the umbelliferous plants, and is mod frequently 
found on fennel: it is alfo fometimes feen on rue 
and other plants. It changes into a chryfalis in the 
month of July, and the fly appears in Augufl:; but 
it fometimes happens that two broods of this but¬ 
terfly are produced in the courfe of the fame fum- 
mer ; viz. the firfl: in the month of May, having 
lain all winter in their chryfalis ftate; the fecond in 
Augufl, from the chryfalifes of July; having lain 
in that ftate not more than a month or three weeks. 
An extremely lingular circumftance! and which 
well merits the attention of philofophic entomolo- 
gifts. 
