166 FRANCIS HEMMING 



ERCHIA Walker, 1854, List. Spec. lep. Ins. Brit. Mus. 2 : 357. Type-species by monotypy : 

 Erchia extranea Walker, 1854, ibid. 2 : 357. 



Walker used the name Erchia as a new generic name twice in the same volume, namely the 

 present name Erchia (: 357) and Erchia (: 321), this latter being applied to a genus of Dioptid 

 moths. For names such as these published in the same work and on the same date, the 

 relative precedence to be accorded depends on the choice made by the First Reviser. In this 

 case the First Reviser was Kirby when in 1892 (Syn. Cat. Lep. Het. 1 : 410) he gave precedence 

 to Dioptid Erchia (: 321) over the present Erchia, introducing for the latter the replacement 

 name Pseuderchia. 



In introducing the present name, Walker erroneously supposed that its type-species, Erchia 

 extranea, was a Geometrid moth, whereas in fact it is a Riodinid butterfly. In consequence 

 of the way in which these names were published by Walker, they have been completely over- 

 looked in the literature of the butterflies. The true nature of these taxa only came to light 

 recently in the course of work in the British Museum (Natural History), as I was informed by 

 Mr. N. D. Riley when he kindly drew my attention to these hitherto unknown names. If the 

 discovery of these ancient names had led to the upsetting of names in current use, there would 

 have been a very strong case for asking the Commission to reject them as nomina oblita. 

 Fortunately, however, such action is not required in the present case : — (i) The generic name 

 Erchia Walker, as applied to the Riodinid butterfly, is (as shown above) invalid under the 

 Law of Homonymy. (ii) The nominal species Erchia extranea Walker (the type-species of 

 Erchia) is subjectively treated as representing the same taxon as that represented by the older- 

 established nominal species Limnas barca Hewitson, [1853 (///. exot. Butts 1 : [120], pi. 60], 

 fig. 12), and in consequence the specific name extranea Walker falls as a junior subjective 

 synonym of barca Hewitson. (iii) The generic name Pseuderchia Kirby, 1892, typified as 

 indicated above, is a junior subjective synonym of Melanis Hiibner, [18 19] a genus commonly 

 but incorrectly known by the name Lymnas Blanchard. 



EREBIA Dalman, 1816, K. svenska VetenskAkad. Handl., Stockholm 1816 (No. 1) : 58. Type- 

 species by original designation : Papilio ligea Linnaeus, 1758, Syst. Nat. (ed. 10) 1 : 473. 



Dalman, who wrote of this genus " Generis Typus : P. ligea ", was one of the earliest 

 authors to designate type-species of new genera in this explicit way. 



EREBINA Bryk, Ark. Zool. 36A (No. 3) : 15. Type-species by original designation : Erebina 

 simplex Bryk, 1944, *&*^- 36A (No. 3) : 15, pi. I, fig. 4 o"- 



EREBIOLA Fereday, 1879, Ent. mon. Mag. 16 : 128. Type-species by original designation : 

 Erebiola butleri Fereday, 1879, ibid. 16 : 129, pi. 1, fig. 4 <J. 



EREBOMORPHA Elwes, 1899, Trans, ent. Soc. Lond. 1899 : 351. Type-species by mono- 

 typy : Papilio parmenio Rober, 1809, Mem. Soc. imp. Nat. Moscou 2 : 306, pi. 19 (2 figs.) 



The name Erebomorpha Elwes is invalid, as it is a junior homonym of Erebomorpha Walker, 

 i860 (List Spec. lep. Ins. Brit. Mus. 21 : 494). 



ERESIA Boisduval, [1836], (Roret's Suite a Buffon), Nat. Hist, his., Consid. gen. 1 (Lepid.) : 

 pi. 11 [= pi. 7B], fig. 8. Type-species by monotypy : Nereis eunice Hiibner, [1807], Samml. 

 exot. Schmett. 1 : pi. [9]. 



The genus Eresia was founded solely upon the figure cited above. At the foot of the plate 

 there appeared only the name " Eresia eunica " without any author's name cited, but in the 

 six-page leaflet entitled " Explication des Planches " Boisduval added the name of Hiibner 

 as that of the author of the specific name. Boisduval's figure represents a specimen of the 

 taxon represented by the nominal species Nereis eunice Hiibner. It is clear therefore that it 

 was this nominal species which Boisduval placed in his genus Eresia and not a new nominal 

 species of his own. (Boisduval spelled the specific name eunice as eunica; as he gave no 

 explanation of this variant spelling, it ranks not as an Unjustified Emendation but as an 

 Incorrect Subsequent Spelling.) 



