LEPID OP TERA . 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. 



Hydriomenid/e. 

 CC. Veins II and III of hind wings approximated or coalesced 

 for 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. 



Sterrhid^e. 

 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. 



Hydriomenid^e. 

 FF. Fore wings without an accessory cell (Alsophila). 

 p. 273. Monocteniid^e. 



Family MONOCTENIID^: (Mo-noc-te-ni'i-dae). 

 The Monocteniids {Mon-oc-te 1 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. Meyrick. 



