480 A NEW DOMINANT COLOR PATTERN 
This matter of isolation is very easily managed in the laboratory, but 
the situation is quite different in the wild state. However, grouse lo- 
custs have been recorded as having traveled many miles by flight sup- 
plemented by storm (Hancock ’02). It is also known that their habi- 
tats are rather narrowly limited. Once favorable, thickly inhabited 
margins of ponds and streams have been completely spoiled and depo- 
pulated, by (1) oil, (2) salinity, and more frequently by (3) drouth. The- 
se areas, especially those spoiled by drouth, practically always come 
back. Under such circumstances, it is not difficult to conceive of a fe- 
male homozygous for a few, or several, factors for elementary patterns 
and fertilized by a similar male, partly flying and partly driven by 
storm arriving at an adequately fit habitat which had been freed from 
her kind by some cause, perhaps, one of those mentioned. Since some 
of these which are most likely to become homozygous for factors by lin- 
kage, A. eurycephalus, are also gynogenetically, with rare exceptions, 
parthenogenetic, at least half the difficulty of such isolation, namely, 
the necessity of fertilization by a male of similar characteristics, would 
be obviated. 
It would then only be necessary for the original habitats to become, 
as often happens, untenable for that particular species, and later beco- 
me habitable again, for the new homozygous complex, itself a new nor- 
mal or wild type, with its mutants, which do rarely occur, to be redis- 
tributed as a new and different kind. 
„ What is suggested here deals only with color patterns which have 
not yet been critically experimentally determined to be of evolutionary 
importance. The production of new true breeding color patterns cer- 
tainly falls far short of breaking through the barrier set up by the Lin- 
neon (Lotsy '16), and only by analogy can these facts be applied to the 
factors of evolution. 
LITERATURE CITED 
BELLAMY, A. W., 1917. Multiple Allelomorphism and Inheritance of Color Pat- 
terns in Tettigidea. Jour. of Genetics, Vol. VII, No. 1. 
Hancock, J. L. 1902. Tettigidae of North America. Chicago 1902. 
Lotsy, J. P., 1916. Evolution by Means of Hybridization. The Hague. 
: NABOURS, R. K., 1917. Studies of Inheritance and Evolution in Orthopetera IT 
and III. Jour. of Genetics, Vol. VII, No. 1. 
NABOURS, KR. K., 1919. Parthenogenesis and Crossing over in the Grouse Locust 
Apotettix. Am. Nat. Vol. LIII, Mch., 1919. 
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