52 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[446 



Table III 

 The following table shows the relative size of hexagonal cups in various 

 forms and parts of the same elytron, etc. 



Species 



C. purpurea. 



scutellaris. 



generosa. 



chinensis.. 



Variety 



denzlerensis. 

 lecontei 



scutellaris 



rugifrons 

 modesta .... 



Massachusetts- 

 Chicago 



Penver 

 Chicago. 



Locality 



Organ 



Part 



Color 



Colorado 



China 



Diameter 

 in mm. 



0.01 is 

 0.0150 

 0.0115 

 0.015 



0.0150 

 0.0150 

 0.013 



0.0115 

 0.0 1 00 

 0.0 1 00 

 0.0150 



I 0.015 to 



-j 0.0225 



[0.018 av. 

 0.013 



GEOGRAPHIC VARIATION IN COLOR 



The black forms of C. scutellaris are found to occur in some 

 New York localities, and some New England localities, but are 

 less numerous than green ones. A complete catch from Providence, 

 Khode Island, for one season, including hibernated and freshly- 

 emerged forms, showed less than 20 per cent black individuals; 

 a similar catch from Framingham, Massachusetts, gave no black 

 individuals; 112 specimens from Aqueduct, New York, showed 

 about 15 per cent black. Some localities in New Jersey show, 

 according to Leng, a majority of black forms in spring. A small 

 catch from Baltimore, Maryland, showed more than half black forms. 

 At Raleigh, North Carolina, black forms do not occur, and I find no 

 records for Virginia, North Carolina, and South Carolina; but black 

 forms occur in Alabama, Georgia, and Florida. At Mobile a few black 

 ones are found in the autumn but very few or none at all in the spring, 

 according to Messrs. Loding and Van Aller who have been interested in 

 them for several years. None are recorded for points farther west. 



Black forms of C. sexguttata likewise occur in the eastern states, 

 New Jersey and Pennsylvania, but not in the southern localities. Black 

 forms of C. purpurea (see map, Fig. 472) occur in Illinois, Iowa 



