478 THE AMERICAN NATURALIST.  [Vor. XXXIV. 
The union of R., with 77.: in the wing is characteristic of 
the genus Dissosteira (except D. venusta Stal). M. is also 
quite variable. Its forks are always simple, but in four males 
they join R. separately (Figs. 10 a, 10 8). 
Usually, the stem of M. before it branches is rather more 
than the width of the area M.; but in five males and two 
females it is less than once as wide, in this respect resembling 
Ma 
FIG. 104. 
Fic. 11 8, 
the genus Arphia; and in seven males and five females it is 
more than twice as wide, which is the usual condition in the 
genus Hippiscus. Cz. Ist A., 2nd A.,, and 2nd A ., offer no easily 
noted variations; but the union of 2nd A., 2 with 27d A., may 
be, apparently, distant from the base as much as two-fifths, or 
as little as one-fourth, the length of the latter. When the dis- 
tance is less than two-fifths, however, a diagonal cross-vein at 
this point indicates the normal connection of the vein and its 
branch. 
