472 THE AMERICAN NATURALIST. [Vor. XXXIV. 
but because I had a larger number of specimens (fifty-seven) of 
this than of any other species, and these were all collected dur- 
ing the same season in four or five counties of northwest Arkan- 
sas, except three, which came from Union County, Illinois. At 
the same time it is well to note that it is more variable in color 
than any other species known to me. It frequents stony sur- 
faces exclusively, and its colors vary with the colors of the 
stones. On black rocks it is nearly black in color, while on 
eg v9 WS OM, My RY Agu Ag 
or e Ei ! 
I 
; i , ris 
ddA And.A AtA Ob Ci Cy Cut 
Fic. x. 
m A2 “Ay UndA : 
F1G. 2. 
C., costa; Sc., subcosta; R., radius ;. 2.1, first fork of radius; R.s, radial sector; R.s 7, 2, etc., 
1, first c second M = - — P. 3 
; Cu. 
ubi ected rae of cubitus; Cw.1 7, 2, pe ta ani 
second forks of C.;; Cug, 1, first fork of C.,; Tst A., first anal ve yi 2nd A., second anal 
vein; 24d A t fork of 2nd 4.; 2nd A.s, sector of 2nd A.; 2nd A.s 1, 2, first an nd 
AER forks a the sector * the ecu anal vein; 3rd A., third d vein ; ard A., 1-8, 
accessory branches of 3rd 
The tegmina and wings are divided by the Ae veins and their branches into areas which 
take the name of the vein or branch immediately anterior. 
hillsides covered with black and white lichen-covered fragments 
of chert it is colored black, white, and green, so that away from 
its environment it is a very conspicuously colored insect. It 
will require, however, more extended observations than I have 
been able to make to know whether or not there is any relation 
between variation in coloration and venation. 
