No. 644] MUTANT CHARACTERS IN DROSOPHILA 



227 



2. Serrate (st) 



Description. — Serrate is an allelomorpli of deformed, 

 but involves only a part of the characters modified by 

 deformed. The changes in the eyes of the two sexes 

 are exactly the same as those caused by deformed. On 

 the other hand, the bristles and the shape of the scutel- 

 lum &re almost normal and the thoracic hairs are only 

 slightly disarranged. The wings may occasionally be 

 held at an angle with the body, but the venation is prac- 

 tically normal. The only strikingly noticeable effect of 

 serrate is the change in the eyes. 



The compound deformed-serrate females are inter- 

 mediate between the tAvo allelomorphs but tend to re- 

 semble serrate more closely than deformed. Serrate flies 

 are more viable than deformed and breed more readily. 



Origin. — A single male was found in an Fo mass cul- 

 ture from a mating of two females by one male from 

 scute stock. No other serrate flies appeared in this cul- 

 ture or in a sister culture. 



Biminr.J ( rl) 



Description.— In rimmed flios, ;i hvAvy l ini of marginal 

 hairs surrounds each wing and the wings curve down 



