80 



Tabulation of Data. 



Exp. 15. — Triangle droop. 



Mating: triangle X droop. 

 3 cultures (M 43, 45, 63). 



Non-cross-overs (T 68; d 55) 123 



Cross-overs (T d 17; M- 51) 68 



Total 191 



Per cent cross-overs, T-d 23.6, counting 

 only d flies. 



Exp. 16. — Short rugose. 



Mating: short X rugose. 



7 cultures (P 533-4, 539, 555-8). 



Non-cross-overs (s 327; r 270) 597 



Cross-overs (s r 57; -f- 76) 133 



Total 730 



Per cent cross-overs, s-r 18.2. 



Exp. 17. — Short droop. 



Mating: short X droop. 

 3 cultures (M 38, 96, 100). 



Non-cross-overs (s 93; d 48) 141 



Cross-overs (s d 8 ; -|- 47) 55 



Total 196 



Per cent cross-overs, s-d 28.0; counting 

 only d flies, 14.3. 



Exp. 18. — Rugose droop. 



Mating: rugose X droop. 



8 cultures (E 1260-2, 1307-8, 1349-51). 



Non-cross-overs (d 283; r 314) 597 



Cross-overs (d r 23 ; -f 68) 91 



Total 688 



Per cent cross-overs, r— d, counting only 

 d. 7.5. 



Exp. 19. — Sepia yellow crossveinless. 

 Mating: sepia X yellow crossveinless. 

 7 cultures (L 492, 495-6, E 528-9, 547-8). 



Non-cross-overs (se 204; y c 206) 410 



Co. region 1 (se y c 8; -H 16) 24 



Co. region 2 (se c 53 ; y 54) 107 



Co. region 1-2 (se y 2 ; c 5) 7 



Total 548 



Per cent cross-overs, se-y 5.6; y— c 20.8. 



Exp. 20. — Yellow crossveinless vermilion. 



Mating: yellow crossveinless X vermilion. 

 3 cultures (E 409, 744, 746). 



Non-cross-overs (y c 177; v 197) 374 



Co. region 1 (y v 59; c 37) 96 



Co. region 2 (y c v 1 ; -f 1) 2 



Total 472 



Per cent cross-overs, y— c 20.3, c-v 0.4. 



Exp. 21. — Yellow crossveinless singed. 

 Mating: yellow crossveinless X singed. 

 5 cultures (P 498, 508-11). 



Non-cross-overs (y c 148; si 135) 283 



Co. region 1 (y si 28; c 36) 64 



Co. region 2 (y c ei 23 ; 4- 40) 63 



Co. region 1-2 (y 5; c si 2) 7 



Total 417 



Per cent cross-overs, y— c 17.0; o-si 16.8. 



Exp. 22. — Yellow crossveinless short. 



Mating: yellow crossveinless X short. 

 1 culture (P 567). 



Non-cross-overs (y c 34; s 27) 61 



Co. region 1 (y s 7 ; c 8) 15 



Co. region 2 (y c s 26; -|- 26) 52 



Co. region 1-2 (y 4; c s 5) 9 



Total 137 



Per cent cross-overs, y— c 17.5; c-s 44.5. 



Exp. 23. — Yellow crossveinless droop. 



Mating: yellow crossveinless X droop. 

 1 culture (E 1314). 



Non-cross-overs (y c 28; d 15) 43 



Co. region 1 (y d 1 ; c 4) 5 



Co. region 2 (y c d 5; + 15) 20 



Co. regioa 1-2 (y 10; c d 1) 11 



Total 79 



Per cent cross-overs, y— c 20.2; c-d 39.2. 



Exp. 24. — Yellow vermilion short. 



Mating: yellow short X vermilion. 

 4 cultures (P 707-8, 710, 712). 



Non-cross-overs (y s 56; v 65) 121 



Co. region 1 (y v 9; s 11) 20 



Co. region 2 (y 43 ; v s 29) 72 



Co. region 1-2 (y v s 5; -[- 7) 12 



Total 225 



Per cent cross-overs, y-v 14.2; v-s 37.3. 



Exp. 25. — Yellow singed short. 



Mating: yellow singed X short. 

 4 cultures (P 649, 674-5, 677). 



Non-cross-overs (y s 34 ; si 40) 74 



Co. region 1 (y si 17; s 24) 41 



Co. region 2 (y 19; si s 21) 40 



Co. region 1-2 (y si s 9 ; 4- 9) 18 



Total 173 



Per cent cross-overs, y-si 34.1; si— 3 33.5. 



Exp. 26. — Yellow hairy magenta. 



Mating: yellow hairy X magenta. 



1 culture (V 866). 



Non-cross-overs (y ha 16; m 19) 36 



Co. region 1 (y m 16; ha 9) 26 



Co. region 2 (y ha m 1 ; -f l) 2 



Co. region 1-2 (y ; ha m 1) 1 



Total 63 



Per cent cross-overs, y-ha 41.3; ha-m 4.8. 



Exp. 27. — Vermilion magenta forked. 



Mating: vermilion X magenta forked. 



2 cultures (E 475-6). 



Non-cross-overs (v 59; m f 48) 107 



Co. region 1 (v m f 24; -|- 28) 62 



Co. region 2 (v f 3; m 3) 6 



Total 165 



Per cent cross-overe, v-m 31.5; m-f 3.6. 



