480 THE AMERICAN NATURALIST.  [Vor. XXXIV. 
noticed, one or more times, in other species of the genus. In. 
Tr. lanta the’ second and third branches of R., have a common 
stem (Figs. 11 a, 11 3). 
In Tr. azurescens, M., may fork (Figs. 12 a, 12 6). 
Mai 
Lst. A 
* Fic. "4 o. 
In Tr. albolineata, Cur: loses its connection with Cz.2 and 
becomes attached to M., (Figs. 13 a, 13 å). 
Unless the tegmina figured by Saussure! is abnormal, this is 
the usual condition in the genus Scintharista. In the species 
Tr. vinculata, Cu., may be branched (Figs. 14 a, 14 8). 
GENERAL CONCLUSIONS. 
I. Variations in venation which occur within a single species 
are much greater than those differences which distinguish one 
genus from another. That is to say that many of the variations 
which occur are not restricted to what are commonly consid- 
ered specific limits, but are such as are paralleled only in widely 
separated genera of the subfamily, and some of them do not 
normally occur within the limits of the subfamily. 
2. Variations in venation which occur in the various species 
1 Saussure, H. de. Prodromus Edipodionum, Pl., Fig. to. Geneva, 1884. 
