Some lifecycle questions about the Silvery Blue

[Roger Kuhlman]

Paul Opler's Eastern Butterfly Guide says that the larval food of the 
Silvery Blue (Glaucopsyche lygdamus) are vetches. Does the butterfly 
have a preference among vetches or does it vary geographically? Someone 
told me that the butterfly prefers purple vetch in SE Michigan. Is this 
true?

Also how does the Silvery Blue spend the winter? As eggs, caterpillars, 
or in a cacoon. I would to observe some feeding caterpillars.

Roger Kuhlman
rkuhlman at hotmail.com
Ann Arbor, Michigan
5-29-98

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