THE ENTOMOLOGIST 



Vol. XLL] AUGUST, 1908. 



[No. 543 



DESCEIPTION OF A NEW FORM OF ZYG^NA 

 FROM ALGERIA. 



By the Hon. Waltee Rothschild, Ph.D. 



Zygtena lavandulce nisseni, subspec. nov. 

 I HAVE much pleasure in naming this new form after the 

 genial Danish Consul in Algiers, Dr. Nissen, who first suggested 

 our visit to Hammam R'Irha. 



Differs from Z. lavandulce lavandulcB at first sight by the much 

 broader and rounder fore wing, and by the total absence of any red 

 on the upper side of the hind wing. The metallic gloss of the fore 

 wnig above in the male has much less blue, and in the female appears 

 more silky. Z. I. mssenl also differs strongly from Z. I. lavandulce 

 m the spots on the upper side of the fore wing. The two basal 

 spots are much larger, the discal spot nearest the costa is as large or 

 larger, while the lower discal spot is reduced to a black dot with a 

 tmy red centre in most specimens, but entirely black in some The 

 apical spot is enlarged to quite double the size of that in the nymo- 

 typical form, and is concave on its inner side. On the under side the 

 fore wmgs have the base largely red, but the lower discal spot is 

 entirely absent ; the bind wmgs in most cases have a basal red streak 

 along the costa, and a minute red dot towards the apex, though in 

 one male the red is absent below as weh as above. 



Hab. Hammam R'Irha, North Algeria. 



This fine new form was discovered by Dr. Karl Jordan on 

 May 26th of this year, numerous specimens sitting on thistle- 

 blooms along the edge of a wood. 



BNTOM. AUGUST, 1908. 



