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Hincks, 1945 comparative info return to: prev home
Eyes minutely setose. Mandibles barely meeting medially. Clypeal margin truncate to
very weakly bilobed. Flagellar formula 1,4,2 or 1,3,3 in both sexes; flagellum strongly
compressed and broadening apically in females; basal 3 funicular segments with branches in
males. Notauli incomplete; half of dorsal axillar surface advanced beyond scutellar
margin. Postmarginal vein at most 1.7x stigmal vein length; forewing
disc almost always with large, uniform fuscate area posterior to
marginal and postmarginal veins [lost in some specimens]; uncus usually separated
by more than its own length from stigmal apex [some specimens have a reduced
stigma]. Propodeum with complete, though weak, median carina, without plicae. Scape,
mesocoxa, and metacoxa usually light tan to white [sometimes light brown, especially in
males]. Compare with: Sympiesis, Necremnus,
1a-c: Dahlbominus male antenna (left), female antenna (center), and
forewing venation (right)
2a: Dahlbominus female, lateral view
3a: Dahlbominus forewing
4a: Dahlbominus dorsal view of mesosoma
ectoparasitoids of Diprionids.
fuscipennis (Zetterstedt), the single described species of Dahlbominus, is
an interesting species phylogenetically, as it may give clues to the relationships of Necremnus
and Sympiesis. It is actually easily recognized using a reference collection, but
potentially confusing to workers who have not seen it before, due to the lack of accurate
taxonomic literature regarding it. I have seen some southern African specimens that may
represent undescribed species of this genus.
Sympiesis: Postmarginal vein 2x stigmal vein
length or longer. Propodeum often without median carina, sometimes with plicae. Some
species are similarly colored to D. fuscipennis (white coxae), but the
postmarginal vein and propodeum distinguish them easily. Certain other species, especially
some known from Florida, are very difficult to distinguish from D. fuscipennis
because of their short postmarginal vein and similar body form. They differ mainly by the
short stigma, coloration, and lack of fuscate cloud on the forewing.
Necremnus: Females always with 3 funicular
segments. Scape, mesocoxae, and metacoxae not whitish, forewing rarely with a
similar fuscate cloud, uncus in some species separated from stigmal apex by less than its
own length (unfortunately the best characters, other than association with females, for
distinguishing males). Necremnus californicus (Girault) is very similar to D.
fuscipennis in body shape and forewing features, but differs in the other characters
Females always with 3 funicular segments. Males with only 2 flagellar branches. Most
species with parallel scutellar grooves. Coloration never similar. Body more elongate as a
rule. Forewing without large fuscate cloud.
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Askew, R.R. 1968. Hymenoptera 2. Chalcidoidea section (b). Handbooks
for the Identification of British Insects. 8(2)b.
Boucek, Z. 1959. A study of central European Eulophidae, 1:
Eulophinae (Hymenoptera). Acta Entomologica Musei Nationalis Pragae. 33:
Erdös, J. 1951. Eulophidae novae. Acta Biologica Academiae
Scientiarum Hungaricae. 2: 169-237.
Schauff, M.E., J. LaSalle, & L.D. Coote. 1997. Chapter 10.
Eulophidae. in "Annotated Keys to the Genera of Nearctic Chalcidoidea
(Hymenoptera)". G.A.P. Gibson & J.T. Huber, eds. NRC Research Press, Ottawa.
Image credits: 1a: Erdös (1951). 1b: Schauff, et al. (1997).