4 Journal New York. Entomological Society. [Voi. x. 



pupae were again transferred to ice, the remaining ones left to normal 

 development ; these latter rendered only two perfect imagines, male 

 and female. The primaries of the male have the black color above 

 not more produced than some of the darker varieties of the regular 

 forms; the hind wings are more pinkish than white, somewhat dia- 

 phanous with numerous maculations. Below the resemblance to the 

 aberrative female parent is plain, not only have the primaries a dusky 

 shade spreading from the root of the wing towards median space, ob- 

 scuring the pale color, but the two rows of ventral spots are also con- 

 fluent into broad bands. The female has the dusky shade below also, 

 but in a less degree and with large normal broods females are always 

 found with a similar dusky shade ; the lateral and ventral abdominal 

 spots unite to broad bands leaving only a narrow median line con- 

 nected with the limited transverse lines between the black bands. 

 Those pupae retarded by cold rendered imagines behind the normal 

 size, the abdomen with all of them banded ventrally, primaries not 

 materially changed but the black color more prevailing than in nor- 

 mal forms, hind wings even with males pale pinkish, subdiaphan- 

 ous with profuse maculations. Below, the black of primaries mostly 

 dominant, the pale bands greatly reduced. 



EXPLANATION OF PLATE L 



Normal male. 



Normal female. 



Male ; pupa exposed to -\- 35 to 42° C. from July 4-10; imago, July 13. 



" " " " " " 100 hours ; imago, July 15. 



Female; " " " " " " " July 16. 



" " " " " " " June 20-27 ; imago June 30. 



Male; pupa on ice, July 30- August I ; imago, August 13. 



Female; "' " " " " August II. 



Male; " " " '■ " " August 13. 



Female; " June 23-July 21. -f- 14" C July 21-August 10. 



-f- 22° C. until imago, August 18. 



Fig. II. Female, pupa on ice for 7 weeks. 



Fig. 12. ^ Melanotic form. Larva collected. Nov.; reared on Cichormm 

 endivia. Imago January 13. 



Arctia nais Drurv. 



The species of the group Apantesis W'lk. (Dyar, Revision of Bom - 

 byces), besides many other congenial qualities, show a most indiffer- 

 ent, careless way in distributing their eggs. They may be deposited 



