150 INDEX. 

Tetanocera, 40 verticis 
Texas, 112 description and distribution, 87 
Thaumastophila, 44, 53, 133 key, 69 
Thaxter, R., 17 vestigial, 120 
theca, 26 vibrissa, 25, 26 
thoracis (Mycodrosophila), 63, 106 Villeneuve, J., 77, 91 
thorax, 27-31 Viola, 122 
tibia, 29 Virginia, 109, 112 
Titanocheta, 16, 49, 50, 108, 116, 133 virilis, 120, 121 
description and distribution, 53 chromosomes, 39 
de la Torre, C., 3, 86 courtship and mating, 7 
torrei description and distribution, 97 
description and distribution, 86 eggs, 19 
eggs, 19 key, 67 
key, 69 mutations, 14 
trachee, 20, 23 ovipositor, 32 
transversa, 80, 109, 114 puparium, 23 
courtship, 7 spermatheca, 37 
description and distribution, $1 visual stimuli, 10 
eggs, 19 vittata (Phortica), 57 
key, 67 vittata (Scaptomyza), 64, 65, 106 
spermatheca, 37 vittatifrons 
variability, 41 description and distribution, 103 
transverse suture, 28 key, 68 
Trinidad, 114 Walker, F., 65, 66, 71, 103 
tripunctata, 84 Warren, D. C., 13 
chromosomes, 39 Washington, 112 
description and distribution, 82 Wesché, 36, 37 
eggs, 19 West Virginia, 112 
key, 67 Wiedemann, 55 
spermatheca, 37 Williams, C. B., 72 
Dristany ve Bes 3,0co Williston, S. W., 51, 73, 79, 80, 87, 98, 102, 103, 
tristani 104 
description and distribution, 75 willistoni, 112, 120 
key, 70 chromosomes, 39 
trochanter, 29 courtship and mating, 7 
Trypetine, 8, 19, 22, 35, 38, 40 description and distribution, 89 
unipunctum (Scaptomyza), 109, 114 key, 67, 69 
Unwin, E. E., 19, 24, 85 mutations, 14 
Uranucha, 49, 107 spermatheca, 37 
Utah, 109 Wilson, E. B., 13 
uvarum, 89 wings, 27, 29-31 
valida, 106 Wisconsin, 112 
varia (Leucophenga ), 33, 37, 59, 106 Wollaston, 99 
distribution, 60 van der Wulp, 53 
key, 60 Wyoming, 112 
puparium, 24 yeast, 15-16 
spermatheca, 35, 36 Zaprionus, 30, 35, 50, 108, 115, 133 
variability, 41 description and distribution, 58 
venation, 29 Zeleny, C., 27 
ventral plates, 32 Zygothrica, 16, 30, 35, 44, 50, 108, 113, 115, 116, 
Vermont, 112 133 
vertical bristles, 26 description and distribution, 55 
