1883.] . • 151 



years, I find myself in possession of sufficient materials for completing 

 what I Lad, through the kindness of Dr. Buchanan White, so long 

 ago begun. 



For most of what follows I have been indebted to the very kind 

 help I have had the pleasure to receive from Mr. George T. Baker, 

 and his friend Dr. Jordan of Edgbaston, both having supplied me 

 with numerous examples of the larva of exulans, in different stages of 

 growth, together with their observations of its habits, taken in 1882-3 

 during their summer visits to the Swiss Alps. 



Two series of the larvse in fours reached me on July 13th, 14th, 

 and a single larva on the 16th ; these were forwarded by Dr. Jordan 

 from Zermatt, having been found by him at an altitude of about seven 

 thousand feet, at the Schwarzen See near by, feeding, while nearly 

 buried in the tufts of leaves of Silene acaulis, and often quite buried 

 in the fleshy mass of CTierleria sedoides, where they seemed to have 

 eaten out their own shape, some were also seen to be feeding on 

 Trifolium alpinum, Geum montanum, Sibbaldia procumhens, and 

 AlcliemiUa alpina. 



Some of these larvge had spun themselves up, and their cocoons 

 got ruptured, and the half-formed pupse had fallen out during their 

 journey hither, while others arrived in very perfect and lively condition, 

 from which I secured figures and descriptions ; two much smaller 

 than the others fed but very little, and in August, laid up motionless 

 for hibernation ; one of these became attacked with mould in Septem- 

 ber and died, but the smallest of the two slept safely through autumn 

 and winter until the 19th of April, 1883, when it began to crawl about 

 rather feebly in quest of food ; it was then supplied with a small spray 

 of Medicago lupulina and a leaf of Rumex acetosa ; next day I could 

 see it had partaken of both, though sparingly ; afterwards it ate of 

 Trifolium repens and pratense, lapsing occasionally into slumber until 

 the end of the month, when it died, probably from the necessity of 

 changing the leaves having disturbed it while waiting to moult ; thus, 

 in one state or another, all the above mentioned died off. 



This year, in June, the same two friends were in Switzerland 

 together, and while walking over the south side of the Great St. 

 Bernard, where some of the snow had melted (later than usual), they 

 found hundreds of the larvae of exulans feeding in the sunshine on 

 Silene acaulis and AlcliemiUa alpina ; a great number of them were 

 brought home by Mr. Baker, who most kindly sent to me on 6th of 

 July seven very fine larvse in perfect condition, besides three that had 

 already spun up in cocoons in boxes before his return, and mentioned 



