1932 ] 
Papilio glaucus turnus 
35 
A FEMALE INTERMEDIATE BETWEEN PAPILIO 
GLAUCUS AND ITS FORM TURNUS 
(LEPID.: PAPILIONID^E) 
By Harold O’Byrne 
Webster Groves, Missouri 
It is well known that there are two forms of female in 
Papilio glaucus Linn., the black type form and the yellow 
form turnus Linn., and that they are not only sexual forms, 
but geographical as well. In the southern part of the range 
of this species, black females are the rule, while in the 
north, only yellow ones occur ; in a considerable region near 
the middle of its territory, both forms fly together. Mis- 
souri is in that intermediate region, though collectors in 
the neighborhood of St. Louis consider the yellow form 
somewhat scarce. The males are invariably yellow, and a 
few closely related species that inhabit the southwestern 
part of the country and northern Mexico are never black 
in either sex. To the knowledge of the writer, no breeding 
has been done in this species with a view toward working 
out the relations of these forms in the light of genetics. 
The fact that this condition is linked with sex, and that 
according to Jordan 1 there is a rarity of intermediate 
forms, indicates that this is a Mendelian phenomenon. 
Knowing of the rarity of intermediate forms, I was sur- 
prised to take at Allenton, Missouri, on August 9, 1931, 
such a female, having the black color of glaucus, but heav- 
ily suffused with yellow on the upper and lower surfaces 
of both pairs of wings. This has the effect of making the 
black stripes very noticeable on the upper side, and in this 
respect the specimen differs markedly from glaucus. This 
specimen is in no wise comparable to one mentioned by 
1 In Seitz, The Macrolepidoptera of the World. 
