304 ENTOMOLOGICAL NEWS. [December, 



the mountain representatives the apex is pretty well rounded 

 in both sexes. Also in the valley specimens, the veins are 

 grey and distinct and a very decided dash of grey at the bases 

 of the wings, while in those of the heights, the wings are uni- 

 formly concolorous, with very little grey at bases. Now 

 whether my specimens are P. oleracca or P. pallida, or both, or 

 neither, is for someone else to decide, but what engages my 

 speculation is ; Why did the valley butterflies disappear ? Is 

 is possible that they could have been assimilated by the ever- 

 increasing numbers of a Pieris supposed to have no indigenous 

 representative on this continent, or has it been proved by ex- 

 periment that P. rapcE will not cross with any variety of P. 

 napa f As observations — as to the elimination of P. oleracea 

 from the fauna of other localities — have been reported, the 

 matter seems to me to present an interesting theme for further 

 investigation. 



Our local form of Anthocharis sara is a variety that seems to 

 be intermediate between stella 2ind.julia. The extent to which 

 it diverges from these may be noted in our figures (PI. XIII, 

 No. 3 $ , No. 4 9 ) by comparing these with the figures of 

 the types in Dr. Holland's book. 



I have also figured (No. 5) what I take to be a form of 

 Anthocharis ausonides, but whether a fixed variety, or merely a 

 heavily marked and under-sized aberration, I am unable to say.* 



Figures i and 2 represent an interesting aberration of an 

 Argynnis, Tprohahly pla Una, of which only one specimen was 

 found, whereas I have taken four specimens of the Anthocharis 

 shown in Fig. 5. 



In conclusion, I wish to acknowledge my indebtedness to 

 Dr. Henry Skinner and to Prof. A. J. Snyder for the identifi- 

 cation of many species and the kindly interest shown in mat- 

 ters relative to which they have been addressed. 



Eggs of Thyridoptcryx cphcmcracformis. 



By A. GiRAULT. 

 During the winter, besides collecting pupae and rearing, I 

 have counted the eggs from twenty cocoons of the bag-worm 



* I take this to be ausonides var. lotta Beutenmuller (Skinner). 



