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I     36 Kentucky Butletliw, N0. 265  
1   gi ig collected in 1832, 1833 and 1834 at Cambridge, Massachusetts. _
  ``‘_-»        The reason for the slow spread of the insect, as explained in a i
"° 5     recent letter by Professor Charles W. Johnson, Curator of the   —
_ {Q .,-     Boston Society, is the shortness of the wings of a form of the  
` I ‘ 8 .   I I female, which renders it practically unable to fly. I
Q .   This explanation seems entirely reasonable in View of the
‘ c   I fact that most of the females at the north and east are of the
I     I short-winged form (80 per cent according to Professor Osborn) I
L_ I .._· L _     and from experience north of the Ohio river this condition seems
of     likely to continue in northern latitudes. The females collected
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