a List of the Butterflies of Hong-Kong, 467 
88. Tachyris (Appias) alhina, 
Pieris albina, Boisdv.j Sp. Gen. Lep., i., p. 480, n. 62 
(1836). 
This butterfly was first observed by me on the after- 
noon of April 28fch, 1893, under circumstances which 
appeared to indicate a large immigration of the species 
into Hong-Kong; numerous specimens, nearly all c^^s 
in worn condition, were seen flying about the Ficus 
trees in the city, just before a very heavy thunderstorm. 
A very few ? 's were afterwards taken. 
89. Ixias pyrene. 
Papilio pyrene, Linn., Mus. Ulr., p. 241 (1764). 
Fap. sesia, Fabr., Gen. Ins., p. 257 (1777); Don., Ins. 
China, t. 31, fig. 2 (1798). 
Tolerably common, especially in Happy Yalley,^' the 
pale $ being not at all rare. Fresh examples have been 
met with from December to May, those taken in the 
winter months being small, with the black border of the 
hindwings almost obsolete ; but it is perhaps most 
plentiful in March and April. The Hong-Kong speci- 
mens agree well with the form described by Fabricius 
and figured by Donovan as Papilio sesia, as well as with 
specimens standing under this name in the Godman- 
Salvin collection. The flight of this butterfly, especi- 
ally in the ^, is rapid and erratic, and it is by no means 
easy to catch. 
90. Hehomoia glaucippe. 
Papilio glaucippe J Linn., Mus. Ulr., p. 240 (1764) ; 
Syst. Nat., i., 2, p. 762, n. 89 (1767). 
Worn specimens of this fine butterfly were observed 
by me in December, 1891, and January, 1892, and 
freshly emerged examples were taken on March 5th. 
Its flight is exceedingly strong and wild, but it may 
sometimes be caught while feeding at the flowers of 
Hibiscus rosa-sinensis, to which it is very partial. On 
hot sunny days it is very fond of settling, with closed 
