E. J. Allen and E. W. Sexton 365 



togetfier all the offspring have been invariably unspotted No-whites. This 

 applies to all such raatings which amount to many hundreds — to Coloured 

 No-whites, both those pure for Colour and those carrying Albino, and 

 to Albino No- whites whether mated together or with Coloured No-whites. 



We have never succeeded in rearing two spotted No-whites to 

 maturity at the same time, so that it has not been possible to mate 

 them. 



We also obtained a number of animals in which one eye only was 

 No-white, which also carried spots, generally on the same side as the 

 No -white eye. The spots were very large, usually very deep in the 

 tissue, and nearly always in the same definite positions (4, 6 and 2 on 

 on the diagram, p. 353) ^ 



Altogether 59 spotted one-sided No- whites appeared in the different 

 strains; of these 15 had lateral spots, i.e. position 4 on the same side 

 as the No-white eye ; 8 on the same side lateral and dorsal ; 4 on the 

 1st peraeon-segment on the same side; 3 on the same side, lateral and 

 peraeon-segment; 6 on the same side, lateral, dorsal and peraeon-segment; 

 2 on peraeon-segment same side and dorsal ; 7 on both sides, lateral ; 

 1 dorsal; 6 on the opposite side lateral; 4 on the peraeon-segment 

 same side and opposite side lateral ; 2 on the peraeon-segment opposite 

 side ; and 1 on opposite side lateral and dorsal. When the two eyes 

 are different therefore in respect of No-white, spots tend to be more 

 frequent on the No- white side ; a point of interest when it is remembered 

 that unspotted pure No-whites have never been known to give spotted 

 offspring. 



Matings in which one parent is an Albino spotted dorsally and the 

 other a No-white are of special interest on account of the high percentages 

 of spotted offspring. 



An instance may be given of one Coloured No-white male mated 

 with three Albino females, descendants of C. 17 6, all with large dorsal 

 spots, the third having a spot also, left side, position 5. 



With female 1, which carried Black and Red, the offspring produced 

 were 29 normal-eyed unspotted, 23 normal spotted and 1 spotted No- 

 white ; a percentage of 45*3 spotted. 



With female 2, which carried Black, there were 75 normal unspotted 

 and 31 spotted (1 No- white) ; a percentage of 28*9 spotted. 



With female 3, which carried Black, there were 32 normal unspotted 

 and 10 spotted ; a percentage of 23*8 spotted. 



1 In the next paragraph spots in position 4 are described as " lateral," in position 6 as 

 " peraeon-segment," and in position 2 as " dorsal." 



