KEY TO THE GROUPS-BUTTERFLY. 43 



than 2'; club of antennae abruptly- 

 bent in the mirldle. 

 d^ Hind wings Avith a distinct tail or tooth at ti^o of 



vein 4 49. Epargyreus. 



d'. Hind wings merely broadly angulate at tip of 



vein 4 50. Tlioryhes. 



c\ Hind wings regularly rounded at tij) of vein 4 as 



elsewhere; vein 3' arising much 



nearer the base of the wing than 2'; 



club of antennae curved throughout. 



d\ Club of antennae generally ending in a long-drawn 



point; if not, the antennae half as 



long as the fore wing. .51. Tlianaos. 



d'. Club of antennae tapering but little on apical 



half, the tip bluntly pointed, the 

 whole antenna less than half as long 

 as the fore wing, 

 e'. Club of antennae six or seven times as long as 

 broad, tapering from the middle 

 equally in both directions. 



52. PlioUsora, 



e^ Club of antennae not more than four or five 



times as long as broad, tapering more 



rapidly from the middle toward the 



tip than in the opposite direction. 



53. Ilesperia. 

 B^ Recurved part of antennal club brief as compared 



with the thicker part, occasionally 

 absent ; abdomen reaching to or be- 

 yond the outer margin of the hind 



Aving (Tribe Smaller Ski^jpers.) 



c'. Club of antennae with no apical hook. 



54. Ancyloxipha. 

 c^ Club of antennae with a distinct, though some- 

 times slight, apical hook. 



