Superfamily ICHNEUMONOIDEA 715 



Free.), Olethreutidae (Ajicylis comptana [Froel.]), and Yponomeutidae {Zelleria 



haimbachi Bsk.). 

 Mesochonts flaviceps Provancher, 1879. Nat. Canad. 11: 210. 9. 

 floridanus Dasch. Northern Fla. Ecology: The single paratype can be presumed to have been 



reared from a parasite of the "spotted leaf tyer on oak." 

 Stictopisthus floridanus Dasch, 1971. Amer. Ent. Inst., Mem. 16: 288. 6, 9. 

 lanceolatus Dasch. N. B. w. to central Alta. and s. B. C, s. to Pa., Ohio, and Wis. Ecology: Can 



be presumed to have been reared from parasites of the following microlepidoptera-- 



Choristoneura fumiferana (Clem.), Sparganothis pettitana (Rob.), Anacampsis 



niveopulvella (Cham.). 

 Stictopisthus lanceolatus Dasch, 1971. Amer. Ent. Inst., Mem. 16: 279. 6, 9. 



Subfamily DIPLAZONTINAE 



The members of this medium sized subfamily are internal parasites of Diptera larvae. The 

 eggs are deposited in the early-instar larvae or eggs of the host, and the adults emerge from the 

 host puparia. The usual hosts are aphidophagous Syrphidae, although phytophagous Syrphidae 

 and even Diptera of other families are sometimes parasitized. 



Revision: Davis, 1895. Amer. Ent. Soc, Trans. 22: 25-27. —Dasch, 1964. Amer. Ent. Inst., 

 Mem. 3: 1-304 (Nearctic spp.). —Dasch, 1964. Amer. Ent. Inst., Contrib. 1 (1): 1-77 

 (Neotropic spp.). 



Taxonomy: Townes, 1971. Amer. Ent. Inst., Mem. 17: 216-232 (genera of world). 



Genus SYRPHOCTONUS Foerster 



Syrphoctonus Foerster, 1868. Naturh. Ver. Rheinlande, Verb. 15: 162. 



Type-species: Bassus exsnltans Gravenhorst. By subsequent monotypy from 

 inclusion by Woldstedt, 1877. 

 Homotropus Foerster, 1868. Naturh. Ver. Rheinlande, Verb. 25: 162. 



Type-species: Bassus elegans Gravenhorst. Desig. by Walkley, 1958 from 29 species 

 included by Thomson, 1890. Walkley (1958) considered the type-species as having 

 been designated by Viereck (1914) when the latter author designated B. elegans 

 as the type-species of Homocidus Morley (Viereck's [1914] designation of B. 

 bicapillaris Walsh as the type-species of Homotropus has no validity because B. 

 bicapillaris was not placed in Homotropus until 1895). The fact that Homocidus 

 (which see) has no standing in nomenclature (and therefore has no type-species), 

 prevents Viereck's (1912) designation of B. elegans as the "type-species" of 

 Homocidus from being the valid designation for Homotropus by isogeneritypy. 

 Homoporus{\) Thomson, 1890. Opusc. Ent. 14: 1488. There is no doubt that Hoynoporus is a 

 lapsus for Homotropus because Thomson used the name Homotropus in his conspectus 

 generum on page 1465 of the same paper. Twelve years earlier Thomson had given the 

 name Homoporus to a genus of Chalcidoidea, which makes it easy to explain how he 

 could have made the error of introducing the name Homoporus in his manuscript which 

 dealt with Homotropus. 

 Homocidus Morley, 1911. Brit. Ichn., v. 4, p. 87. N. name for Homoporus Thomson, 1890. 



This large Neotropic, Holarctic, Oriental and Ethiopian genus was called Homotropus in 

 the most recent works on Diplazontinae. Suppression of Homotropus as a synonym of Syrphoc- 

 tonus is necessitated by the first re visor decision of Benoit (1955) and by the following facts. 

 Viereck (1914) designated Bassus biguttatus Gravenhorst as the type-species of Syrphoctonus, 

 believing that this species was eligible for designation by virtue of Woldstedt's (1877b) place- 

 ment of it in Syrphoctonus along with three other species, including B. exsultans Gravenhorst. 

 However, Woldstedt (1877a) had monotypically included B. exsultans, which makes it the 

 type-species of Syrphoctonus. Syrphoctonus of recent authors is herein called Woldstedtius 

 (which see). 



Taxonomy: Woldstedt, 1877a (1876). Acad. Imp. des Sci. St. Petersburg, Bui. 22: 391. 



-Woldstedt, 1877b. Acad. Imp. des Sci. St. Petersburg, Bui. 23: 441. —Viereck, 1912. Ent. 

 Soc. Wash., Proc. 14: 175. -Viereck, 1914. U. S. Natl. Mus., Bui. 83: 72, 142. 



