252 MR. A. G. BUTLER ON NEW BUTTERFLIES. [Mar. 7, 



Genus Ixias, Hiibner. 

 Ixias undatus, sp. n. (Plate XIX. fig. 4.) 



c? . Alee supra fere velut in I. evippe ; fascia autem aurantiaca 

 angustiore magis undata, introrsum ad cellce fnem profunde 

 incisa : posticce fascia marginali angulis altemis profunde sep- 

 temundata : corpus viridi-cinereum, abdomine a latere Jlavido. 



Alee subtus saturatius flavee, immaculatce. 



Exp. alar. tine. 3. 



Labuan {Lowe). B.M. 



Nearly allied to I. evippe of Drury (rhexia, Fabr., and, possibly, 

 ludekingii, Vollenhoven), but with the costa of fore wings more 

 produced. 



Ixias latifasciatus, sp. n. (Plate XIX. fig. 3.) 



5 . Affinis I. sesise, magnitudine I. anexibise ; differt fascia mar- 

 ginali alarum posticarum duplo latiore et introrsum apud api- 

 cem tridentata. 



Alee subtus undique fusco reticulatis ; fascia discali nebulosa 

 maculari fusca : anticce macula magna discocellulari, venis 

 plagaque triangulari anali nigro-fuscis : posticm macula costali 

 aliisque venas terminantibus nebulosis et puncto discocellulari 

 nigro-fuscis ; punctis quatuor inconspicuis discalibus auran- 

 tiacis : corpus favum. 



Exp. alar. unc. 2, fin. 6. 



?. Alee anticee fuscee, plaga magna interna triangulari lactea ; 

 fascia fulva bimaculata velut in I. sesia $, posticce lacteee ; 

 fascia lata marginali apud apicem introrsum tridentata, fusca : 

 corpus cinereum. 



Alee subtus fere velut in mare. 



Exp. alar. unc. 2, lin. 6. 



Moulmein {Clerk). B.M. 



Allied to the preceding species and to J. sesia, Fabr. ; in the 

 dusky hatchings of the under surface, it differs from all the species 

 hitherto described. 



The species of Ixias will now stand as follows : — 



1. Ixias evippe. 



6 . Papilio evippe, Drury, 111. i. pi. 5. fig. 2 (1773). 

 P. rhexia, Fabricius, Syst. Ent. p. 4/6. n. 145 (1775). 



Var. ? Thestias ludekingii, Vollenhoven, Tijd. Ent. iii. p. 126 

 (1860); Monogr. Pier. p. 49. n. 1, pi. 5. fig. 6 (1865). 



2 . Papilio pirithous, Fabricius, Syst. Ent. p. 483. n. 179 (1775). 



P. ulrica, Herbst, Natursvst Schmett. v. pi. 108. figs. 9, 10 

 (1792). 



Thestias rhexia, $, Butler, Fabr. Cat. pi. 1. fig. 5 (1869). 



China, Nepal, Darjeeling. B.M. 



Vollenhoven' s T. ludekingii looks to me like a faded, or, perhaps, 

 an albino male of I. evippe. 



