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THE AMERICAN NATURALIST [Vol.XLVII 



In Castle's paper of 1905 he gives the result of certain 

 matings between black-red and black-red. Combining 

 the result from two tables (pages 34 and 36) there is a 

 total of 20 black-reds and 9 reds. It may be doubted 

 whether Castle's black-reds are always the same as our 

 tortoise, because he speaks in the text (page 32) of a 

 reddish-black (1,179) and (1,180), but in the table stamps 

 them as black. One parent of these animals was black; 

 the other red. Therefore, his " black-reds" themselves 

 were heterozygous. 



Matings of 427 J 1 



This animal is one of the red offspring (except for 

 partial blaze), out of 401, tricolor black ?, by 201 £ uni- 

 form red. He was extensively mated. His offspring, by 

 his sister, have been already described. 



No. 427 J 1 , mated to tricolor black, 410 ?, gave tricolor 

 black, 558, tricolor red, 593, tortoise, 557 (white foot), 

 559 (had white hind toes), 592 (nearly black). 



No. 427 £ mated to tricolor black, 522 ?, gave tortoise, 

 574, and tricolor black, 575 (not charted). 



Xo. 427 c?, mated to tricolor red, 489, gave uniform red, 

 568, tortoise, 569 (note extension of black), and tricolor 

 black, 570 (not drawn). 



No. 427 J 1 was mated to three sisters, all bicolor reds, 

 but not closely related to 427, viz., 509, 510 and 511. 

 With 509 he gave uniform red, 562, 561 (not charted) 

 and bicolor red, 562. 



With 510 he gave uniform red, 563, 565, 565 A, and bi- 

 color red, 564. 



With 511 he gave uniform red, 571, 572, and bicolor 

 red, 573. 



Evidently 427 is heterozygous for uniform and carries 

 no black. But when mated to black spotted, viz., 489, etc., 

 he gave black spotted offspring. 



No. 427 c?, mated with bicolor black, 423, gave four tor- 

 toise, 579, 580, 597 and 598. 



