6 
Indian Forest Records. 
[Vol. VII; 
PART II. 
DESCRIPTIONS OF THE STAGES OF THE INSECT. 
The insect is very easily recognised in all its stages from the figures 
given on Plate IV and general descriptions are hardly necessary. The 
following technical descriptions and illustrations are given as none 
have previously been published.* 
1. The Adult. 
Technical description (after Hampson, 1896, p. 89). 
Generic characters. “ Palpi upturned and slender, the 2nd joint 
reaching above vertex of head, the 3rd long and acuminate, maxillary 
palpi filiform ; antennae of female somewhat thickened and ciliated ; 
mid and hind tibiae with tufts of spinous hair on outer side at base and 
extremity. Fore wing narrow ; vein 2 from near angle of cell; 4, 5 
approximated for a short distance, 10, 11 free. Hind wing with the 
cell half length of wing ; vein 2 from well before angle ; 3 from angle ; 
4, 5 shortly stalked ; 6, 7 from upper angle, anastomosing with 8.” 
Specific characters. “ Pale rufous brown irrorated with black and 
grey ; Fore wing with the costal half strongly suffused with grey ; the 
veins all streaked with black ; some olive yellow on base of costa and 
median nervure on extremity of median nervure and discocellulars ; 
traces of a dark sinuous medial line, with a dark patch beyond it on 
the inner margin and of a very highly dentate oblique dark postmedial 
line bent outwards between veins 5 and 2. [In the Dehra Dun specimens 
the medial and postmedial lines are usually well marked]. Hind 
wing semihyaline, white ; the costal area suffused with fuscous ; the base 
of cilia pale rufous ” 
Wing expanse. Male, 26-32 mm. Female, 28-42 mm. 
Relative 'proportion of the sexes. In a brood of 473 individuals of 
the 5th generation bred in 1916, Dehra Dun, the proportion is :— 
Males 77*4 per cent., Females 22-6 per cent. In two lots of material 
received from Changa Manga, Punjab, the proportion is :— Males 75 
per cent., Females 25 per cent. 
The Egg. 
Colour white, opaline, translucent. Form oval in horizontal section, 
bi-eoncavo-convex in vertical section; dorsal and ventral surfaces 
* I am indebted to my first assistant, Mr. N.C. CHatterjee, B.Sc., and to my senior 
Artist, B Jung Bahadur Singh for careful independent checks of the technical descrip¬ 
tions. C. F C. B. 
[ 151 ] 
