137G THE BUTTERFLIES OF NEW ENGLAND. 



Head ouly moderati'ly large; dorsal shield of lirst thoracic segment inconspicuous; all the tho- 

 racic legs alike in texture. 



Head subpyramidal, niuib narrower above than below Epargyreus. 



Head rounded subquadrate, as broad above as below. 



First thoracic segment with dorsal shield scarcely distinguishable from rest of seg- 

 ment Thanaos. 



First thoracic segment with dorsal shield slightly corneous Pholisora. 



Hesperia not examined. 



Table of genera, based on the mature caterpillar. 



Head at least as liigh as broad, the highest point of each lateral halt of the head inside the 

 middle line of that half; frontal triangle vertically carinate; dorsal shield of first thoracic 

 segment obvious. 

 Papillae of body inconspicuous, except from coloring. 



A distinct indurated spot at the base of the long, iufralateral hair of the second tho- 

 racic segment; a conspicuous, bright-colored, lateral stripe, the transverse markings 



in dots only Eudamus. 



No distinct infralateral, indurated spot on second thoracic segment; markings wholly 

 transverse and in broken lines, the longitudinal markings being wholly interrupted. 



Epargyreus. 

 Papillae of body conspicuous, giving it a granulated appearance. 



Collar half as broad as the head Achalarus. 



Collar distinctly less than half as broad as the head Thorybes. 



Head distinctly broader than high, the highest point of each lateral half at or outside the 

 middle of that half; frontal carina not distinctly carinate mesially; dorsal shield of first 

 thoracic segment inconspicuous or distinct only at posterior edge. 



Head distinctly angulated at the upper outer corner, as seen on a front view ; hairs of 

 head simple; dorsal shield of first thoracic segment homomorphous; no laterodorsal 



series of chitinous anuuli Thanaos. 



Head regularly rounded at upper outer corner; hairs of head branching ; dorsal shield of 

 first thoracic segment heteroraorphous, the hinder edge conspicuous; a laterodorsal 

 series of chitinous annuli. 

 None of the abdominal hairs longer than the shorter sections of the segments ; second 



pair of thoracic legs resembling the third pair more than the first Pholisora. 



Among the abdominal hairs are many, serially arranged but distant from each other, 

 much longer than the sections of the segments ; second pair of thoracic legs resemb- 

 ling the first pair rather than the third Hesperia. 



Table of genera, based on the chrysalis. 



Abdomen exclusive of cremaster no longer than the rest of the l)ody; length of mesonotum 

 equalling the width between basal wing tubercles ; cremaster comparatively stout, subtri- 

 angular. 

 Very stout bodied ; head and prothorax noticeably narrower than the thorax ; prothoracic 



spiracle witli no posterior, elevated, flaring lip Epargyreus. 



Less stout bodied ; head and prothorax scarcely narrower than the thorax; prothoracic 

 spiracle %vitha posterior, elevated, flaring lip. 

 Mandibular plate gently and uniformly convex. 



Prothoracic spiracle opening forward and outward Eudamus. 



Prothoracic spiracle opening forward only Achalarus. 



Mandibular plate with a distinct, central, hemispherical, hairy tubercle Thorybes. 



Abdomen exclusive of cremaster longer than the rest of the body ; inesonotum not so long as 

 the width between the basal wing tubercles; cremaster comparatively slight, elongated. 

 Posterior lip of prothoracic spiracle scarcely raised, not flaring; body with only very short 



and fine hairs, wholly inconsjneuous Thanaos. 



Posterior lip of prothoracic spiracle much elevated, flaring, fluted ; bodylprovidedjwith many 

 long and rather coarse hairs. 

 At base of the cremaster beneath a large, double, oval swelling enclosed anteriorly by 

 a closely fitting, rather prominent ridge; equal apical portion of cremaster viewed 



from above scarcely longer than bro.ad Pholisora. 



Base of cremaster, beneath, exceptionally uniform, with no transverse ridge; equal 

 apical portion of cremaster, viewed from above, twice as long as broad... Hesperia. 



