DAY-FLYING MOTHS. 



FIG. 37. Yucca borer (Megathymus yucca), in 

 flight and in repose ; from the United 

 States. 



It is a sad-coloured moth, and rests 

 with wings elevated thus differing from 

 the typical Castniidse its antennae gene- 

 rally directed forwards ; also in smaller 

 wings, in smaller, closer scales, in un- 

 armed hind-wings, and in stiffer, 

 relatively shorter, antennae, it 

 diverges in character from the Castniidae (see Fig. 37). 

 Its flight, which is diurnal, is an extremely rapid darting 



