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SEXUAL CHARACTERISTICS OF THELIA ro T9T9) 
show this variation. Yet, in spite of this lack of uniformity, 
the vitta is always present in normal males and the rest of the 
pronotum is a uniform brown. The light areas in figure 5 out- 
Fig. 5 Normal male Thelia bimaculata. X 6. 
Fig. 6 Normal female Thelia bimaculata. X 6. 
side the vitta are merely reflections of light. The whole pro- 
notum is covered with coarse punctures which are nicely seen 
on the vitta of figure 5. If, now, we examine a vertical section 
of a portion of the pronotum, including part of the vitta and 
