' 1884.] • • . 81 



Ion an undescribed butterfly of the genus teeacolus 



from arabia. 



BY ARTHUR G. BUTLER, F.L.S., F.Z.S., &c. 



The Britisli Museum has recently been enriched by the receipt of 

 a fine collection of butterflies from Aden, and a smaller series from 

 the Somali country, collected and presented by Major J. W. Terbury ; 

 the smaller series contains both sexes of Teracolus Chrysonome of the 

 ■' SymbolaB physicse." 



Hitherto, T. Chrysonome has been represented in the Museum 

 collection by an Arabian species allied to my Abyssinian T. gaudens, 

 but smaller than any other species of the group to which it belongs ; 

 it differs at a glance from T. Chrysonome in its inferior size (34 instead 

 -yi 38 — 41 mm. in expanse of wing), its paler and duller coloration on 

 3oth surfaces, bringing it nearer to the T. Fausta group, the abbrevia- 

 ;ion of the black sinuous stripe across the primaries, and the larger, 

 nuch more confluent, and pinker tinted markings on the under-surface 

 3)f the secondaries : to this species I propose to give the name of 

 r|ir. arenicolens. 

 '! Teeacolus arenicolens, sp. n. 



Upper surface sandy-ochreous, with the reins slenderly black ; primaries white 

 rom the base to the end of the cell, slightly tinted with bluish on inner margin ; 

 V small, transverse, black discocellular spot ; a bi-angulated, discal, black stripe from 

 he costa, about half way between the cell and apex to the second median nervule j 

 ; squamose, blackish, sub-marginal stripe, best defined upon the veins ; secondaries 

 iluish-white at the base, otherwise finely irrorated with grey, with the exception of 

 n elbowed discal series of spots and a marginal series between the veins ; body 

 'lackish above, the abdomen pale sandy-brownish at the sides ; primaries below pale 

 «ffron-yellow, becoming pale creamy sulphur-yellow on internal area and at apex ; 

 1 ihe upper surface markings represented in rosy greyish ; a minute black dot on the 

 Qterno-median interspace beyond the middle ; secondaries pale creamy-yellow, 

 raversed by four nearly equidistant series of sub-confluent, rosy-greyish, more or 

 388 fusiform, spots ; body pale creamy -yellow. Expanse of wings, 34 mm. 



S- Arabia {BecTcer). Type, Brit. Mus. 



It is unfortunate that no more exact habitat was received with 

 iP fcis species. 



The true T. Chrysonome will have to be placed between T. aurigi- 

 f leus from Victoria Nyanza and T. gaudens from Abyssinia ; the latter, 

 4 khich measures 46 mm. in expanse, is the nearest ally of T. arenicolens. 



British Museum : 



August, 1884. 



