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black bands broader than one-half the width of the intervening 
ones, while in the unio their average width is double that of the 
■white. The spots on the caudal hump in grata are isolated, while 
in unio those in each row are connected by the black band to which 
they are united. The feature which should serve better than any 
other to distinguish the unio is the blackish coloring above the pro¬ 
legs and continued on the two following segments, the three pili¬ 
ferous spots above the pro-legs being connected with it. 
It feeds on Epilobium coloratura, and, according to Dr. Fitch, on 
the Grape-vine. They bore into decayed wood or other soft. sub¬ 
stances to transform. 
AcOLOITHUS AMERICANA, Boisd. 
Larva tapering toward each end; sulphur-yellow, with six tufts 
of black prickly hairs placed transversely on each of the segments, 
the tufts on the dorsum being more distinct than those on the sides. 
The first segment is- black with a yellow edge, and the spots on the 
eleventh and twelfth segments run together. Head small, brown, 
retractile, being usually concealed within the first segment. 
When young they feed together, arranging themselves side by 
side, and beginning at the edge of the leaf and eating the softer 
parts, leaving the small veins; but as they become older they leave 
only the larger veins. 
When full grown they disperse over the vine, or leave it, and spin 
tough whitish flattened cocoons. 
They feed on the Grape-vine and Virginia-creeper. 
Acoloithus falsarius, Clem. 
These larvae live solitary, or not more than two together on a 
leaf, in which they eat small holes. They live on the Grape-vine 
and Virginia-creeper (Ampelopsis quinquefolia). 
