88 THE entomologist's record. 



of St. Moritz, and possibly on to that of Campfer, and my special 

 object the acquisition of Brenthis arsilarhe, which I had been given to 

 understand occurred at the edges of these lakes. As I was travelling 

 with friends who were going to Pontresina I changed at Saraaden and 

 went on with them, and starting off from Pontresina station by the 

 wood path, made my way as far as the little Statzersee without meeting 

 with any species of butterfly except Erebia Ivjea var. adijte. I had 

 hoped to find B. arsilache at the edge of this little lake, but found no 

 butterflies at all on the lake side of the road. On the bank sloping up 

 to the right of the road Coenoninnplia paniphiliis and (J. sati/rion, — of 

 course in this district var. unicolor, — were abundant, and I saw a 

 specimen or two of Brenthis eiiphrosi/ne, but in poor condition ; a little 

 farther on Vacciniina optih'tc was to be found on the same side of the 

 road, together with Poli/onunatiis In/las, P. icarus and Aricia medon 

 {astrarche), as well as the three species previously mentioned, and after 

 passing the Restaurant just above the end of the Lake of St. Moritz, 

 in a hollow to the right of the road Alhulina pheretes was not uncommon 

 on the thjane blossoms, where Plebeius ar(ii/ro(/nomon and A(jriades 

 thetiH were also to be seen. Almost immediately below this, in the 

 meadow leading down to the lake, I came across Brenthis pales var. 

 isis, $ s only in considerable numbers, some of the black spots from 

 the upperside forewings of which showed through on the underside, so 

 I concluded that it was useless to go on farther and had made up my 

 mind that a mistake had arisen between this form and B. arsilache. 

 On examining IVJr. A. H. Jones's specimens from this neighbourhood 

 after my return home I find that the mistake was my own, as he has 

 both isis and arsilache from these parts, the former occurring in the 

 meadows, the latter only in the swamps on the edge of the lakes, where 

 one must be prepared for a good wetting if one determines to take it. 

 It is some consolation that he assures me that had I penetrated the 

 marshes I should almost certainly have been too early, in view of the 

 fact that isis was so fresh and that only J s of this latter were to be 

 seen. I still think it probable however that the confusion between 

 B. pales and B. arsilache may have been caused, in part at any rate, by 

 those specimens of the former which show some black spots on the 

 underside forewing. The corresponding spotting in B. arsilache is 

 altogether different. It is far blacker, strong and very pronounced, 

 and does not in any degree give the idea of showing through from the 

 other side. The upper side of the same wing is again far more 

 strongly marked especially in its basal half ; the transverse line 

 nearest to the base is in B. arsilache so much further removed from the 

 root of the wing as often to join the next transverse line, and to make 

 an intricate black pattern with it and the half line starting from the 

 COsta which lies between the two ; almost always on the upper side, 

 and often on the under, the inner margin displays the curious .r mark 

 BO familiar in Mclitaea deione var. herisalensis, and which sometimes 

 appears in the type deione also. The general appearance of the under- 

 side hindwing is also very different; the long yellow streak from near 

 the middle of the outer margin which is so very conspicuous in all 

 forms of isis, and always in the ? and generally in the <? of the type 

 B. pales also, and which even when not very conspicuous is always 

 easily traceable, is, when visible at all, represented in arsilache, even in 

 the 2 , by a slight enlargement of the orange-brown inside the lunule, 



