GENERIC NAMES OF BUTTERFLIES 145 



DICROGONIDIA [Stichel] Strand, 1932, Folia zool. hydrobiol, Riga 4 (1) : 145. 



This is no more than a ghost name which owes its appearance in the literature entirely to a 

 mistake by Strand. The circumstances in which it made its appearance are as follows. 

 In a list of generic names omitted from the Nomenclator Animalium then in process of being 

 published by the Berlin Academy of Sciences Strand included what he believed to be a generic 

 name Dicrogonidia Stichel, for which he gave the reference " Gen. Insect., fasc. 112, A. 

 p. 54 ". The livraison of the Genera Insectorum cited deals with the butterfly family Riodini- 

 dae, and in it Stichel gave an account of the genus Mesosemia Hiibner, this account beginning 

 on page 37 and ending on page 63. In accordance with a common custom of his, Stichel divi- 

 ded this genus into a series of primary divisions which he called " Sectiones ", subdividing 

 these into a subsidiary category which he termed a " Conors ". To each member of these 

 categories he applied a Latin or Latinized designation in the nominative plural. The word 

 " Dicrogonidia " was attached to the second of three " Sectiones ". It was not used as a 

 generic name at all. 



D1CROSEMA Bryk, 1953, Ark. Zool. (n.s.) 5 : 143. Type-species by monotypy : Dicrosema 

 quadrifenestrata Bryk, 1953, ibid, (n.s.) 5 : 143. 



Evans, the only author to have commented on this nominal genus and species expressed 

 the view (1955, Cat. amer. Hesp. Brit. Mux. 4 : 478) that the taxon represented by the nominal 

 species Dicrosema quadrifenestrata Bryk was the sum- .is th.it represented by the nominal 

 species Anisochoria bahia Evans, 1953 [loc. cit. 3 : 167, pi. 45, fig. E. 59. 5 (^ genit .)), to which 

 he sank Dicrosema quadrifenestrata Bryk as a junior synonym. He did not notice however 

 that these names were both published in the same*year and therefore that, in order to determine 

 the relative precedence to be given to them, it would be necessary to know in what month 

 each was published. This matter has now been examined with the following result : (i) The 

 part of the Ark. Zool. containing the name Dicrosema quadrifenestrata Bryk was published on 

 12th August 1953 ; (ii) The volume of Evans's Catalogue containing the name Anisochoria 

 bahia Evans was published on 27th November 1953. Accordingly, on the basis of Evans's 

 subjective identification of the taxa represented respectively by these nominal species, the 

 species here in question should be known by the specific name quadrifenestrata Bryk. 



DIDON1S Hiibner, [1819], Verz. bekannt. Schmett. (z) : 17. Type-species by selection by 

 Scudder (1875, Proc. amer. Acad. Arts Sci., Boston 10 : 156) : Papilio vitellia Stoll, [1781], 

 i>i Cramer, Uitl. Kapellen 4 (30) : 116, pi. 249, figs E, F. 



The name Didonis Hiibner was formerly widely used as though its tvpe-species was the 

 Nymphalid species Papilio biblis Fabricius, 1807, but this usage was incorrect, Scudder, the 

 first author to select a type-species, having (as shown above) selected the Satyrid (Elymniine) 

 Papilio vitellia Stoll. Fortunately, no ill-result was involved in the correction of this mis- 

 usage : (i) because the name Didonis Hiibner could not in any circumstances have been 

 validly used lor Papilio biblis Fabricius, 1775, since that species is the type-species of the older- 

 established nominal genus Biblis Fabricius, 1807 ; (ii) because the fact that the true type-spe- 

 cies of Didonis Hiibner is an Elymniine Satyrid gives rise to no confusion, since according to 

 modern taxonomic ideas Papilio vitellia Stoll, the type-species of Didonis Hiibner is con- 

 generic with Elymnias jynx Hiibner (better known as itiidularis Drury), the type-species of the 

 older-established nominal genus Elymnias Hiibner, 1818. Thus, Didonis Hiibner is a junior 

 subjective synonym of Elymnias Hiibner. 



DIDYMAEFORMIS Verity, 1950, Farfalle diurn. d'ltal. 4 : 89, 90. Type-species by original 

 designation : Papilio didyma Esper, [1777], Die Schmett. 1 (7) : 41, fig. 3. 



DIESTOGYNA Karsch, 1893, Berl. ent. Z. 38 (1/2) : 181. Type-species by original designa- 

 tion : Aterica tadema Hewitson, [1866], ///. exot. Butts 3 : [53], pi. [27], figs 10, n, 12. 



DILIPA Moore, 1857, in Horsfield & Moore, 1857, Cat. lep. his. Mus. East India Coy (1) : 201. 

 Type-species by monotypy : Apatura (?) morgiana Westwood, [1850], in Doubleday, 

 Gen. diurn. Lep. (2) : 305 nota. 



