The Classification of Moths 
volume of his “Catalogue of the Lepidoptera Phalsense,” and in 
the preparation of which he has been assisted by Dr. Dyar. 
KEY TO THE FAMILIES OF NORTH AMERICAN 
HETEROCERA. 
Antennae not clubbed or dilated, or frenulum present when clubbed 
or dilated. Frenulum present when not otherwise indicated. . i 
1— Hind wing with cell emitting not more than six veins; wings unlike 
in shape.2 
Hind wing with cell emitting more than six veins; wings similar in 
shape . 44 
2— Hind wing with vein 1 c absent.3 
Hind wing with vein 1 c present.22 
3— Fore wing with vein 5 nearer 4 than 6.4 
Fore wing with vein 5 from middle of discocellulars or nearer 6 
than 4 . . . „ ..15 
4— Hind wing with vein 8 absent.Fam. 4, Syntomidce. 
Hind wing with vein 8 present.5 
5— Hind wing with vein 8 remote from 7.6 
Hind wing with vein 8 touching or approximate to 7 beyond cell ...12 
6— Hind wing with vein 8 anastomosing with cell to near or beyond 
middle . .. . „.7 
Hind, wing with vein 8 anastomosing with cell near base only.9 
Hind wing with vein 8 joined to cell by a bar. .Fam. 14, Liparidce. 
7— Ocelli present.Fam. 6, Arctiidoe. 
Ocelli absent. 8 
8— Fore wing with tufts of raised scales in the cell. .Fam. 20, Nolida. 
Fore wing without cuch tufts.Fam. 5, LithosiidcB. 
9— Antennae with shaft more or less dilated toward tip. 
...Fam. 7, Agaristidce. 
Antennae with shaft not dilated.10 
10— Hind wing with veins 3 and 4 stalked.Fam. 10, Pericopida. 
Hind wing with veins 3 and 4 not stalked.11 
11— Fore wing with costa and inner margin parallel, arched at base .... 
.Fam. 9, Nycteolida. 
Fore wing trigonate...Fam. 8, NoctuvdcB. 
ia—Hind wing with vein 1 a absent or not reaching anal angle. 
..Fam. 17, Platypterygida. 
Hind wing with vein 10 reaching anal angle.13 
13— Frenulum present.Fam. 28, Thyrididce. 
Frenulum absent.. Fam. 15, LasiocampidcB. 
14— Hind wing with vein 8 diverging from cell from base..15 
Hind wing with vein 8 connected or approximate to cell.17 
13—Tongue absent; no tibial spurs; frenulum absent. . Fam. 2, SaturniidcB. 
Tongue and tibial spurs present; frenulum absent. 
.Fam. 3, Ceratocampidce. 
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