PINK INSECT MUTANTS 



775 



It will 1)0 noticed that the c]:e()^ra[)hi('al range of the pink Amblij- 

 curi/pha ohlongifoHa is nearly or quite co-extensive with that of the 

 green form, and that the great majority of pink individuals enumer- 

 ated in the list are females. This may be due either to the females 

 of the s|)ecies in general being more numerous than the males, or 

 to the males being much shorter-lived than the females. Careful 

 comparison of the pink with the common green forms fails to reveal 

 any differences, exce])t those of pigmentation. The (^olor of all 

 the aberrant sj>ecimens of Amhlycorypha oblong if alia which I have 

 seen, is very constant, although some of those seen by others have 

 been described as vermilion or crimson. The exquisite tint of the 

 living insect changes rapidly after death and becomes a dull pink- 

 ish brown in the cabinet. Tn green individuals, however, the 

 post-mortem color change Is less marked, so that we are justified 

 in saying that the [)ink pigment is less stable than the green. 



The piidv katydids which have l>een observed in confinement 



(1901) and myself ale green leaver and .Irank ualcr v.ii'h aNi.liiy. 

 and eventually laid (>gu. of the normal form and N.... 17 



and 25 each lived in a jar in niy laboratory tor nearly >ix w(vks. 

 I endeavored to mate No. 17 with a inaif i>l" the uiecii toi'ni, but 

 failed, ])erhaps because tlu> experiment was tried too late in the 



before it was placed in ilic jar with the female. The eggs laid by 

 this insect a few (hiy. l.rloii- hci- death were not fertilized.^ No. 25 



while she was still in T.eidy's possessioil. 



It .seem, not to be generally known that, in addition to the green 

 and pink forms, both A mhli/mri/pha mlumli/nlia and A.uhlongi- 

 folia have also a brown pha>e. Mr. William T. Davi^ lias geuer- 



