BUTTERFLIES OF THE DISTRICT OF COLUMBIA 201 



tered, or may form a narrow interrupted band running 



from the middle of the costal border toward the inner 



angle. 



e*. Fore wings crossed by a conspicuous narrow interrupted 



band of white or silvery spots running from the 



middle of the costal margin to near the inner angle 



(pi. 31, figs. 2, 3) Thorybes daunus (p. 205). 



e^ Spots on the fore wings dull, small. Inconspicuous, and 

 widely separated, not forming a band across the 



wings (pi. 31, fig. 4) Thorybes pylades (p. 204). 



<f. Fore wings above mottled. 



e*. Fore wings with no subapical glassy spots. 

 f. Smaller, the fore wings rarely more than 17 mm. in 

 length ; a distinct hoary patch between the upper 

 halves of the two bands crossing the upper surface 

 of the fore wings ; male with a long pencil of 

 hairs on the hind tibiae ; costal fold of males with 

 flagellate tapering scales (pi. 52, figs. 4-6). 



Thanaos icelus (p. 210). 

 f. Larger, the fore wings rarely less than 17 mm. in 

 length ; no distinct hoary patch between the upper 

 halves of the two bands crossing the upper surface 

 of the fore wings ; males without a pencil of hairs 

 on the hind tibiae; costal fold of males with 

 twisted ribbonlike scales (pi. 52, figs. 1, 2). 



Thanaos brizo (p. 211). 

 e^ Fore wings with subapical glassy spots. 



f. Size smaller; fore wings rarely more than 17 mm. 

 long ; costal fold of males with many rodlike sub- 

 equal androconia, sometimes 2-pronged, apically 

 not twice as stout as basally. 

 g^. Dark spots on the upper surface of the wings well 

 defined and in striking contrast to the ground 

 color ; costal fold of males with many " apple 

 seed" androconia (pi. 52, figs. 10-12). 



Thanaos martialis (p. 212), 

 fir*. Dark spots on the upper surface of the wings ill 

 defined and not in striking contrast to the 

 ground color; costal fold of males without 

 "apple seed" androconia (pL 52, figs. 8, 9), 



Thanaos persius (p. 211). 

 f. Size larger; fore wings seldom less than 17 mm. in 

 length; costal fold of males with no rodlike sub- 

 equal androconia, the nearest being much more 

 than twice as stout apically as basally. 

 g^. Upper surface of fore wings flecked with whitish 

 scales throughout, so as to be quite different in 

 general tint from the hind wings (pi. 51, figs. 



4-7) Thanaos juvenalis (p. 212). 



g'. Upper surface of fore wings flecked with whitish 

 scales only in small patches (pi. 51, figs. 1-3). 



Thanaos horatius (p. 213). 



