MORSE: ORTHOPTERA OF NEW ENGLAND. 249 
Melanoplus m. atlanis and M . fetnur-rubrum is occasionally rose 
red. Scarcely a species can be named that does not present 
notable color variations, sufficient to make color in itself often 
of but inconsequential value in characterizing species, yet in 
other cases it may i)e extremely useful. The pattern of colora- 
tion due to markings, however, is often of great service; but 
structure is the only safe guide in discriminating species. 
Color Determination i.\ the Green-striped Locust, 
Chortophaga viridifasciata. 
Bv Dr. Phineas W. Whiting. 
Two color phases of Chortophaga viridifasciata are generally 
recognized, — a green and a brown. The greens are called 
variety inrginiana and the browns, infuscata. Intermediates 
occur but are relatively scarce. The greens grade into purple 
and rarely purple marks occur on brown individuals. The 
browns vary from very dark brown to buff. IMales are usually 
brown but occasionally a green male may be taken. Among the 
females browns and greens occur in variable percentages. 
It was at first thought that these color differences might be due 
to mendelizing factors correlated in some way with sex. Accord- 
ingly matings were made at the Bussey Institution during the 
summer of 1913. Green was mated to green, brown to brown, 
brown male to green female, and green male to brown female. 
Without exception the nymphs produced were brown and re- 
mained brown throughout life. Green nymphs were taken in the 
field and reared in the insectary. They became Vjrown after 
ecdysis. Conditions were hot and dry. Other nymphs were 
taken and kept in cooler, damper places. The greens under 
these conditions usually remained green, only occasionally turn- 
ing brown. The brown, with the exception of two doubtful cases, 
remained brown. 
At the Zoological Laboratory of the University of Pennsyl- 
vania experiments were performed during the spring of 1915 
under more carefully controlled conditions. At a constant tem- 
perature of 100° Fahrenheit it was found that both nymphs and 
adults of Chortophaga bleached out to a light buff color. Dark 
