THE GENERA OF HESPERIDI. 1377 



Table of genera, based on the imago. 



Of larger size; hind wings cither tailed or (iistinotly annulate at the tip of the subniedian nor- 

 vure; first forking of median vein of liind win;; bnt little If any nearer the base than the first 

 subcostal division* ; second median nervulo of tore wing opposite the first sul)Costal fork or a 

 point between it and the second; antenna! oinb hooked, the tip generally bent backward at 

 less than a right angle ; terminal palpal joint ovate, at most hardly more than twice as long as 

 broad. 

 Hind wings with a distinct tail or projecting tooth at the tip of the submedian nervure. 



Hind wings with a long tall Eudamus. 



Hind wings with a projecting tooth only Epargyreus. 



Hind wings merely angulate at the tip of the submedian nervure. 



Hind wings produced in the submedian area, the submedian nervure being longer than 



the subcostal beyond the costal divarication Achalarus. 



Hind wings produced in the subcostal area, the subcostal beyond the costal divarication 



being longer than the submedian nervure Thorybes. 



Of smaller size ; hind wings regularly rounded next the tip of the submedian nervure ; first 

 forking of median vein of hind wing much nearer the base than the corresponding forking 

 of the subcostal ; second median nervule of fore wing opposite the second or third subcostal 

 fork ; antenual club sickle-shaped, the tip generally bent backward at more than a right angle ; 

 terminal palpal joint linear, four or more times as long as broad. 

 Anteunal club generally terminating in a fine, long drawn point; if nott, the antennae half 

 as long as the fore wing; opposite clasps of male abdominal appendages asymmetrical... 



Thanaos. 

 Antennal club but slightly tapering on apical half, the tip bluntly pointed, the whole an- 

 tenna less than half as long as the wing; opposite clasps of male abdominal appendages 

 symmetrical. 

 Almost wholly black, at most with a few white dots on the fore wings, the fringe uni- 

 colorous; antennalclubsixor seven times as long as broad, tapering very regularly and 

 gradually from the middle in either direction ; at a distance from the tip equal to 

 half the extreme breadth, much less than half as broad as at greatest. . . .Pholisora. 

 Much checkered with white on both wings, the fringe with alternating colors ; antennal 

 club not more than four or five times longer than broad, tapering much more rapidly 

 next the tip than before ; at a distance from the tip equal to half the extreme breadth, 

 fully half, sometimes more than three-quarters, as broad as at greatest... Hesperia. 



SECTION I. 



Egg with vertical ribs of nearly equal height throughout, the cross lines exceed- 

 ingly frequent, making very elongated cells. Caterpillar at birth with the thoracic dorsal 

 shield usually conspicuous. Mature caterpillar with the head at least as high as broad ; 

 frontal triangle mesially carinate ; dorsal thoracic shield obvious. Chrysalis. Meso- 

 notum as long as its greatest width ; cremaster stout, subtriaugular. Imago. Species 

 of larger size ; hind wings either tailed or distinctly angulate next anal angle ; sub- 

 costal and median veins of hind wings forking for the first time at about equal distances 

 from the base; club of antennae hooked; last palpal joint ovate, at most hardly more 

 than twice as long as broad. Wings held erect in repose by day. 



Gexera : Eudamus, Epargyreus, Achalarus. Thorybes. 

 • Not including the costo-subcostal divarication, t As in Thanaos brizo. 



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