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- 

 Fi 131 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 ; antennae and legs ringed with black and white ; 

 body slender, longer than the hind wings, which are hori- 

 zontal in repose, and the fore wings raised and spread a 

 little. 



Expands about i 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 antennas, 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 antennas 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. 



