{March & Afril 1885. BULLETIN BROOKLYN ENTOM. SOC. VOL. VII. 147 
sexes. . Really the (j' has the fore tarsus formed of but a single joint in 
the cases examined by me, though that joint is clothed and ringed so 
as to appear upon superficial examination to be normally divided. The 
common Chrys. americana well illustrates this. 
Though the species are numerous the genera are few in number. 
Thecla is distinguished by the usually prominent shoulder of fore- 
wings and somewhat elongate secondaries: the latter are usually furnished 
with filiform tails, or are notched or dentate. 
Fenesica is without tails, fulvous in color with rather wide black 
margin to primaries, 
Lycaena and Chrysophanus differ little in structure and are by many 
regarded as identical. In the latter genus the eyes are hairy, the spinu- 
lation of tarsi strong, the colors usually coppery in at least one sex, and 
maculation consisting of black spots. 
Lycaena has naked eyes, more feebly spined tarsi and the color is 
blue, in at least one sex. 
The Papilionidae are, comparatively spedking, poorly represented in 
our country. The brilliant Jorphos and Ornithopteras are entirely 
wanting and but a very limited number of what may be considered the 
more typical group of Papo are found north of Mexico. 
Two sub-families are represented —Pver7m.2e and Papilioninae. 
The Prerimae are medium or small sized insects, white, yellow or 
orange in color; the secondaries grooved for the reception of the ab- 
domen, six complete legs, the anterior tibia w.thout epiphysis. 
Preris is white, or pale yellowish, often mottled with black; moder- 
ate in size, the antennze abruptly terminating in an avoid club, 
Nathalis is a small form, yellow in color; the primaries considerably 
enlarged outwardly, the secondaries proportionately rather small. The 
anterior margin of secondaries in ({\ with an oval glandular naked im- 
pression. 
Anthocharis has rather short antenne and proportionate wings. The 
underside of secondaries is motiled with greenish-gray and the primaries 
have often a large orange apical patch. The general color is whitish or 
greenish pale yellow. 
Calhidryas contains-large insects usually yellow in color, the inner 
margin of primaries sinuate, the secondaries beneath with silvered spots. 
The antennal club is very gradual-and the antennz themse'ves, short. 
Kricogonia \acks the silver spots beneath, and the antennal club is 
truncate. 
