560 SIDNEY I. KORNHAUSER 
the Thelia. It is during the fifth nymphal instar that prepara- 
tion for the most striking feature of the metamorphosis of the 
homopteran occurs (compare fig. 15 with figs. 5 and 6). The 
Fig. 138 Vittae mounted in balsam, seen in reflected light. a, normal male; 
j, normal female; b to h, inclusive, parasitized males showing various degrees of 
loss of yellow hypodermal pigment (light in color in photographs) and increase 
of melanin in punctures; g and h, complete change; 7, parasitized female. 
16.6. 
sexual differences of the pronota as well as many other remark- 
able changes in the integument appear first at the final molt. 
If, for example, the parasites in a male fifth instar are large 
