GENERIC NAMES OF BUTTERFLIES 147 



first devised the name Dipsas. Doubleday would no doubt have used this name in his 

 Genera of Diurnal Lepidoptera if he had not been prevented from doing so by his premature 

 death. Thus it was left to Westwood to be the first validly to publish this name. 



Westwood cited only one species, Dipsas ataxus, on plate 74 of his continuation of Doubleday 's 

 book, and (as stated above) that species is automatically the type-species of Dipsas by mono- 

 typy. This plate was published on 5th December 1851. The text relating to this name 

 which appeared on page 480, was not issued until 4th .March 1852. (For the determination 

 of these dates see Hemming, 1941, /. Soc. Bibl. vat. Hist. 1 : 439-440.) In the text Westwood 

 placed eleven nominal species in this genus, the first of these being Thecla sita Kollar, [1844], 

 which he designated as type-species. This designation is invalid, because already three 

 months earlier Dipsas ataxus had become the type-species of this genus through its name 

 having been published on plate 74. 



The name Dipsas Westwood is invalid under the Law of Homonymy, the word " Dipsas " 

 having been introduced as a generic name by three previous authors. These earlier names 

 are the following : (a) Dipsas Laurentius, 1768 {Syn. Rept. : 89) ; (b) Dipsas Leach, 1814 

 [Zool. Miscell. 1 : 119) ; (c) Dipsas Rafinesque, 1X20 (Ann. gin. Sci. phys., Bruxelles 5 : 317). 



DIRA Hiibner, [1819], Verz. bekannt. Schtnett. (4) : 60. Type-species by selection by Scudder 

 (1875, Proc. amer. Acad. Arts Sri., Boston 10 : 157) : Papilio clytus Linnaeus, 1764, Mus. 

 I Aid. I'lr. : 268. 



DIRCENNA Doubleday, [1847], Gen. diurn. hep. (1) : pi. 17, fig. 2. Type-species by mono- 

 typy : Dircenna iambe Doubleday, [1847], ibid. (1) : pi. 17, fig. 2. 



In the text (: 121) published in September 1847, that is, about two months after the 

 publication oi plate 17, Doubleday cited five nominal species under the name Dircenna ; 

 but, apart from Dircenna iambe, none of these would have been eligible for selection as type- 

 species, even if the name Dircenna had first been published in the text instead of on plate 17, 

 for of the remaining four one was ,1 manusi rip! spei Les and the other three were only doubt- 

 fully referred to the genus. 



The taxon represented by the nominal species a iambe Doubleday is currently 



considered subjectively on taxonomic grounds to be the same as that represented by the 

 older-established nominal species Ceratinia jemima Geyer, [1837], in Hiibner, Zutr. z. Samml. 

 exot. Schmett. : 6, pi. [139], figs 807, 808. 



DIS Mabille, 1889, Bull. Soc. enl. Fr. 1889 : rlxxxiv. Type-species by monotypy : Dis an- 

 nulatus Mabille, 1889, ibid. 1889 : clxxxiv. 



The taxon represented by the nominal species Dis anniilalus Mabille is currently treated 

 subjectively on taxonomic grounds as representing the same taxon as that represented by the 

 older-established nominal species Oxynetra koppferi Staudinger, [1888] in Staudinger & 

 Schatz, Exot. Sclnnett. Th. 1 (Bd 1) : 294. 



DISCOLAMPA Toxopeus, 1929, Tijdschr. lint. 72 : 232. Type-species by monotypy : 

 Lycaena ethion Westwood, [1851], in Doubleday, Gen. diurn. Lep. (2) : pi. 76, fig. 3 ; id., 

 [1852], in Doubleday, ibid. (2) : 490. 



The present name, together with certain other names published in the same paper, was mark- 

 ed by the formula " Tox.i.l. (Treubia 1929?) ". thereby indicating (apparently) that Toxopeus 

 regarded the publication of the name on this occasion as a mere anticipation of its substantive 

 publication in the serial " Treubia." In fact, however, this and the other names concerned 

 were never published in Treubia in 1929 or later, and it was in the present paper in the Tijd- 

 schr. Ent. that this and the other names were first published. 



DISCOPHELLUS Mabille, 1903, in Wytsman's Gen. Ins. 17 (A) : 30 (an Incorrect Subsequent 

 Spelling of Dyscophellus Godman & Salvin, [1893]). 



DISCOPHORA Boisduval, [1836], (Roret's Suite a Buffon), Hist. nat. Ins., Consid. gen. 1 

 Lepid. : pi. 4 [ = 4a], fig. 12 (larva etpupa) (as Discophorus) , pi. 12 [ = 8B], fig. 3 (as Discophora) . 

 Type-species by selection by Scudder (1875, Proc. amer. Acad. Arts Sci., Boston 10 : 158) : 

 Papilio menetho Fabricius, 1793, Ent. syst. 3 (1) : 83-84. 



