( cxix ) 



abundant as frequently to outnumber the scales of the ordinary 

 kind. 



In most if not all of the species of this section, the plume- 

 scales are somewhat variable in size and shape, according to 

 their situation ; but all are very long and narrow. Scent- 

 scales from the forewing of Pieris j^haloe have the lamina 

 tapering gradually from the base for about three-quarters of 

 the distance from base to apex ; the sides for the last quarter 

 run nearly parallel. The base is rounded, the apex very nar- 

 row and acute. The laminae of scales from the hindwing tend 

 to be shorter and broader, but retain the same general charac- 

 ter as those from the forewing. In some, the base tends to 

 squareness, and the sides taper i;niformly nearly up to the 

 apex. The ordinary scales are also long ; especially those from 

 the forewing. They show what is a very common if not iini- 

 versal character in the subfamily ; viz. that the distal margin 

 tends to be indented in scales from the upper side of the fore- 

 wing ; smooth in those from the vinderside of the forewing and 

 both surfaces of the hindwing. 



The scales in P. ausin are scarcely to be distinguished from 

 those of P. plialoe ; in P. sevata they are somewhat shorter and 

 smaller. In P. huniae again, the plume-scales are extremely 

 abundant, far outnumbering, in their special situation, the 

 ordinary scales of the wing. They resemble the scales in P. 

 phaloe, and, like them, vary somewhat according to the part 

 of the wing from which they ai-e taken. They can, however, be 

 distinguished from those of that species by the fact that the 

 laminae taper more gradually from base to apex, not showing 

 an attenuated distal portion with sides almost parallel. A 

 species of Pieris from Lower California hitherto undescribed, 

 presents us with the longest plume-scale, except those of two 

 or three species of Hwpliina, that 1 have ever yet met with. 

 It tapers gradually from base to apex just like the similar 

 structure in P. huniae, from which in fact it only differs by its 

 extraordinary length and narrowness. As in other species of 

 this section, the base is rounded and the disc minute. The 

 mealy streaks of the forewing are richly provided with these 

 remarkable scales ; the hindwing, which has no mealy areas, is 

 devoid of them or at least only scantily furnished. The species 



