OV NORTH AMERICA. 93 



habit is very abnormal among the Heterocera, especially Zygaenidae and 

 Hombycidae. In form the larva has some resemblance to that of 

 Psychomorpha and Eudryas, and my impression is that its allies must 

 be looked for among such genera as Procris and Ctenucha, and that 

 its true place is intermediate between these two forms. The males fly 

 readily through the hot sunshine round the tops of the oaks, but the 

 females are only occasionally taken on the wing. 



