100 
BRIMSTONE BUTTERFLY. 
Goncpieryx Rhamni. 
PLATE Y. Fig. 1. 
Pap. Rhamni, Linn Donovan, v. 1, Pi. 115. 
This insect, and a few otliers, were first formed 
into a distinct genus by Dr Leach, on account of the 
peculiar shape of the wings, which are large and an- 
gulated.* The antennm are rather short and robust, 
thickening gradually near the summit into an obtuse 
club : the palpi project a little beyond the head, 
and are compressed, the radical joint longest and 
curved, the terminal one minute and conical : all the 
legs are perfect, and alike in both sexes ; the claws 
bifid (PI. I. fig. 13.). Under wings grooved to re- 
ceive the abdomen. 
The male is entirely bright sulphur-yellow above, 
and the female greenish-white, both sexes with a 
small round orange spot near the middle of each 
wing, those on the upper wings being smallest, and 
a few minute rust-coloured dots along the outer 
edge. The under side is paler than the upper, and 
the central spots rust-brown round the margin, and 
* Named from an angle, and vn^vt a wing. 
