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FEB241919 

 L*Sonian ij^-" 



THE ENTOMOLOGIST. 



Vol. LIL] FEBEUAEY, 1919. [No. 669 



ON THE SPECIFIC DIFFERENCES OF EREBIA LIGEA, 

 L., ITS ARCTIC FORMS, AND EREBIA EURYALE, 



ESP. 



By H. Rowland- Beg wn, M.A., F.E.S. 



Ix the ' Bulletin de la Societe lepidopterologique de Geneve," 

 vol. iv, Ma}"-, 1918, under the title " Krebia euryale, Esp., 

 quelques-unes de ses Varietes et Aberrations " (pi. i, fig. 1, a 4), 

 Dr. 0. L. Reverdin establishes the specific values of E. euri/ale, 

 Esp., and E. ligea. L., and appears to solve the problem of the 

 relationship of Hiibner's adyte. His conclusions are most 

 welcome to those of us interested in the difficult group of Erebias 

 to which the two species belong. Superficially, as well as 

 anatomically, he shows that ligea and euryale are entirely 

 separate, the androconia markedly different ; the appendages- 

 sufficiently so to constitute by themselves a test, though Dr. 

 Chapman was not satisfied on this point when he published his 

 " Review of the Genus Erehia " (' Trans. Ent. Soc.,' London, 

 1898). 



I give overleaf an abstract of Dr. Reverdin's diagnosis which 

 should help to make the separation of the two species less 

 difficult. 



The test difference of S' adyte, Hb., and typical euryale is the 

 disappearance of the dirty white markings, leaving the whole 

 under-side of uniform reddish-brown. 



Hiibner's figures are Ligea, 225-8 ; Philomela, 218-9 ; 

 Euryale, 789-90 ; and, as an aberration of Euryale, an albinistic 

 form referred by Meyer-Diir to Medea {jEthiops), but by 

 M. Oberthiir to Euryale, who has given the name hiiehieri to 

 this form, having two <? <? and two ? ? in his collection. In 

 the copy of Hiibner's work in the Walsingham Library at South 

 Kensington all these figures are remarkably fresh and vivid. I 

 agree with Dr. Reverdm's several identifications, while noting 

 that Meyer-Diir states that Freyer's euryale (vol. i, tab. 61, 

 figs. 3-4) is " our adyte," and further, that Freyer's figures {loc. 

 cit., tab. 91, figs. 1-2) must be regarded as the typical euryale 

 of the Silesian mountains. 



ENTOM. FEBRUARY, 1919. D 



