1912. 



NATURAL SCIENCES OF PHILADELPHIA. 



255 



series from southwestern North Carolina to prove to us that inter- 

 graduation does exist. 



The characters of typical individuals of the two races can best be 

 shown in tabular form: 



S. marmorata. 



Wing narrower, its greatest width 

 contained one and three-fourths 

 to one and seven-eighths times 

 in the length. 



Disk of wing sulphur-yellow. 



Wing band relatively narrow, 

 always narrower than the 

 width of the colored disk, never 

 continued around to the inter- 

 nal margin of the wing. 



Disk of pronotum frequently with 

 pale decussate markings. 



S. marmorata pida. 



Wing broader, its greatest width 

 contained one and one-half to 

 one and three-fourths times in 

 the length. 



Disk of wing varying from deep 

 chrome to cadmium-yellow. 



Wing band relatively broad, rare- 

 ly narrower than, usually as 

 broad as the width of the colored 

 disk, continued around to, or 

 nearly to, the internal margin of 

 the wing. 



Disk of pronotum never with 

 pale decussate markings, uni- 

 form in color. 



In addition to these features certain others are evident in a number 

 of specimens, but not so consistently as to be considered diagnostic. 

 These are the usually more distinct median carina of the pronotum 

 of marmorata, the very frequent breaking up in pida of the three 



Figs. 11 and 12. — Tegmen and wing of male of Scirtetica marmorata (11, Clemen- 

 ton, N. J.) and of same sex of S. marmorata pida (12, Miami, Fla.). ( X 1J.) 



usually present and well-defined dark tegminal cross bars of mar- 

 morata 21 and the usually more robust build of marmorata. The 

 pronotum of marmorata is more constricted cephalo-mesad than is 



21 In the unicolorous individuals which occur in both races these maculations 

 are almost absent. 



