Mar., '07] ENTOMOLOGICAL NEWS. 79 



When the final color change occurs, the dark anterior region 

 becomes dark brown; and the most important elements of the 

 color pattern are longitudinal dark lines, of which there are 

 five usually well marked: a median dorsal, two laterals, and 

 two which lie more ventrally to either side of the median 

 ventral line. The latter is marked by only a few dark dots 

 back of the apices of the wings. The paler dorsal areas lying 

 between these darker lines are marked with small black dots 

 which seem to occupy the same relative position on the seg- 

 ments as the black tubercles on the larvae. See Figures 2, 3 

 and 4. The wing cases also bear dots lying in rows exactly 

 above the veins of the wings, and a submarginal row between 

 the veins. The antennae are also outlined by rows of minute 

 dots. 



Experience has shown that there is considerable variation 

 in the minute markings of both larvae and pupae, and more 

 detailed accounts are of little value for this reason. 



The habits of the imago and the full-grown larva in 

 their native habitat are worthy of careful study wherever this 

 interesting species may be found. The species is monogo- 

 neutic, and the butterfly is on the wing from early in April to 

 the end of May, depending on the season. Thus the pupal 

 life extends over a very long period. 



The conditions of life are extremely rigorous in this region. 

 The temperature extremes of summer and winter are excessive 

 and subject to great and sudden changes ; the relative humidity 

 is low, even as low as 30 per cent, at times; the sand blast is 

 strong enough to erode the standing trunks of dead trees ; and 

 enemies, such as tiger-beetles and ants, abound. It is there- 

 fore of interest to learn where in such a region the pupa would 

 spend ten months of the year. 



( )n May 26th a number of half-grown larvae were located, 

 and on June 1st the region was visited again. Most of the 

 larvae had disappeared, but at one of the stations a single larva 

 remained. It was already purplish, which indicated that it 

 was ready to leave its food plant. Carefully removed from 

 the plant to the ground it was allowed to go whither it would. 

 It crawled along usually on some plant stems a few inches 



