206 Dr. P. A. Dixey on 



1897 

 April 3. Put two pupas (« and h) in dry furcer ; two 

 more {c and d) in damp tin ; and left three 

 (c, / and g) in breeding-cage. 

 „ 9. Took c and d out of damp tin, as they 



showed signs of emergence. 

 „ 10. a, c and c emerged in the morning, a was 

 a female of the yellow form, showing an 

 approach to the dry-season form in a 

 slight reduction of all the black spots and 

 borders, especially the discal spot in fore- 

 wings; c was a female of the white form, 

 and iiad all the black spots well marked; 

 c was a white female, intermediate in the 

 development of black markings between 

 a and c. 

 Removed h from forcer to bi'eedina--caefe. 

 „ 11. &, fZ,/ and ^ emerged. ?^ was a white female 

 in which the black markings were not 

 quite so light as those of a, but noticeably 

 lighter than those of c ; d was a normal 

 wet-season male ; / and g were yellow 

 females intermediate in markings between 

 the extreme forms a and c. 

 '^Result. — The differences exhibited are slight, but so far 

 as they go they apparently tend to show that the effect 

 of dry heat is to reduce the black markings, and that of 

 cool moisture to enhance them. It is to be observed that 

 yellow and white forms of the female occur at both seasons, 

 the deeper yellow specimens are however more prevalent in 

 winter. Reliable seasonal distinctions are greater or less 

 development of the marginal black spots and discal spot 

 in forewing, combined with less or greater acuteness of 

 forewing. 



" Experiment with Crenis hoisduvalii. 



1897 

 April 0. Twenty-two larvoe of C. hoisduvalii pupated. 

 „ 10. Put six pupae into dry forcer; six into damp 



tin ; and left the rest in breeding-cage. 

 „ 14. Six piipoe in forcer emerged ; there were 



four male and two female, but two of the 



former were deformed. 



