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By Paul M. Marsh
The one genus and two species which comprise this family in North America were placed in
the family Braconidae under the subfamily Paxylommatinae in the original catalog. Authors who
have published on this group are nearly evenly divided as to whether it should be given family
or subfamily status, but I have chosen to treat it as a distinct famUy.
These wasps are relatively rare and their host relationships have not been satisfactorily
established. They are found associated with ants and may be ant parasites; however, one record
suggests parasitism of aphids.
Revision: Watanabe, 1946. Matsumushi 1: 24-31 (for World).
Taxonomy: Foerster, 1862. Naturh. Ver. Rheinlande, Verh. 19: 247 (key to genera).
—Marshall, 1891. In Andre, Spec. Hym. Eur. Alg., v. 5, pp. 619-628 (taxonomy, key to
genera). — Ashmead, 1894. Ent. Soc. Wash., Proc. 3: 55-60 (taxonomy, key to genera).
—Marshall, 1899. Ent. Soc. London, Trans. 1899: 73-79 (taxonomy, key to genera).
—Strand, 1914. Ent. Mitt. 3: 27-31 (taxonomy). — Donisthorpe and Wilkinson, 1930. Roy.
Ent. Soc. London, Trans. 78: 87-93 (taxonomy). — Schmiedeknecht, 1930. Hym.
Mitteleuropas, pp. 374-375 (key to genera). — Ceballos, 1943. Eos 19: 63-67 (taxonomy).
— Shenefelt, 1969. Hym. Cat., part 4, pp. 1-4 (cat. World spp.). —van Achterberg, 1976.
Ent. Berich. 36: 61-64 (subfamily status).
Biology: Webster, 1914. Jour. Econ. Ent. 7: 403-404 (No. Amer. host records). —Donisthorpe
and Wilkinson, 1930. Roy. Ent. Soc. London, Trans. 78: 87-93 (review of biology).
Genus HYBRIZON Fallen
Hybrizon Fallen, 1813. Spec. Nov. Hym. Disp. Meth., p. 19. No species.
Type-species: Hybrizon latebricola Nees. By subsequent monotypy.
Paxylomma Brebisson, 1825. In Lepeletier and Serville, Encycl. Meth., Ins. v. 10, p. 23.
Type-species: Paxylomma buccatum Brebisson. Monotypic.
Plancus Curtis, 1833. Ent. Mag. 1: 188.
Type-species: Plancus apicalis Curtis. Monotypic.
Euryptema Foerster, 1862. Naturh. Ver. Rheinlande, Verh. 19: 247.
Type-species: Paxylomma cremieri Romand. Orig. desig.
Eupachylomma Ashmead, 1894. Ent. Soc. Wash., Proc. 3: 58.
Type-species: Wesmaelia rileyi Ashmead. Orig. desig.
Ogkosoma Haupt, 1913. Ent. Gesell. Halle, Mitt. 5-7: 52.
Type-species: Ogkosoma schwarzi Haupt. Monotypic.
The names Paxyloma, Paxylomme, Paxyllomma, Paxylloma, and Pachylomma, used by
various authors, are all to be considered emendations of Paxylomma.
Hybrizon flavocinctus (Ashmead)
n. comb. Va.
Eupachylomma Jlavocincta Ashmead, 1894. Ent. Soc. Wash., Proc. 3: 59. ♂.
Hybrizon rileyi (Ashmead)
n. comb. D. C, Va., Mich., Ind., Iowa. Host: Schizaphis graminum (Rond.).
Wesmaelia nleyi Ashmead, 1889 (1888). U. S. Natl. Mus., Proc. 11: 641. ♂.
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