174 THE COLORING OF BUTTERFLIES, 



this form overlap each other so as to be distin- 

 guished with difficulty ; butterflies of the earliest 

 brood continue to emerge from the chrysalis until 

 after the first week in July, while those first dis- 

 closed lay eggs early in June, so that the earliest 

 individuals of the second brood of Marcellus ap- 

 pear as soon as some belated individuals of the 

 first brood ; the attempt to trace the sequence of 

 the broods is therefore hopelessly bewildering ; 

 and we can only judge by the comparative abun- 

 dance or rarity of fresh individuals that there are 

 three or four broods of this form alone. Eggs, 

 caterpillars, chrysalids, and butterflies may still 

 be found together until the frosts come and de- 

 stroy all except the chrysalids. 



This insect is native to the Southern States, 

 and though its range is great, it does not extend 

 over regions of very varied temperature. Were it 

 otherwise we might look for further variations, 

 such as would appear when comparing northern 

 and southern individuals. And there is reason 

 to believe that such a complication does exist in 

 one of our New England butterflies whose history 

 has been partially traced. 



This butterfly, the Spring Azure (Cyaniris 

 Pseudargiolus) [Figs. 148, 149], which appears to 

 extend from Boston to San Francisco and from 

 Labrador to Texas, has been described under half 

 a dozen different names, principally owing to the 



