250 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
browns or greens changed to this color apparently regardless of 
humidity or light. Total darkness gave results in no way differ- 
ent from constant exposure to the light of a 100-watt Mazda 
lamp. Saturated humidity gave results similar to very high 
aridity. Considerable variation obtained among the individuals 
as to time of change to buff, but this was not correlated with 
light or moisture. Some changed very soon after exposure to 
high temperature while others passed through either one or two 
ecdyses. The change usually took place shortly after ecdysis, but 
occasionally occurred in the midst of an instar. A few green 
female nymphs retained their color through two molts, emerging as 
green adults. These turned buff several days after the last molt. 
Purple nymphs changed to buff after one or two molts at a 
constant temperature of 100° Fahrenheit. 
Dark brown nymphs kept at a constant temperature of 55° 
Fahrenheit retained their dark color. 
Further experiments are necessary before conclusions are 
certain, but it would seem that temperature rather than light or 
humidity is the important factor in color determination. The 
fact that different individuals respond to the same conditions in 
different ways is evidence of genetic differences in color deter- 
mination. These differences are not, however, sufficiently great 
to hold an individual constantly in the same color phase. 
It is clear then that the so-called color varieties infuscata and 
virginiana are but color phases dependent to a large extent at 
least upon environmental conditions. These different color 
phases frequently are assumed by the same individual at dif- 
ferent periods of its life. 
Geographical Distribution of New England Orthoptera. 
"Probably no state in the Union presents so striking a variety 
in its animal life as New Hampshire. Its northern and southern 
portions belong to distinct continental faunas; above the forest 
growth of its colder region rise some of the highest elevations east 
of the Rocky Mountains, and these bleak altitudes support a 
vegetation and an assemblage of animals intimately resembling 
those of Labrador and Greenland, while sixty miles to the south 
flourish animals characteristic of sub-tropical climes." 
