Butter/lies of Bulgaria. 201 



specimens winch are difficult to distinguish without 

 having recourse to the genitalia, which agree very well 

 with those of medusa and cemc, and seem to me to prove 

 that the two forms are distinct species. Dr. Chapman, to 

 whom I sent specimens of both forms, says that he is able in 

 all cases to distinguish them by the antennae. In medusa 

 the club is yellow-brown beneath, and in Oime the same 

 part is black. 



Probably hybrids between the two occur. 



89. E. mclas, var. 



A single specimen of this species taken on Belmecan, 

 October Sth, was sent me recently by Radomir Kezant- 

 chieff, who returned to Kostenetz after we left in hopes of 

 getting more specimens, including the female of U. gorgone. 

 As his experience may be usefid to other entomologists I 

 give an extract from his letter. 



He started for Kostenetz on August 9th, two weeks after 

 we parted, the weather being just as rainy as when we 

 left, and stayed a week in the valley of Airandere, at the 

 gendarmerie hut, but owing to persistent rain and mist got 

 only a few specimens. Then he returned to Kostenetz and 

 ascended the mountain called Belmecan, 8600 feet high, 

 where he found a great many of what he thought to be 

 the same as E. gorgone, but not having a net with him was 

 only able to take a few with his hands. Having found a 

 good place to collect in he returned, but bad weather 

 again set in, and lasted two weeks. All the specimens 

 taken on these occasions were sent to me by post, but 

 have been lost with the exception of E. iiiclas. 



90. E. la^ypona, Esp. 



On the bare grass-covered tops and flatter slopes of the 

 Rilo Dagh above 7000 feet, coninion, but most abundant at 

 about 8000 feet, and the only Erchia which was found 

 abundantly at high levels, though medusa and ceme also 

 occurred in the lower part of its range. 



The first specimens Avere taken at the end of June, and 

 continued to appear till the middle of July. On the 

 average the specimens are larger and brighter, with the 

 inner bands on the fore-wing above and the bands of the 

 hind-wing below more strongly marked than in specimens 

 from the Alps. 



