ERONIA. 203 



moderate extent, which is confined to the tropics of the Old 

 World. The African species are extremely dissimilar, and evi- 

 dently belong to several genera, while the Eastern group is more 

 compact. The costa of the fore-wings is arched, and the sub- 

 costal nervure is five-branched, the two first branches rising near 

 together before the end of the cell, and the others separating 

 towards the tip of the wing. Three of the African groups have 

 received names : Eronia (type E. ckodora^ Hiibner) ; Dryas- 

 Boisduval (pre-occupied), proposed for Eronia leda^ Double- 

 day, which Butler and Trimen both include in Eronia ; and 

 Nepheronia, Butler, intended to include the remaining African 

 and Eastern species. Mr. Trimen has lately proposed to in- 

 clude the African species in Eroma, and to leave the name 

 Nepheronia to the Eastern species, but this is impossible, for 

 Dr. Butler expressly indicated N. idotaa, Boisduval, as the type 

 of his genus. I therefore propose to employ these two genera 

 in the sense in which they were used by Dr. Butler, quot- 

 ing the characters, which he gives for them, and noticing 

 the types and some of the principal forms which they 

 include. 



Dr. Butler characterises Eronia as follows, specifying 

 E. deodora, Hiibner, as the type, but including E. teda, 

 Doubleday, in the genus : 



"Front wings broad, sub-triangular, with strongly arched 

 costa ; first and second sub-costals emitted near together at 

 some distance before end of cell, the third at a great distance 

 beyond end of cell, the fourth and fifth forming a short fork 

 to the apex ; upper [the second, the first being obsolete] disco- 

 cellular about one-third the length of lower, both arched, and 

 forming a nearly perpendicular line ; median branches at 

 nearly equal distances apart. 



" Hind-wings : Upper disco-cellular about one-quarter the 

 length of lower, oblique ; the lower disco-cellular also oblique, 



