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end of October, about wliich time it descends into 
the earth, and forms the pupa. This is twice the 
size of a Mustard seed, of nearly the same colour, 
but different in shape, which is ovated, divided 
into numerous seg'nients, or annular joints, and 
remains in this state, till the month of May, when 
the animal emerges in its perfect state, consider- 
ably less than the House-Fly. It is very similar 
in shape, yellowish body, wings transpai'ent, mark- 
ed indiscrimately with irregular sized spots of a 
chocolate colour, similar to the parent of the 
Tenthrida Flava, 
It appears to me that there must be two 
broods in one year, as the time is so long between 
the parent emerging in May, and the time I dis- 
covered the larvae in August ; and as it is more 
likely tlmn otherwise that copulation takes place 
soon after those insects arrive at the emago or 
perfect state, those that are met with feeding in 
August are a second generation. Though the 
Celei’y may not have been the prey of the first 
brood, yet there may be other plants equally suit- 
able to their palate, and the Celery must fidl in 
the way of the second ; but as they have never 
come under my noti ce, either before or since the 
years 1823 or 24, (a memorandum of the exact 
year having been omitted) I have not had an 
opportunity to come to a clear decision on that 
point. The effects of their depredations will be 
exhibited by the infested pai-ts turning brown, and 
withering. Some crops in the above year, in the 
