LEPIDOPTEROUS PUPyE AND THEIR SURROUNDING SURFACES. 
441 
represents the less dark (1), y, possessing a dark greyish-green ground¬ 
colour, but with an unusual absence of black patches. Fig. 27 represents 
a (1), /3, with the normal black patches, but with the ground-colour 
unusually free from grey dusting, and therefore of a peculiarly bright 
whitish-green tint. This variety was produced in some instances by the 
use of a pale bluish-green background (tig. 20) and by means of a white 
background. Fig. 28 represents the bright yellowish-green variety called 
(2) in the paper, produced chiefly by the use of green tissue - paper 
surroundings. There is little black pigment present. Figs. 29 and 30 
represent the bright-green variety called (3) in the paper, and chiefly 
produced by the use of orange surroundings. The latter figure is an 
unusually bright variety. The black pigment is even more deficient than 
in (2). 
Fig. 31. Natural size ; a green pupa of P. rapce, called (5) in the paper, but with an 
unusual amount of pigment, so that, if it were less green, it would belong 
to the degree of colour called (3). 
Figs. 32-41, inclusive, all X 2, represent the chief varieties of the pupae of P. rapce. 
Fig. 32 represents the darkest variety, called (1) in the paper. Fig. 33 
represents a (2), being very dark, but lighter than the last. Fig. 34 
represents a light (3), with the ground colour distinctly visible through 
the smaller amount of pigment. Figs. 35-38, inclusive, represent various 
forms of the degree of colour called (4) in the paper, 35 possessing a 
greyish-white ground-colour, while 36 is distinctly pinkish, 37 yellowish, 
and 38 greenish, and forming the transition to the greener pupae next 
figured. The amount of pigment is seen to be very small in pupae of the 
degrees of colour called (4) and (5). Figs. 39-41, inclusive, represent the 
varieties included in the degree called (5), 39 being of a pale yellowish- 
green, and 40 and 41 representing two aspects of the brightest green 
variety. 
3 L 
MDOCCLXXXVTl —B. 
