BUTTERFLIES OF THE DISTEICT OF COLUMBIA 183 



The sixth female form (No. 6; pi. 39, figs. 1, 2) is black or brown- 

 ish black with the yellow areas of the fore wings beyond the inner- 

 most black band and of the hind wings beyond the narrow black 

 stripe thickly speckled with yellow or whitish scales, most abundantly 

 toward the lower border of the fore Avings and the upper border 

 of the hind wings. Like the preceding, this form seems to have both 

 a whitish and an ochreous phase. The latter was figured by W. H. 

 Edwards. This form is infrequent, though not rare, at least in cer- 

 tain seasons. I took one at Cabin John in 1925 and five at Silver 

 Spring in 1927. A yellow female taken September 1, 1928, is curi- 

 ous in having a considerable dusting of dark brown scales on the fore 

 wings between the lower borders and vein Mo. 



The males are divisible into the usual clear light yellow males, 

 which are by far the commonest, ochreous males, which are rather 

 rare, and short- winged males in which the outer and lower margins 

 of the fore wings are at right angles to each other, and the hind 

 wings are unusually broad. 



The interrelationships of the several local forms of the female of 

 this butterfly when typically developed may be appreciated from the 

 following key : 



KEY TO THE FEMALE FORMS OF PAPILIO GLAUCT78 



o'. Predominantly yellow. 



b\ Yellow between the base of the wings and the innermost band 



on the fore wings and the long stripe on the hind wings the 



same as that of the other yellow areas. 



cV Yellow of wings ochreous, usually darkest on the fore wings 



and on the inner half of the hind wings; tails slender, 



narrow throughout, or much broadened in the outer half ; 



scallops of the hind wings deep ; process between tail 



and anal angle long, with the sides of the black central 



portion parallel for some distance (pi. 37, fig. 2) No. 2. 



&. Yellow of wings light and clear ; tails broad ; scallops of the 



hind wings relatively shallow; process between tail and 



anal angle short, the sides of the black central portion 



converging, not becoming parallel. 



d\ Few or no blue scales on the discal area of the hind 



wings (pi. 37, fig. 1) No. 3. 



a^. Yellow of hind wing thickly speckled with blue scales, 

 appearing opalescent whitish; blue scales also occur 

 along the basal side of the lower end of the innermost 



black stripe on the fore wings (pi. 38, fig. 1) No. 4. 



6^ Region between the base and innermost band on the fore 

 wings and the base and narrow stripe on the hind wings 

 deeply infuscated with sooty brown scales, which are also 

 thickly speckled over the remaining yellow areas (pi. 38, 

 fig. 2) No. 5. 



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