Synonyms and other taxonomic changes
The taxonomy of this genus at the subgenus level and lower is problematic. Many species are rarely collected and it is difficult to assess inter- and intra-specific variability. Species are difficult to define because the geographic limits of some species and subspecies cannot be precisely delimited. For example, based on collection records, all three subspecies of D. brevis may actually represent three sympatric species (D. brevis, D. recalvus, and D. ochreus). More collecting and molecular studies may help elucidate these taxonomic problems. Some authorities have also called into question the validity of the subgenera, as well. Three subgenera (Deuteragenia, Dipogon, and Winnemanella) are traditionally recognized but some of the more recently described taxa are intermediate between the subgenus Dipogon and the subgenus Deuteragenia. One study even has supporting evidence that all of the former subgenera combined form a monophyletic tribe and the subgenera be elevated to generic status (Lelej and Loktionov, 2012).
Explanation of Names
Di-(two) pogon (beard) referring to the curved fascicles of hair-like setae on the maxilla of females.
3-12 mm. Some species in the subgenus Dipogon are among the smallest of pompilids.
Three teeth on the inner side of the mandibles (apical point counted as a tooth).
Both sexes with smooth dorsal edge of hind tibiae.
Female with a fascicle of bristles arising from each side of the maxilla.
Ageniella, Auplopus, and [/i]Phanagenia[/i] are all similar to Dipogon and are found in the same habitat. These three species have the sides of the first tergum concave, when viewed from above. Some species of Dipogon may approach this, but the sides are at most straight. Also, some species of Ageniella have the dorsal edge of the hind tibiae serrate, and females lack strong bristles on the maxilla. All female Auplopus have an oval bare area on the last tergum; this is absent, and often very setose in Dipogon. All similar species in the Pepsini have the dorsal edge of the hind tibiae serrate and none have strong setae on the maxilla. The most similar genus in the Pepsini is probably Priocnemis, but females always have serrate posterior tibiae and both sexes have the posterior half of tCu2 (forewing) curved, but this vein is straight in Dipogon.
Transcontinental. Many recently described species are known from only a handful of specimens, so their range is not well known.
Nearly all are silvicolous or at least found near woods. Females are found searching stems, twigs, branches, or tree trunks for nest cavities. They hunt on the ground or on low vegetation.
Many species are typically found during most of the warm season from May through September.
This genus very infrequently visits flowers, D. sayi sayi has been observed on Daucus carota. Females of this genus will provision nests with almost any common family of spider, though prey choice is more restricted depending on the species.
Many of the common species are multivoltine. This information is poorly known for some species. This genus (in species that have been observed) nests in borings or other crevices in wood. Females can often be taken or observed on the trunks or branches of dead trees, presumably searching for nest sites.
This genus has rather cryptic habits and some are poorly studied. Several species were discovered after the revision by Townes in 1957 but are listed in Krombein et al. (1979) (see below). The only one not listed in this literature was described in 1987 by Howard Evans, D. lignicolus.
bears a superficial resemblance to this genus. See also
Townes, H.K. 1957. Nearctic wasps of the subfamilies pepsinae and ceropalinae. U.S. Nat. Mus. Bull. 209: 1-286.(species descriptions, keys work for most eastern species, distribution).
Krombein, K.V. 1979. Pompilidae, pp. 1533-1536. In Krombein, K.V., P.D. Hurd, Jr., D.R. Smith, and B.D. Burks, eds. Catalog of Hymenoptera in America North of Mexico. Vol. 2 Apocrita (Aculeata). Smithsonian Inst. Press, Washington, D.C. (more complete list of species, prey records, distribution)
Lelej, A.S. and V.M. Loktionov. 2012. Phylogeny and Classification of the tribe Deuterageniini (Hymenoptera, Pompilidae:Pepsinae). Far Eastern Entomologist, 254:1-15.
Original descriptions of D. anasazi, D. kiowa, and D. konza:
Original description of D. parkeri:
Original description of D. leechi and D. diablo:
Original description of D. lignicolus:
Original description of D. fulleri: