94 P. W. WHITING AND ANNA R. WHITING. 



diheterozygous mother, OoD n d II95 , had mated only with type 

 brothers. Ocelli may have been either of paternal or of maternal 

 origin. The male was absolutely sterile, although very active 

 and willing to mate. It was kept alive forty days and mated 

 to twenty-one females. There were produced no females among 

 757 males. Dissection showed testes to be unattached. There 

 was a single vas deferens ending blindly on one side, none on 

 the other. Penis and all external parts were normal. 



While no evidence exists as to the origin of the black ocelli 

 it may be tentatively assumed by analogy with succeeding cases 

 that this male arose from an unfertilized egg. Oocyte divisions 

 may be represented as follows: 



First polar body OoD n (D n ) 



Cleavage nuclei O(d II95 ) o(d II95 ) 



As regards orange the first division was equational, the second 

 reductional. We know that d II95 remained in the egg for r 4 

 veins were both defective but other tissues might have had 

 either D H or d II95 . As regards defective therefore, the first 

 division may have been either reductional or equational. Allelo- 

 morphs set in parentheses may be exchanged in the formula. 



Freak 256. An Fi female, od II95 wOD n W, of those mentioned 

 under Origin of freaks 250, etc., produced males type 24, 

 defective 8, wrinkled and wrinkled defective 20, orange 9, 

 orange defective 8, orange wrinkled and orange wrinkled de- 

 fective 14, and females type 67, defective 8, and a male (freak 

 256) with normal r 4 vein, flat wings and mosaic eyes appearing 

 in vial / (February 19, 1924). Eyes are shown in Figs. 5 and 

 6. The antennae of this male had probably been injured by 

 too much ether. It seemed impossible to obtain a mating. 

 Histological preparation showed internal organs apparently 

 normal. 



His origin may be represented as follows: 



First polar body Ood II95 (d II95 )w(w) 



Cleavage nuclei O(D n )(W) o(D n )(W) 



As regards orange the first division was equational, the second 

 reductional. Because of lack of adequate test, the case for 



