BUTTERFLIES OF THE VICINITY OF NEW YORK CITY 
cabbage and allied plants. The species is found in the United 
States from ocean to ocean, and also in Mexico. It was common 
about New York in former years, but since the introduction of the 
Imported Cabbage Butterfly it has disappeared almost entirely, 
though it is sometimes common for only a season or two in certain 
localities. 
10. Dog’s-Head Butterfly (Colias cesonia). 
This southern species is occasionally taken in this vicinity. In 
the South it is common. It may be known readily by the yellow 
dog’s-head patch on the fore wings, and broad black borders. 
11, Clouded Sulphur Butterfly (Colias piiilodice). 
Very common everywhere in this neighborhood, along roadsides, 
in open fields and in gardens. It is especially common when the red 
clover is in blossom. Sometimes hundreds of these yellow butter- 
flies may be seen in dense masses upon wet spots in the road, swarming 
when disturbed and settling again when the interruption ceases. It 
is apparently triple-brooded, and may be found on the wing from 
the latter part of April until about the middle of October. The 
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