1 194 Hymenoptera in America North of Mexico 



Atrito7)iits Foerster, 1878. Naturh. Ver. Rheinlande, Verh. 35: 56. Preocc. by Reitter, 1877. 



Type-species: AtritomuH coccopliagus Foerster. Orig. desig. 

 Proclendrocems Kieffer, 1907. In Andre, Spec. Hym. Eur. Alg., v. 10, p. 11. No species. 

 — Kieffer, 1909. in Wytsman, Gen. Ins., fasc. 94, p. 6. One species. 



Type-species: DendroceruH ratzeburgi Ashmead. First included species. 

 AtritovielluN Kieffer, 1914. Das Tierreich, Lief. 42, pp. xv, 139, 141. N. name for Atritomus 



Foerster. 

 Neolygocenix Ishii, 1951. Oyo-Dobuts.-Zasshi 16: 93. 



Type-species: Neolygocerua koyaniae Ishii. Monotypic. 



Species of this genus are most commonly associated with sternorrhynchous Homoptera, espe- 

 cially aphids and mealybugs, and to a lesser extent chermids and psyllids. They usually develop 

 either as hyperparasites through other Hymenoptera that are primary parasites, or as parasites 

 of predatory larvae such as those of Syrphidae (various genera) and Chamaemyiidae (especially 

 Leiicopis and Cre))iaHifa)ii(i). Other recorded hosts include species of Coniopterygidae, 

 Hemerobiidae and the phytophagous dipterous genera Mayetiola and Meroinyza. 



Taxonomy: Brues, 1910 (1909). Wis. Nat. Hist. Soc, Bui. 7: 120-121. — Jansson, 1944. Ent. 

 Tidskr. 65: 190-194. -Ghesquiere, 1960. Soc. Roy. d'Ent. de Belg., Bui. et Ann. 96: 208-215. 

 -Dessart, 1965. Soc. Roy. d'Ent. de Belg., Bui. et Ann. 101: 178-185. — Dessart, 1965. 

 Redia 49: 157-163. -Dessart, 1966. Inst. Roy. Sci. Nat. de Belg., Bui. 42(32): 1-16. -Hellen, 

 1966. Fauna Fennica 20: 4, 9-15. 



Biology: Haviland, 1920. Quart. Jour. Micros. Sci. 65: 101-127. —Clausen, 1940. 



Entomophagous Insects, pp. 257-261. — Muesebeck, 1959. Ent. News 70: 91. —Ghesquiere, 



1960. Soc. Roy. d'Ent. de Belg., Bui. et Ann. 96: 205-208. 

 alaskensis (Ashmead). Alaska (St. Paul Isl.). 



LygoceruH alankensi.s Ashmead, 1902. Wash. Acad. Sci., Proc. 4: 140. 9. 

 americanus (Ashmead). Md. (Odenton). 



AtritowHs americanus Ashmead, 1893. U. S. Natl. Mus., Bui. 45: 122. 6. 

 anomaliventris (Ashmead). Mich. (Marquette). 



Megaspilus anonialii'entrin Ashmead, 1893. U. S. Natl. Mus., Bui. 45: 113, 114. 9. 

 attentus (Muesebeck). Maine, N. Y., N. J., Ohio. Host: Aphidiidae in Macrosiphum euphorbiae 

 (Thomas). 



LygoceruN atteiitns Muesebeck, 1959. Ent. News 57: 94. 9, 6. 

 californicus (Ashmead). Calif. 



Lygocenis californicus Ashmead, 1893. U. S. Natl. Mus., Bui. 45: 109, 111. <J. 

 constrictus (Brues). Wash. 



Lygocenis constrictus Brues, 1910 (1909). Wis. Nat. Hist. Soc, Bui. 7: 119. 6. 

 conwentziae Gahan. Mass. Host: Conwentzia hageni Banks. 



Dendrocerus conwentziae Gahan, 1919. Ent. Soc. Wash., Proc. 21: 122. 9, S. 

 conwentziae var. rufus Gahan. Wash., Calif. Host: Conwentzia sp. 



Deudrocerus co)iwentziae var. rufus Gahan, 1919. Ent. Soc. Wash., Proc. 21: 123. 9, <J. 



floridanus (Ashmead). Fla. (Jacksonville). Host: Cinara sp. (probably secondary). 



Cliirocerns floridanus Ashmead, 1881. Amer. Ent. Soc, Trans. 9: Proc, p. xxxiv. 9,6. 



incompletus (Muesebeck). Maine. Host: Aphidiidae in Macrosiphum euphorbiae (Thomas). 



Lygocerus incompletus Muesebeck, 1959. Ent. News 57: 96. 9, 6. 

 latifrons (Muesebeck). Calif. Host: Species of Hemerobiidae. 



Lygocerus latifrons Muesebeck, 1959. Ent. News 57: 93. 9, 6. 

 leucopidis (Muesebeck). CaHf. Host: Leucopis sp. 



Lygocerus leucopidis Muesebeck, 1959. Ent. News 57: 91. 9, 6. 

 niger (Howard). Transition and Upper Austral Zones. Host: Aphidiidae parasitic in various 

 aphids. 



Megaspilus niger Howard, 1890. U. S. Dept. Agr., Insect Life 2: 247. 9. 

 obscurellus Muesebeck, n. name. Calif. (San Mateo). 



Atritomus califoruicus Kieffer, 1906 (1905). Berlin. Ent. Ztschr. 50: 256. 6. Preocc. by 

 Ashmead, 1893. 



