308 
LEPIDOPTERA. 
leaves, which are connected together by a loose internal 
web of threads, forming a kind of imperfect cocoon. 
Heteropterus marginatus. Bordered Skipper. (Fig. 131.) 
Fore wings tawny yellow above, shaded with brown be¬ 
hind, and with an indistinct brownish 
streak in the middle ; beneath, brown, 
with the front and hind margin broadly 
bordered with tawny yellow; hind wings 
tawny yellow, with a broad brownish 
outer margin above, and without a bor¬ 
der beneath ; antennas and legs ringed with black and white ; 
body slender, longer than the hind wings, Avhich are hori¬ 
zontal in repose, and the fore wings raised and spread a 
little. 
Expands about J of an inch. 
This pretty species does not appear to have been described 
before. The chrysalis from which it was obtained, on the 
20th of July, is rather long, nearly cylindrical, but tapering 
at the hinder extremity, and with an obtusely rounded head. 
It is reddish ash-colored, minutely sprinkled with brown 
dots. I am not sure that this skipper belongs to the genus 
Heteropterus^ but have placed it in this genus on account 
of the antennae, which are not hooked at the end, but ter¬ 
minate much like those of the genus Polyommatus. 
In the greater number of our skippers the antennae are 
curved or hooked at the end. This is the case in the kinds 
belonging to the genus Thanaos^ which have the knobs of 
the antennae long, tapering, and curved, the body thick, and 
shorter than the wings ; the latter are generally spread in 
repose, and the fringes are of one uniform color, or not 
spotted. The males are distinguished by having the middle 
of the front edge of the fore wings doubled back on the 
upper surface. 
