98 ROBERT STANLEY McEWEN 
TABLE 26 
Vermilion eyed flies 
Group A 
AVERAGE 
SsEX iV; G R 
Sex Violet Green Red 
St) nOun | OM sIEON a eIViialetecre ‘ 90 .4 72.0 59 .6 
Male..... Axel || @ || 4! 1 Female... 94.1 94.1 60.8 
[3d | 0 | 2a) 5b 
Mee @ || @ | O : 
Female..<|2d|0 |6 | 0 Male ti ses ere 
24/0 10 16 . Tied once 
Group B 
Tet e3)|'0. MOU Mate =e 60.0 97 5 90.0 
Malewee- 2d | 3a | 3b| Id} Female... 95 .0 72.0 76 .6 
3d | 0 | 3c} 5e 
AS tHlGn OO (a. Tied three 
Female..{|2d | 0 | 2 | 3 |b. Tied twice Kattied 
3d |0 | 4a| 3b} Male 4 ce. Tied twice Female eileen ae oe 
| d. Tied once \b. Tied once 
|e. Tied twice 
Groups A and B combined 
(St \59 Om) On| Males. : 95 .2 84.7 74.8 
Males.... 2d | 3a | 7b | 2d} Female... 94.5 78 .0 68 .7 
|| 3d | 0 | 5c |10e 
Ist |12 OF a0 a. Tied three 
Female..<| 2d |0 | 8 | 3 b. Tied twice fa Tied 
|| 3d | 0 | 4a | 9b] Male ;c. Tied three Female ; |~ a eae 
at aped mare \b. Tied once 
ie Tied three 
therefore, when normal eye color was thought to be the only one 
with an increased effectiveness for red, it seemed possible that 
this might be explained by assuming the red of the light to be 
exactly the same shade as that of the eye. This would then 
mean that a larger percentage of the red light entering the eye 
would be reflected and therefore effective, than would be the 
case with any other color. When it was discovered, however, 
that a still darker shade of red still further increased the effect- - 
