1912] Glaser — Nof^ on a Pink Locustid 159 



paign against this insect. The writer has not studied the con- 

 ditions in other cities but would venture the opinion that those 

 which obtain here are in no way pecuhar to this locahty. 



NOTE ON A PINK LOCUSTID. 



'While at Woods Hole, Mass., in August, Dr. A. S. Pearse gave 

 me a pink male Locustid which he found on some blackberry 

 bushes in the vicinity. At the time I received the insect, it had 

 not passed through its last instar and I was very much interested 

 to see whether or not it would retain its beautiful pink color after 

 passing through this final stage. Professor Morgan was interested 

 in the animal, and according to his advice, I constructed a cage 

 over some blackberry bushes in a field, thinking that conditions 

 which were approximately the same as natural conditions might be 

 the most favorable for development. 



The insect passed through its last moult about one week after I 

 had it in my possession and is fully as pink, wings included, as 

 before, with the exception of the eyes which are white and the ven- 

 tral side of the thorax and abdomen which are considerably lighter 

 than the other regions of the body. 



At present we are engaged in attempting to cross this Locustid 

 with normal green ones of the same species in order to find out 

 what the mendelizing characters are. 



Mr. Gray, the curator, found a similar pink form early this 

 summer and, according to Professor Morgan, a yellow form was 

 taken several years ago. This led Professor Morgan to make the 

 suggestion that two factors may be involved, the presence of both 

 of which produces the pink form, the absence of one the yellow and 

 the absence of both factors the ordinary normal green form. 



R. W. Glaser. 



