hysstkoma concixnata, stkph. 



]K1 



from the mainland, but these records are old and have never been 

 confirmed. A Dysstroma which I took on July 5th at Tongue in 

 Sutherland was shown at the City of London Entomological Society 

 and doul)tfully assigned to this species. It is, however, tnnu-atu. 

 Placed with a long series of true mncinnata it has a slightly different 

 general appearance and diverges in details, such as the narrowness of 

 the line on the underside of the hindwing (see Pit. vii., tig. 7). 



The genitalia are those of tnmcata. The Hebridean specimens, 

 loo, are said to be tnnirata, so that Arran is the only certain Scottish 

 locality and until recently was the only known British locality. F>ut 

 at the pocket- box exhibition of the South London Natural History 

 Society last year Captain Gwatkin-AVilliams, R.N., showed some Irish 

 Lepidoptera, amongst which were two Dysstromas taken by him on 

 July 14th, 1912. I suggested at the time that these \^'ere ron'-innata 

 and he most kindly lent them to me for further examination. Both 

 are females. Except that they are slightly brighter in colour than the 

 average Arran specimens and have a faint yellowish tinge on the 

 underside they agree with them in all respects. The thick black line 

 on the underside of the hindwings is specially well-marked. They 

 were taken at dusk up on a bare heather-clad bill-side in Achil Island 

 oft' Co. Mayo on the w^est coast of Ireland, a locality in many ways 

 r(!S('mbling the Arran one. 



Captain Gwatkin-Williauis unfortunately did not realise the 

 interest of the capture until it was too late to pursue his investigations 

 further. But we shall probably find the species elsewhere on the hills 

 of this little known coast. 



Outside these two restricted localities in Great Britain the species 

 has not been met with. 



I cannot help thinking, however, that if entomologists who visit 

 Norway will look in suitable localities they will lind it. 



Nearly all our insects with a similar distribution have a Scan- 

 dinavian origin. 



Stephens, J. F. ... lllus. Brit. Kiit., Ilanst., 1831, vol. iii., p. 229. 



Pkout, L. B. ... /vH^ /?cr., 1908, vol. XX., p. 143. 



,, ... 7Vrn;.s. City of L.ond. l-^nt. and Xat. Ilist.Snr., 



1908, vol. xviii., p. 52. 



Explanation of Plates. 



Plate VII. 



Figs. 1 <Sc 2. Dijsstroma coiicimiata from Achil Island. 



,, 3 A- 4. ,, ,, from Arran Island. 



(Fig. 3 unusually pale). 

 ,, 5 & 6. D. citrata {immniifita) var. pytlionissntii from Shetlands. 



,, 7. IK truticatii from Tongue. 



,, 8. J), citrata var. piithoninsata (underside). 



,, •.), 10 (V 11. Underside hindwings of I), coiidnmita, pale, average and 



melanic. respectively. 

 ,, 12. Upperside hindwing of D. coiicinnata. 



,, 13. Underside hindwing of D. truucata (Kannoch). 



,, 11. ,, ,, ,, D. c/fra^i (Aberdeenshire). 



Plate VIII. 



Male Genitalia of D. concinnata and 7). tnoicata. 



Plate IX. 



Male Genitalia of D. citrata {itiniuniata). 



N.B. — The AedcL'agus is somewhat hent in I), citrata, and all are taken with 

 r<iiial magnification. 



