No. 402.] THE VENATION OF TRIMEROTROPIS. 477 
. Ist A. and 2nd A. are simple veins, whose variations are not 
easily noted; but 377 A., while usually simple and free to the 
posterior margin or with its apex lost among the numerous 
cross-veins of the anal area, is definitely connected apically 
. with 2z4 A. in four males and two females. In all cases except 
one this fusion is common to the two tegmina. This is the 
rule in Chortophaga. | 
In the Wing. 
As in the tegmina, C. and Sc. are simple and vary little; the 
former occupies the costal margin ; the latter is approximate to, 
or fused with, C. on the distal one-half or one-third of the 
wing; R.ı remains simple. KR., varies greatly, while it gener- 
ally has one branch; in five males and one female it has none, 
FiG. 9 a. 
and this is the usual condition in. Encoptotaphus, Chortophaga, 
and Derotmema. This branch of R., varies from less than one- 
fourth the length of R., in two males and one female to more 
than one-half in five males and four females; when normally 
developed it is about one-third. œ. fork should be halfway 
R 
Fic. 94. 
from the union of M. and R. to the tip of the wing. In 
numerous specimens it is a little more, and in two males and 
two females less, than one-third of the way. In two males R.s 
has no branch and is connected with M., instead of R., (Figs. 
9 a, 9 5). 
