384 



THE BUTTERFLIES OF THE 



A of an inch in diameter. Color dull translucent white. 

 Surface faintly aciculate, sparsely armed dorsally with 

 minute, evenly-distributed, short, rufous bristles, spring- 

 ing from the general surface, and not very noticeable 

 with the naked eye ; covered more or less copiously with 

 a white, glistening, powdery secretion of a waxy nature. 

 Cylindrical; the abdominal joints with eight annulate 



Fig. 92. 



as 



Megathymus Yucca;: a, egg, side-view, enlarged; 6, egg from which the larva lias 

 hatched ; bb, bbb, unhatched eggs, natural size ; c, newly-hatched larva, enlarged ; 

 cc, full-grown larva, natural size ; d, under side of head of same, enlarged to show 

 the trophi. 



or transverse wrinkles to each joint, — the first three oc- 

 cupying the anterior half, the third more prominent and 

 widening laterally, and the other five on the posterior 

 half of the joint, all best defined dorsally. The thoracic 

 joints somewhat larger than the rest, more deeply and 

 irregularly wrinkled ; the substigmatal region with lon- 

 gitudinal folds. Head black, perpendicular, and aspe- 

 rous or deeply shagreened ; epistoma and labrum brown, 

 small, and usually with a transverse median ridge, the 



