narrowing to a gently rounded ALM with a prominent nodule, varying to a circular orificial space formed by a midpoint constriction; lateral basal plates moderately sclerotized; in lateral view, ventral surface well-inflated at base, forming tube-like median lobe that narrows sharply to terminus; ventral keel absent; setal beard short and fine at apicolateral angle; pencilli absent. Biology. Almost nothing is known of the biology of the members of the spumarius species-group . Series of P. spumarius have been repeatedly collected on Rhus spp. ( Anacardiaceae ). Larvae and larval habitats are unknown.