260 THE BUTTERFLIES OF THE 



100. Thecla Acadica, Edw. 



Expanse of wings 1.2 inches. 



Upper surface dark grayish brown, costal edge of both 

 wings red or reddish, the males with the usual subcostal 

 sex-mark. Hind wings with one tail, a very slight angle 

 in place of the second. The anal portion of the hind 

 wings edged with white, and before this a distinct fulvous 

 band. 



Under side gray, varying from brownish gray to gray- 

 white. At the end of each cell a short bar edged with 

 white. Beyond this a bent row of black spots surrounded 

 with white, those on the hind wings not reaching the 

 inner margin. Beyond these is a row of black crescent- 

 like spots, bordered within with white and without by 

 fulvous, the latter fading out towards the apex of the 

 fore wings ; the last and the third from the last on the 

 hind wings large, with the usual blue patch between 

 them, these two with a black outer edging. 



Of the preparatory stages of this species Mr. Win. 

 Saunders gives substantially the following. Found feed- 

 ing on willow four succeeding years. Length .63 of an 

 inch, onisciform. Head very small, pale brown and 

 shining, drawn within joint 2 when at rest. Body above 

 green, of a moderately dark shade, thickly covered with 

 very short whitish hairs, scarcely visible without a lens. 

 From joint 3 to 10 a dorsal line of darker green than 

 the ground color. Dorsal region flat; rather wide ; bor- 

 der, a raised whitish-yellow line, beginning at joint 3 and 

 fading out on joints 12 and 13. Sides of body inclined 

 at an almost acute angle and faintly striped with oblique 

 greenish-yellow lines. A whitish-yellow line borders 



