874 THE BUTTERFLIES OF NEW ENGLAND. 



Feniseca) also present another curious feature in a tumid swelling of the 

 basal joint of the middle and hind tarsi. Finally, the fore legs of the 

 males of Nviii])halidae are frequently furnished with a sjtreading brush of 

 hairs : or, in other butterflies, the thighs and shanks of the middle and hind 

 legs are supplied with curious pencils or fringes of stiff hair, which appear 

 to have the same significance as similar adornments in higher animals. 



There are still further ways in which this form of antigeny could be 

 illustrated from the members of the lowest family, but these are so interest- 

 ing from several points of view, and so universal in the family that we 

 will reserve them for separate treatment. 



*»* For references, see the bibliography on p. 535, at the end of Excursus XVI. 



Table of the species of Thecla, based on the egg. 



Erect filaments at cell angles very long ami slender, tapering to a point liparops. 



Erect filaments comparatively short, thick and blunt. 

 Filaments apically truncate. 



Filaments closely crowded, stout, as broad as heiglit above cell walls calanus. 



Filaments rather distant, slender, higher tlian broad, sometimes twice as high as 



broad acadica. 



Filaments apically rounded edwardsii. 



(Ontario unknown). 



Material is not at hand for a satisfactory table based on the caterpillar at birth. 

 Table of species, based on the mature caterpillar. 



Head black edwardsii. 



Head green or pale greenish brown. 



Head with a transverse Ijlack belt across whole lower part of face liparops. 



Head at most only infuscated below or with a black stripe confined to the base of the 

 frontal triangle. 

 Body nearly equal, tapering only on the last three or four segments, so that the 



hinder end is moderately broad calanus. 



Body tapering considerably from in front of the middle backward, so that the 



hinder end is very slender acadica. 



(Ontario unknown). 



Table of species, based on the chrysalis. 



Body covered with h.airs half as long as one of the abdominal segments liparops. 



Hairs of body hardly if any more than one-fourth as long as one of the abdominal segments. 

 Tracery of raised lines on body no higher at the intersection of the cells than elsewhere. . . . 



calanus. 

 Tracery of raised lines with distinct though minute wart-like elevations at the intersection 

 of the cells. 



Cells of tracery small; hairs very short, their spicules obscure ed'wardsii. 



Cells of tracery large ; hairs moderately long, their spicules distinct acadica. 



(Ontario unknown.) 



