134 
Psyche 
[Sept.-Dee. 
depends on the position reached by the center of the correspond- 
ing semimacule (this is about s.l. 145, proximal limit, about 
155, average, and about 165, distal). Thus when the latter 
reaches its distal limit (resulting in a narrow interval I, since 
the praeterminal mark cannot wander away beyond a certain 
limit), the increase in the II— I stretch allows macule Cu x a 
Fig. 2. a, b, c, Forewing discal constellation in Lycceides, showing proximal, 
central and distal position of second macule Cm. d, e, f, Cell Cm of forewing, 
showing relation in position between semimacule (inner part of first macule) and 
second macule. 
greater range (at least 40 s.l.). A terminal extension of the 
wing even to only 195 in Cu x may produce a veritable wilderness 
for Cu x to traverse. These phenomena have great racial im- 
portance. 
In the hindwing the position of macule Cu x varies less con- 
