Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the northeastern Nearctic region
Matthias Buck, Stephen A. Marshall, and David K.B. Cheung
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
Taxonomy. This undescribed species has previously been confused with its western sibling species E. auranus. Bohart (1939a) included in his concept of “E. boscii boscii” (misidentification) both Euodynerus sp. G as well as northeastern, southeastern and Mexican fringe populations of E. auranus (specimens from MI, TX and Coahuila, Mexico). After recognising the true identity of E. boscii (a valid species, see above) Bohart (in Bohart and Menke 1974) described the nameless entity as E. auranus aquilus Bohart. His concept of the subspecies remained more or less unchanged, i.e., he continued to include both eastern/southern E. auranus and Euodynerus sp. G under the new name. However, the holotype (examined, UCDC) and all 17 paratypes (8 examined, UCDC) pertain to southeastern populations of E. auranus, still leaving the eastern sibling species of E. auranus, Euodynerus sp. G, without a name.
Species recognition. See under E. auranus.
Variation. Fore wing length 7.5–8.5 mm (♂♂), 8.5–11.0 mm (♀♀). Punctation of tergum 1 somewhat variable, quite sparse. Apical reflex and punctation of apical fascia of tergum 2 also variable, on average stronger in male than in female. Female clypeus either with a pair of more or less separated basal yellow spots or a large basal crescent-shaped mark; apex narrowly reddish to yellowish, sometimes with small yellow spot(s). Interantennal spot of female entire, in male extending to clypeus but either narrowed or interrupted below prominence. Mandible largely reddish in female, with yellow basal spot. Spot on upper mesopleuron sometimes absent in male. Scutellum with a pair of yellow spots (sometimes suffused with ferruginous), occasionally absent in male. Metanotum black in specimens examined by us. Yellow propodeal spots usually large, sometimes smaller in male. Metasomal terga 1–3 with yellow apical fasciae in female; in male terga 1(–3)–4 fasciate. Tergum 1 usually with very restricted ferruginous markings, sometimes better developed on lateral forward extension of apical fascia. Sternum 2 with yellow apicolateral spots in female, other sterna black; in male fasciae usually complete on sternum 2 and sometimes 3.
Distribution. Not recorded from Canada. We have examined material from the following states in the U.S.: MA, NY (Long Island), NJ, VA, WV, GA, FL and TX (Lee Co.). Bohart’s (1939a) records (as E. “boscii boscii”, misidentification) pertain in part to E. auranus (records from MI, Austin, TX and Mexico), in part to this new species (NJ and MA).
Biology. Unrecorded. Based on the presence of rake setae on the female fore basitarsus and the close relationship with E. auranus (see above) there is little doubt that this species is ground-nesting. Very likely the nest is built in sandy soils as is the case in E. auranus (see also General Part – Morphology).