14 ENTOMOLOGICAL NEWS [JAN., '29
Hancock's Studies of Inheritance in Green and Pink
Katy-Dids, Amblycorypha oblongifolia DeUeer
Bv ROBERT K. NABOURS
Kansas State Agricultural College and Agricultural Experiment
Station, Manhattan, Kansas.
In the ENTOMOLOGICAL NEWS, Vol. xxvii, pp. 70-82, the late
Dr. Joseph Lane Hancock, of Chicago, gave a preliminary
account of his extraordinary experiment in crossing a male
green Katy-did with a pink female of the species Amblycorypha
oblongifolia. There is an historical sketch, an account of the
finding of the pink female and a description, in considerable
detail, of the methods of breeding and the general biology of
these Katy-dids. Then there is a summary, in part as follows :
1. A green male was mated to the pink Katy-did, and the
eggs were oviposited in the summer of 1912. Hancock was
the first to observe that the females of this species oviposited
in the ground. He was also first to discover that some of the
eggs required two, and others three years before hatching.
2. There were thirteen F progeny, eight pink and two
green hatched two years (1914), and one pink and two green
hatched three years (1915) after the eggs had been oviposited,
a ratio of 9 pink : 4 green. There were approximately as many
males as females.
3. In June, 1914, four pairs of the F x pink, and one pair
of the green Katy-dids were mated. Three of the pink and the
one green female oviposited in the ground of their respective
cages late in the summer and early autumn.
4. In the summer of 1915, a green female, of the one pink
and two green individuals which hatched that year from the
1912 mating, was mated to a green male from the field. Later
in the summer she oviposited.
5. Hancock concluded that the pink color, as well as the
green, was hereditary, and that the idea of these colors in
Katy-dids being dependent on the absorption of the coloring
matter taken in with the food was erroneous.
At the time of the publication of this paper, February, 1916,
Hancock was looking forward to the hatching of the F.. progeny
in the summers of 1916, 1917 and 1918.