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Progne
Butterfly.-A rather small species, with light-fulvous fore wings, shading into yellow toward the outer margins; the dark markings slight, but deep in color. The secondaries are heavily bordered with black on the outer margin. On the under side the wings are very dark, variegated with paler shades, somewhat as in G. gracilis. Expanse, 1.85-2.00 inches.
The early stages have been quite fully described by various authors, and the reader may consult "The Butterflies of New England," vol. i, pp. 266-268, for a full account. The caterpillar feeds on the elm, but more commonly on various species of the Grossulacae, or currant tribe, wild or domesticated. It ranges from Siberia to Nova Scotia, and southward as far as Pennsylvania.
There are several other species of Grapta found in our fauna, which are not delineated in this book; but they are rare species, of which little is as yet known. The types are in the collection of the writer, and if the reader finds any species which he cannot identify by means of this book the author will be pleased to help him to the full extent of his ability.