206 ENTOMOLOGY 
EiGs22eH 
Pieris protodice; male (on the left) and female (on the right). Natural size. 
are often distinguished by colorational differences and in Hes- 
periidze the males often have an oblique black dash across the 
middle of each front wing. Callosamia promethea (Fig. 
236), the gypsy moth and many other Lepidoptera exhibit 
colordtional antigeny. In not a few Sestidz the sexes differ 
greatly in coloration. Thus in the 
Fig. 235. male of the peach tree borer (San- 
ninoidea exitiosa) all the wings are 
colorless and transparent; while in 
the female the front wings are vio- 
let and opaque and the fourth ab- 
dominal segment is orange above. 
The same sex may present two 
types of coloration, as do males of 
Cyaniris pseudargiolus and females 
of Papilio glaucus, already men- 
tioned. Papilio merope, ot South 
Africa, is remarkable in having three 
Cohae Ghilédice> aivht. thre temaales.( Frontispiece, Wigsi5.. 70, 
wing of male (above) and of yy) which are entirely different in 
female (below). Natural size. ; . = 
coloration from one another and 
from the male. There is no longer any doubt, it may be 
added, as to the specific identity of these forms. 
Next to Lepidoptera, Odonata most frequently show col- 
orational antigeny. The male of Calopteryx maculata is vel- 
