ABT. 11 



NOTES ON THE MELITAEID BUTTERFLY — CLu^RK 



somewhat brownish; but the restriction of the submarginal orange 

 spots, especially on the fore wings, easily distinguishes them. Three 

 of these have both the orange spots in the cell of the fore wing pres- 

 ent, though reduced, and the fourth has the outer present, rather 

 broadly divided in the middle; one has faint indications of the two 

 orange spots in the inner part of the hind wings. 



Size. — We have measured the maximum expanse of 186 specimens. 



The 116 males were found to range from 45.0 to 64.0 mm., averag- 

 ing 52.7 mm. 



The 70 females were found to range from 50.4 to 70.2 mm., aver- 

 aging 60.4 mm. 



There is no appreciable difference in size between northern and 

 southern examples. 



The 17 males from New Jersey and northward range from 49.4 to 

 60.0 mm., averaging 54.5 mm. The 99 males from the vicinity of 

 Washington range from 45.0 to 64.0 mm., averaging 52.5 mm. 



The 8 females from New Jersey and northward range from 54.0 to 

 69.8 mm., averaging 59.5 mm. The 61 females from the vicinity of 

 Washington range from 50.4 to 67.8 mm., averaging 60.3 mm. 



The two largest specimens are a female from Newtonville, Massa- 

 chusetts (69.8 mm.) (pi. 2. figs. 13, 14), and another from Missouri 

 (70.2 mm.). 



In studying this butterfly one gets the impression that in the 

 North there is less difference in size between the sexes than in the 

 South, the males being larger and the females smaller; but the figures 

 show very little dift'erence. 



In the South the extremes in size are slightly more in the males 

 (a difference of 19.0 mm.) than in the females (17.4 mm.), while in the 

 North the reverse would seem to be the case, the range in the females 

 (15.8 mm.) being greater than that in the males (10.6 mm.); but 

 our northern material is not sufficient to enable us to speak with any 

 degree of certainty. 



Frequency of different sizes in Euphydryas phaeton 



