288 Dr. T. A. Chapman's Contribution to 



My bred specimens (nearly a score in number, more if 

 the probable result of larvae given away be included) are 

 of large size ranging up to 38 mm. in expanse, the females 

 also are large (36 mm.) with much blue marking. 



Those of Le Lautaret and Bourg d'Oisans origin were not 

 kept separate, but the whole lot are very uniform, and 

 both sets must be represented. They are of course either 

 of the spring emergence or of the single-brooded race ; in 

 accordance with this I find the androconia are of the escheri 

 pattern, mth a few odd scales intermixed, varying down 

 to tJier sites summer form. 



Such trifling variation presents itself not infrequently 

 in other species, but until looked for does not modify the 

 impression of absolute uniformity. 



Mr. Francis I. Ball finds that A. ther sites occurs in 

 Belgium, and has allowed me to examine some specimens. 

 I submit a separate communication arising out of his 

 observations of these specimens. 



I entertain little doubt that in Belgium, A. thersites is 

 single-brooded, and is thus brought into relation with my 

 specimens from Le Lautaret. The specimens are rather 

 small, ranging from 29 mm. to 35 mm. in expanse, and 

 very similar in size and appearance to specimens of P. icarus 

 which accompanied them. 



The discovery of a single-brooded form at 7500 ft. and 

 over at Le Lautaret and of the same form in Belgium 

 makes my view that A. thersites has somewhat Southern 

 climatic proclivities untenable. Its rather Southern 

 distribution is clearly not directly due to climate, but 

 only indirectly in so far as climate affects the distribu- 

 tion of Onobrychis (Sainfoin). When an alpine form of 

 Sainfoin occurs at a high elevation, A. thersites is able to 

 accompany it. 



In the Entomologists' Record, A. thersites is reported 

 from Constantinople by Mr. Graves (vol. xxv, p. 139) ; by 

 Mr. Curwen, and especially in a detailed paper of some 

 interest by Mr. B. C. S. Warren from the portion of the 

 Rhine Valley about Bex and St. Triphon, thus much 

 diminishing the long stretch of the valley from which I 

 previously had no records (vol. xxv, p. 253), and (p. 301). 

 Messrs. Buxton record the species from Creece (Epidaurus, 

 April 21st) (Ent. Rec, vol. xxvi, p. 50); these are rather 

 small specimens, probably of the spring brood. Commander 

 J. J. Walker has found a $ specimen among the remains 



