386 



THE BUTTERFLIES OF THE 



FIG. 93. 



hind part of the fourth abdominal segment. Surface 

 but slightly polished, and faintly corrugate ; a few ex- 

 tremely minute, bristle-like spines distributed over the 



abdominal joints dorsally, and the two 

 or three terminal joints with stiff rufous 

 hairs, increasing posteriorly. Color 

 black-brown anteriorly, paler on the 

 abdomen, and more or less densely 

 covered with a white powdery secre- 

 tion like that on the full-grown larva. 

 There is but one brood in a season, 

 the butterflies appearing in April and 

 May. The eggs hatch in about ten 

 days, but the larva does not pupate till 

 late in the following winter or early in 

 the spring. The burrow often extends 



^ WQ f ee Qr more below the Surface of 



the ground. Before pupating, the larva 

 makes a place of exit for the butterfly, lightly closing 

 this cavity near the top. It then makes a cell suf- 

 ficiently farther down to give it room enough to pupate, 

 and in this it undergoes its transformations. 

 Southern States, New Mexico, Arizona. 



201. MEGATHYMUS COFAQUI, Strecker. 



Expanse of wings from 2.25 to 2.6 inches. 



This differs from M. Yuccce in having more yellow at 

 the base of the wings, the female having the yellow spots 

 in and above the cell of the fore wings connected in a 

 continuous row with those below instead of the spots be- 

 yond the cell, and the anteapical spots making up with 

 these the row across the wing. This is due to the greater 



Megathymus Yuccae, 



