LEPIDOPTEROUS INSECTS. 93 
colour than the females, and, not unfrequently, of 
totally different colours. Want of experience in 
this department, led the great Linneus into an 
egregious blunder ; for he considered them not only 
specifically distinct, but also as belonging to different 
families. His divisions of Trojans and Grecians is, 
in many instances, liable to this objection. The male 
Brimstone Butterfly, (Gonepterya Rhammni,) is of a 
beautiful sulphur yellow; while the female is of a 
dirty greenish white. In the Orange-tip Butterfly, 
( Pontia cardamines,) so named from the fine orange 
spot towards the points of.its superior wings, the 
spot is possessed by the male only. The male Argus 
Butterfly, (Polyommatus argus,) has the upper sur- 
face of the superior wings of a dark mazareen blue ; 
while those of the female are of a deep brownish 
purple. 
The female butterflies are less frequently to he 
seen than the males, as they conceal themselves in 
some quiet retreat. In these situations, they are 
supposed to be discovered by the sense of smell in 
the males, which can be accomplished at a great 
distance. This has long been known to British 
entomologists. For we find, by the writings of Barbut 
and Moses Harris, that they were aware of this fact, 
and practised a mode of catching the males, which 
they termed sembling, from possessing a female of the 
species in confinement. Haworth says, “It is a 
frequent practice with the London Aurelians, when 
