Superfamily ICHNEUMONOIDEA 313 



Revision: Smith, 1944. Aphidiinae of North America, pp. 96-98. 



Taxonomy: Mackauer, 1960. Beitr. z. Ent. 10: 138. — Mackauer, 1961. Ztschr. f. Parasitenk. 

 20: 586-587. 

 caudacanthus (Smith). Fla., Wis. Host: Dactynotus erigeronensis (Thomas), D. gravicomis 

 (Patch). 

 Trioxys (Acanthocaudus) caudacanthus Smith, 1944. Aphidiinae of North America, p. 97. 

 9, (J. 

 schlingeri (Muesebeck). B. C. Host: Dactynotus ambrosiae (Thomas). 



Trioxys (Acanthocaudus) schlingeri Muesebeck, 1958. Ent. News 69: 144. 9,6- 

 tissoti (Smith). Eastern Canada, Fla. Host: Dactynotus rudbeckiae (Fitch), D. russellae H. R. 

 L. 

 Trioxys (Acanthocaudus) tissoti Smith, 1944. Aphidiinae of North America, p. 96. 9,6. 



Family HYBRIZONTIDAE 



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. 



flavocinctus (Ashmead), n. comb. Va. 



Eupachylomma Jlavocincta Ashmead, 1894. Ent. Soc. Wash., Proc. 3: 59. S. 



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. 5. 



