25S Wood Mason & cle Niceville — On tJ/e Rlwpaloccrous [No 4, 



exceedingly prominent in some and totally wanting in others ; not a single 

 character, in fact, which we have chosen in our attempts to divide our series 

 into local races has proved to he constant. 



120. Plesioneura praba. 



P.praba, Moore, Proc. Zool. Soo. Lond. 1865, p. 790, <? 9. 

 Three males from S. Andaman. 



121. Hesperia cahira, Moore. 



The three females have, in addition to the eight spots present in males, 

 a more or less well-developed triangular bright yellow opaque one touching 

 the submedian rather beyond the middle of this, and appearing on the under- 

 sides as an imperfect band between that vein and the first median veinlet ; 

 and, moreover, have the whole underside thickly and evenly clothed with 

 rufous- brown scales. 



122. Hesperia oceia, Hewitson. 



$ . Wings above rich dark purple-brown with bronzy reflections. 



Anterior wings typically with eight semitransparent pale yellow lustrous 

 spots, namely, two, dot-like, at the end of the cell, of which the posterior 

 is the larger, a third subquadrate, the largest of all, between the first and 

 second median veinlets, a fourth, about half the size, between the second 

 and third median veinlets, with a dot, the fifth, beyond and in front of it, 

 and a series of three dots, the sixth, seventh, and eighirh, in a series, in front 

 of this again. 



Posterior wings each with a conspicuous tuft of long dark brown pale- 

 based setae inserted into the wing membrane immediately behind the base 

 of the subcostal trunk. 



Wings below lighter and duller. 



Anterior wings with a huge oval ashy patch of a most brilliant 

 satiny lustre, occupying the middle four fifths of the portion of the organs 

 between the median vein and the posterior margin, and in the middle of 

 which is so placed as to be divided by the submedian vein a very much 

 smaller oval patch of brown modified scales. 



? . W T ings above paler and scarcely at all suffused with purple, with 

 the setae olive-green and the cilia pale luteous. 



Anterior pair all but invariablv with nine spots, an additional opaque 

 one being present just in front of the submedian vein a little beyond the 

 middle of the organs. 



Wings below pure dead uniform olive-brown. 



Length of anterior wing <? -74, ? -86 ; whence expanse = & 1*63, 

 9 1-88 inches. 



In the male of this species the basal tuft on the upperside of the pos- 

 terior wings probably serves as the scent-fan, while the patch of modified 

 scales on the underside of the anterior ones covers, and collects sponge-like 

 the odorous fluid secreted by, subjacent glands. 



