AMERICAN LEPIDOPTERA. 249 



though in this opinion I have the sympathy of veiy few, if, indeed, 

 of any other Lepidopterists. 



GEOMETRINA. 



Synopsis of families and subfamilies. 



Hind wings vein 5 present, strong GEOMETRID^E. 



Hind wings vein absent, or a fold only ENNOMID^E. 



GEOMETRID^E. 



1. All wings with vein 5 nearer 6 than 4 Geomltrin.e. 



Fore or hind wings with vein 5 at middle of cell, or nearer 4 than 6 2. 



2. Hind wings vein 8 coalescing with cell to middle, or if separate, joined with 



it by a cross-bar at or beyond middle 3. 



Hind wings vein 8 separate from cell or joined at or near base only 4. 



3. Frenulnm present H ydriomin^. 



Frenulum absent. DYSPTEKiDiNiE. 



4. Hind wings 8 shortly joined with cell at or near base 5. 



Hind wings 8 separate from cell 6. 



5. Hind wings joined with cell near base, shortly, then rapidly diverging. 



Sterrhin^. 

 Hind wings 8 joined with cell at base, then subparallel with it. 



MONOC'TENIIN.E. 



6. Fore wings 7 separate from both 8 and 9 7. 



Fore wings 7 stemmed with 8 and 9 Brephin.e. 



7. Fore wings 8 stemmed with 9 Strophidiin^. 



Fore wings 9 separate from 8 Leuculin^. 



ENNOMID^. 



1. Hind wings 8 coalescing with cell at base FernaldelliNjE. 



Hind wings 8 separate from cell 2. 



2. Frenulum present 3. 



Frenulum absent Palyadin.*;. 



3. Antennae and legs very long; antennse three-fourths length of fore wings. 



MeCOCER ATIN X.. 



Antennifi and legs normal; antennae never more than two-thirds length of 

 fore wings 4. 



4. Fore wings 7 separate from 8 and 9 Melanchroiin.e. 



•Fore wings 7 stemmed with 8 and 9 Ennomix.e. 



Dyspteridin^e. 

 The Dyspteridinse, with the Hydriomin!?e, are easily separated from 

 the rest of the Geometrina by the coalescing of vein 8 of the hind 

 wings with the cell for half or more of its length, or in exceptional 

 cases in both subfamilies, where 8 does not coalesce with the cell, it 

 is joined by a cross-vein to the cell at or beyond its middle. In 

 both subfamilies vein 5 of the hind wings is developed. The two 



TKANS. AM. KNT. SOC. XXIII. (32) JULY, 1896 



