456 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Color: the female is usually grass-green above and on the sides 
of the head, pronotum, hind femora, and costal half of tegmina ; 
the posterior (dorsal) half of the tegmina brown or gray. Some, 
however, are wholly brown of various shades ranging from pale 
yellowish almost to vandyke. The male is usually brown, but 
occasionally presents the green coloration of the female. Brown 
individuals taken early in the season are grayer in tone than those 
taken later, the brown deepening and becoming more yellowish 
with age. Rarely, the green is wholly or largely replaced on the 
head, pronotum, and hind femora by pink or reddish purple. The 
hind tibiae differ much in color, being variously tinted with 
brown, blue, pink, or purple, without regard to sex, often with a 
pale ring below the knees. 
Measurements. 
Total Body Tegmina Hind femora Antenna 
Male 21.5-26 17-20 16.8-20 10.5-12.5 6-8 
Female 26 -33 22-32 18 .6-25 13 -15 .5 6-8 mm. 
Owing to its retreating face, this Locust is not infrequently 
mistaken for an Acridine (TryxaKne) by the inexperienced, a fact 
not to be wondered at when it is considered that for a long time it 
was assigned to that subfamily by systematists, and especially 
when this character is considered in conjunction with its colora- 
tion, dichromatism, and preference for a relatively moist and 
verdurous environment. 
It is our only species of the subfamily that is markedly dichro- 
matic, presenting two distinct types of coloration: one entirely 
brown, the other largely green but with a small amount of brown 
on the tegmina. These two forms have been distinguished by 
the names virginiana for the green and infuscata for the brown, 
appUed to them by Fabricius and Harris respectively, but they 
have no systematic significance and may be ignored. Specimens 
are occasionally found which can scarcely be referred properly 
to either form, the color being a mixture. 
This dichromatism is largely characteristic of sex, most of the 
females being green, most of the males brown. Thus of three 
hundred specimens collected by the writer only 18 per cent of 
females were brown, of males 10 per cent were green. These 
