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During their larval stages the two North American rhopalosomatids are external parasites of
nymphal crickets. Gumey (1953) undoubtedly had material of both species before him in his
study of the biology and larval stages of what he supposed to be Rhopalosoma only. He
recorded as hosts Hapithis a. agitator Uhler, H. agitator quadrattis Scudd., H. brevipennis
Sauss., H. sp., and Orocharis sp.
Taxonomy: Gumey, 1953. U. S. Natl. Mus., Proc 103: 25-31, figs. 8, 9 (larva).
Biology: Gumey, 1953. U. S. Natl. Mus., Proc. 103: 19-25, pi. 1.
Genus RHOPALOSOMA Cresson
The adults are fully winged, have enlarged ocelli and are noctumaL
Superfamily POMPILOIDEA 1571
Rhopalosoma Cresson, 1865. Ent. Soc. Phila., Proc. 4: 58.
Type-species: Rfiopalosoma Poeyi Cresson. Monotypic.
SihyUina Westwood, 1868. Ent. Soc. London, Trans, p. 329.
Type-species: Sibyllhia aenigrtiatica Westwood. Monotypic (,=Rhopalosoma poeyi
Cr.).
Revision: Brues, 1943. Ent. Soc. Amer., Ann. 36: 310-318, 1 pi.
Rhopalosoma nearcticum Brues
Md. south to Fla., Ky., Mo. Host: Orocharis saltator Uhler.
Rhopalosoma nearcticum Brues, 1943. Ent. Soc. Amer., Ann. 36: 316. ♀, ♂.
Biology: Hood, 1914 (1913). Ent. Soc. Wash., Proc. 15: 145-147, 1 fig. (Misdet. as R. poeyi
Cresson.)
Genus OLIXON Cameron
Olixon Cameron, 1887. Biol. Cent.-Amer. Hym., v. 1, p. 412.
Type-species: Olixon testaceum Cameron. Monotypic.
Saphobethylus Kieffer, 1911. Soc. Sci. BruxeUes, Ann. (2) 35: 216.
Type-species: Saphobethylus pallidus Kieffer. Monotypic.
Nealgoa Brues, 1922. Psyche 29: 105.
Type-species: Nealgoa banksii Brues. Monotypic.
This genus is unusual in that extreme brachyptery is equally developed in both sexes. The
species are much smaller than Rhopalosoma, have tiny ocelli and are diurnal.
Taxonomy: Reid, 1939. Roy. Ent. Soc. London, Proc. 8: 101.
Olixon banksii (Brues)
N. Y., D. C, N. C, Ga., Fla., Ohio, Minn., Kans. Host: Nemobius sp.; Hapithis
agitator Uhler.
Nealgoa banksii Brues, 1922. Psyche 29: 106. ♀.
Biology: Krombein, 1950 (1949). Elisha Mitchell Sci. Soc, Jour. 65: 264-265 (male).
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