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GENUS I. BUTTERFLIES. 



SEC. V. YELLOWS. 



Caterpillars thinly covered with fine hairs: they fix themfelves by a filky 

 thread round the middle, and by the tail, when about to change to chryfalis. 



S P. XXXVI. BRIMSTONE YELLOW. 



PI. 31. 



Rhamni. Linnœus. 

 Brimftone. Harris. 



This butterfly appears on the wing in March, if the weather be mild; and 

 the female lays her eggs in April, moftly on the buck-thorn, or wild rofe bufh. 

 The young caterpillars are bred in a few days afterwards, and as they increafe 

 in fize they fhift their fkins, generally about every fourteen days. They arrive 

 at their full growth, as at fig. 1, the middle of June; and in a few days after 

 change to chryfalis, as at fig. 4. The flies from thefe are moftly out on the 

 wing the firft week in Auguft. The caterpillars from the eggs of this brood of 

 flies are full fed in September, when they go through the ufual metamorphofis, 

 and the chryfalides are perfected. In this ftate they remain till March following, 

 when a warm day brings them out on the wing. The female is nearly white, 

 and is reprefented at fig. 2. The male, of which the under fide is feen at fig. 3, 

 is of a very brilliant yellow colour. This infect is very common in die 

 winged ftate, but the caterpillars are rarely met with. 



