262 



Transactions . 



skin is mottled with brown, the ventral surface brownish. 5th stadium (full- 

 grown) : Dorsal line narrow, reddish. Subdorsal stripes black, tubercles 

 blue. Frequently the subdorsal stripes are connected by narrow black 

 transverse bands about the middle of the segments. Spiracular line 

 interrupted by alternate areas of red and yellow. Subspiracular line black. 



Variation. 



Larva. — There is no marked variation among the larvae, though there 

 may be some slight variation in colour, and also in the comparative lengths, 

 numbers, and coloration of the tubercular setae. It appears that corre- 

 sponding tubercles on many larvae, and even on the same specimen, do not 

 always bear the same number of setae. In many cases the tubercles 

 bear a certain number of white hairs intermixed with the black ones, 

 but this does not seem to be of any physiological importance, since 

 some larvae possess many more white setae than others do. As a rule, 

 such coloration is symmetrical — that is to say, if certain hairs are white 

 on one tubercle the corresponding hairs on the same tubercles of all the 

 other segments will be white also. 



The Imago. — Mr. Hudson records that the species varies a good deal 

 in the extent of the cream-coloured markings. 



Table of Main Protect ice Setae. 



The figures in the following table, though as accurate as possible, are 

 only approximate, owing to the difficulty of correctly counting the setae : 

 but they are of interest since they show various phases of growth which 

 will be dealt with fully in the paragraph on habits. 



Period. 



Length of Length of Number of 



Longest Hairs on Longest Hairs on; Hairs on Dorsal 



Dorsal Tubercle I'^st-trapezoidal ; Tubercle Meso- 



of the Mesothorax of Abdominals. | thorax. 



X umber of 



Hairs on 



Post-trapezoidal 



Abdominals. 



Periods. 



Period of incubation, about fifteen 

 1914. 1st stadium: February 15-19, 



days. Hatched, loth 

 four davs ; length. 



February, 



2nd 



in. 



stadium : February 20-23, four davs : 

 ruary 24-28, five days ; length. ^ in. 

 5th stadium : March 7- 

 14 in. Duration of 



&""■> 16 



3rd stadium : Feb 



Length 



_9l 

 16 



grown, 



length, ^.- in. 



4th stadium : March 1-6, six days ; 

 16, ten days ; length, fin. Length 

 pupal period, March 17 to April 3. 



when full 



eighteen days. Total, forty-seven days. 



Table published by Mr. Quail : 1st stadium, seven days ; 2nd stadium, 

 six days ; 3rd stadium, seven days ; 4th stadium, ten days ; 5th stadium, 

 fifteen days ; 6th stadium, 145 days (hybernated) : 7th stadium, twelve 

 davs ; 8th stadium, fourteen davs. Duration of pupal period, thirty -two 

 days. Total, 248 days. 



