1880.] J. Wood-Mason — On the Lepuhptcrous Oenns iEmona. 175 



XVIII. — O71 tlie Lepidopterons Qenus ^mona, with the Description 

 of a new Species. — By 3. Wood-Masok. 



(With Part of Plate VI). 



Several years ago, three plain pale-fulvous butterflies of moderate size 

 were forwarded to the Indian Museum by Mr. S. E. Peal of Sibsagar, 

 Assam. All three are of the male sex, and they agree so remarkably 

 closely in size and colour as to have been taken for specimens of one and 

 the same sjDecies. On examination, however, I find that, though super- 

 ficially so similar to one another, they differ in structure and represent two 

 distinct but closely-allied species, one of them being a male (hitherto 

 undescribed) of JEinona Aniathusia, and the other two, males of an 

 undescribed form belonging to the same genus. For the benefit of 

 naturalists in India to whom the costly works in which they occur are 

 inaccessible, I have extracted the original descriptions of the two described 

 species. 



The genus JEmona was established by W. C. Hewitson in 1868 

 for the reception of an insect from Northern India which he had pre- 

 viously described under the name of Glerome Amathusia. Hewitson appears 

 to have had some misgivings as to the propriety of this step, but, as will 

 be seen from the following amended diagnosis, the genus is at least 

 as distinct from Glerome as this is from Thauimntis, or as Zeuxidia from 

 Amathusia. 



Genus ^Emona, Hewitson. 

 Head small. Antennm rather short. Anterior wing acutely pointed 

 and produced, or sharply angulated, at the apex ; its inner margin straight 

 in both sexes, not being lobed at the base in the male as it is in Glerome 

 and less distinctly in Thauiiiantis ; the costal vein reaching to the end 

 of the fifth seventh of the length of the anterior margin ; the subcostal 

 4-branched, the first branch given off just before the end of the cell, 

 and, after running free for nearly the same distance beyond that point 

 as it originates before it, completely coalescing with the costal, but again 

 becoming free just before this last-named vein turns off to the anterior 

 margin, the three remaining branches free. Posterior loing more elongated 

 than, and not quite so rounded as, in Glerome ; without the pencil of 

 erectile setic which, in the males of Glerome and Thaii, mailt is, arises from 

 the wing-membrane of the discoidal cell close to the subcostal vein and lies 

 obliquely across a patch of elevated and crowded scales on the other side 

 of this vein, the male scent-fans, if such are really present in tliis genus, 

 being situated in a different part of the wing, viz., in the aual region, 

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