IV FAM. PIERIM. 
SUB-FAM. PIERINAL 
1. Genus DELIAS. 
2. „ PRIONERIS. 
3. „ TERIAS. 
4. „ IXIAS. 
5. „ HEBOMOIA. 
6. „ CATOPSILIA (callidryas ). 
7. „ DERCAS. 
8. „ PIERIS (ganoris, huphina, catophaga). 
Delias and Hebomoia are Oriental and Australian genera. Terias and Catopsilia are 
represented everywhere in the tropics ; Ixias is Ethiopian, Oriental and Australian. Dercas and 
Prioneris are peculiar to the Oriental Region. Pieris is a universally distributed genus, but 
many of the sub-genera into which it is divided are restricted in their range. As, however, but few 
species are here dealt with, they are all included in Pieris , but the sub-genera are given in brackets. 
The larvae of many butterflies of this Family are gregarious, and nearly always rest on the upperside 
of leaves. The pupae are suspended by the tip of the abdomen, with a girdle round the middle. 
The forelegs are perfect in this Family, and are used for walking. 
Delias hierte, Hiibner 
This pretty insect is sometimes very abundant round Macao, frequenting wooded coun¬ 
try ; near Hongkong it seems to be scarce, and in the whole district it appears to be rather sporadic 
from some obscure cause, for the foodplant of the larva is everywhere plentiful; the larvae, however, 
as will be noted later, are very subject to the attacks of Ichneumon flies, and this may account to 
some extent for the periodic scarcity of the butterfly. Though most numerous in spring and 
autumn this insect is on the wing throughout the year ; it generally flies rather slowly and feebly, 
with the hindwings much drooped, often high up about the tops of trees, and is very fond of 
flowers, especially those of certain trees, where it sometimes gathers in swarms: several butterflies 
feeding at the same time on one flower. It is also much attached to the flowers of Lantana. Usual¬ 
ly it rests with closed wings, showing the brilliant colouring of the underside. Sometimes the 
long-shaped apical spots on the underside of the forewing are very yellow, sometimes nearly white. 
Fig. 14, PI. IX is from a £ taken in January ; Fig. 11 of the same plate the upperside of 
a $ of November : the underside resembles that of the The $ does not appear to vary much 
seasonally, but the $ in the wet form often has the dark brown of the upperside covering a greater 
