348 Hymenoptera in America North of Mexico 



Genus PERITHOUS Holmgren 



The species of Perithous are parasites or hyperparasites of Sphecidae which nest in canes or 

 twigs. 



Genus PERITHOUS subgenus PERITHOUS Holmgren 



Perithous Holmgren, 1859. Svenska Vetensk.-Akad., Ofvers af ... Forhandl. 16: 123. 

 Type-species: Ephialtes albicinctus Gravenhorst. Desig. by Viereck, 1914. 

 divinator (Rossi). Que. s. to Conn, and Pa., w. to Wis.; Europe. Adventive. Host: Pemphredon 

 lethifer (Shuck.), P. iugubris (F.), Passaloems gracilis (Curt), Psenulus pallipes (Pzr.), 

 Trypoxylon figulum (L.), Omalus auratus (L.). Except for Pemphredon lethifer, which 

 is recorded as a host in both North America and Europe, these hosts are recorded only 

 in Europe. P. (P.) divinator appears to have entered the northeastern U. S. A. before 

 1931. 



Ichneumon divinator Rossi, 1790. Fauna Etrusca, v. 2, p. 48. 9. 



Pimpla ephippiatoria Dufour and Perris, 1840. Soc. Ent. France, Ann. 9: 47. S , 9. 



Pimpla marginellatoria Dufour and Perris, 1840. Soc. Ent. France, Ann. 9: 48. 6, 9. 

 Synonymy uncertain. 



Itoplectis rubi Habermehl, 1917. Ztschr. f. Wiss. Insektenbiol. 13: 117. i, 9. 



Perithous pimplarius Haupt, 1938. Maerk. Tierwelt 3: 209. 9. 



Biology: Horstmann, 1964. Fauna Mitt. Norddeutschl. 2: 193-197. —Thomas, 1964. Mich. 

 Acad. Sci., Arts, and Letters; Papers 49: 199-201. —Horstmann, 1967. Zool. Anz. 178: 

 95-102. 

 mediator neomexicanus (Viereck). Western Alta. s. to N. Mex., w. to B. C. and Calif. Host: 

 Pemphredon confertim (Fox). P. (P.) mediator mediator (Fabricius) is European. 

 Pimpla neomexicana Viereck, 1903. In Skinner, Amer. Ent. Soc, Trans. 29: 88. 9 . 



Biology: Parker and Bohart, 1966. Pan-Pacific Ent. 42: 94. 

 mediator pleuralis (Cresson). Que. s. to S. C, w. to Sask., Kans., and La. Host: Pemphredon 

 concolor Say, P. inomatus Say, P. harbecki Roh.? 

 Pimpla pleuralis Cresson, 1868. Canad. Ent. 1: 36. 9. 



Biology: Champlain, 1922. Psyche 29: 97. — Rheinhard, 1929. Nature Mag. 13: 155-157. 

 — Krombein, 1960. Ent. News 71: 31. 



Genus PERITHOUS Subgenus HYBOMISCHOS Baltazar 



Peritho^is subg. Hybomischos Baltazar, 1961. Natl. Inst. Sci. Tech., Manila, Monog. 7: 49. 

 Type-species: Perithous (Hybomischos) galbus Baltazar. Grig, desig. 

 septemcinctorius (Thunberg). Mich.; Europe. Adventive. Host: Pemphredon spp., Psen 



(Mimumesa) dahlbomi (Wesm.), Psenulus fuscipennis (Dahl.). These hosts are recorded 



in Europe. One female was recently found in a spider web in Ann Arbor, Mich, by 



Torgerson (1972). 

 Ichneumon septemcinctorius Thunberg, 1822; 1824. Acad. Imp. des Sci. St. Petersburg, 



Mem. 8: 280; 9: 363. 9. 

 Ephialtes varius Gravenhorst, 1829. Ichn. Europaea, v. 3, p. 254. 6,9. 

 Perithous bncrniesceyts Koornneef, 1951. Ent. Ber. 13: 249. 9. Synonymy uncertain. 

 Perithous exigiius Haupt, 1954. Deut. Ent. Ztschr. 1: 108. 9. 

 Perithous septemcinctorius meridionator Aubert, 1963. Vie et Milieu 14: 849. d, 9. Syn.? 



Taxonomy: Torgerson, 1972. Great Lakes Ent. 5: 99. 



Genus DELOMERISTA Foerster 



Delomerista Foerster, 1868. Naturh. Ver. Rheinlande, Verh. 25: 164. 



Type-species: Pimpla mandibulars Gravenhorst. Monotypically included and desig. 

 by Schmiedeknecht, 1888. 



Delomerista spp. have most often been reared from cocoons of sawflies, but they may also 

 parasitize Lepidoptera. 



