NATURAL HISTORY OF THE BERMUDAS. 319 



Hamilton in the Bermudas, hundreds being seen at the 

 same time hovering in every direction. These disappeared 

 in a few days. In the following year this Butterfly was 

 very rare in the same locality, though the Rev. H. B. 

 Tristram informed me of his having seen at least fifty on 

 one day near the Flatts. On the 22nd of September, and 

 1 2th of November, 1849, a few specimens were recorded ; 

 and on the 15th November, 1850, a few more, being the 

 only ones observed in that year. 



It would appear, from these dates, that Terias lisa comes 

 forth late in the autumn. It is also probable that the 

 specimens seen in the Bermudas in the years 1848 to 1850 

 were descendants of the numerous visitation of October, 

 1847. Between October, 1840, and October, 1847, the 

 occurrence of this Butterfly had not been noticed in 

 those islands. The plant whereon the caterpillar of this 

 species feeds in the southern States of America is unknown 

 to me ; and it is just possible that the absence of its 

 favourite food in the Bermudas may have been the cause 

 of the diminished numbers of the perfect insect seen there 

 after the year 1847. 



Assuming (for I am no entomologist) that Terias lisa 

 abounds in the southern States of America during the 

 months of September and October, and, bearing in mind 

 that at that season of the year violent revolving gales from 

 the vicinity of the equator occasionally pass in a northerly 

 direction, midway between the American coast and the 

 Bermudas, extending in area from one to the other, prior 

 to curving on their cyclonic course to the north-east, en 

 route for the frozen regions of the pole ; that such storms 

 have not unfrequently a radius of three hundred and forty 

 geographical miles ; that the inner portion of the circle 

 may be considered as a hurricane of wind and rain, 

 moderating towards the outer circumference to squalls and 



