LEPIDOPTERA. 
273 
C. Veins II and III of hind wings extending distinctly separate 
from each other, except that they are connected by a cross 
vein near the middle of the discal cell (Fig. 335). p. 282. 
HYDRIOMENIDiE. 
CC. Veins II and III of hind wings approximated or coalesced 
lor a greater or less distance. 
D. Veins II and III of the hind wings closely approximated 
but not coalesced along the second fourth (more or less) of 
the discal cell. 
E. Veins III and Vi of hind wings separating at or before the 
apex of the discal cell (Fig. 327). p. 277. Ennomid^e. 
EE. Veins III and Vi of hind wings coalesced for a consider¬ 
able distance beyond the apex of the discal cell (Fig. 324). 
p. 273. Monocteniid^e. 
DD. Veins II and III of hind wings coalesced for a greater or 
less distance. 
E. Veins II and III of the hind wings coalesced for a short 
distance near the beginning of the second fourth of the 
discal cell, thence rapidly diverging (Fig. 341). p. 286. 
STERRHIDiE. 
EE. Veins II and III of the hind wings coalesced to or be¬ 
yond the middle of the discal cell (Fig. 334). 
F. Fore wings with one or two accessory cells, p. 282. 
HYDRIOMENIDiE. 
FF. Fore wings without an accessory cell ( Alsophila ). 
p. 273. MONOCTENIIDiE. 
Family MONOCTENIID^E (Mo-noc-te-ni'i-dae). 
The Monocteniids (Mon-oc-te'ni-ids). 
This family includes only a small number of North 
American species; but among them are those that are the 
most important to us from an economic standpoint of all the 
Geometrids. 
The family is also of especial interest from a scientific 
point of view; for to it belong the most primitive forms of 
the Geometrina, certain genera, found in Australia, being 
closely allied to the Notodontidae, according to the observa¬ 
tions of Mr. Me}'rick. 
19 
