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EE MARKS ON the VAEIATION of ZYGMNA FILIPENDULM. 



By Richard South. 



There are several forms of Zygcena filiijendulce known to 

 entomologists, and it will be convenient to refer to these in 

 the present paper in order corresponding with the amount of 

 divergence from the type. 



Var. a. (ochsenJieimeri, Zell.) — Characterised by the more decidedly blue 

 tint of the wings ; the sixth spot is intersected by a nervnle, and the upper 

 one of central pair is usually smaller than its fellow ; the hind wing has a 

 fairly broad border. 



This variety was first noticed in Britain by Mr. C. J. Boden, 

 who records it as occurring in the metropolitan district during 

 the month of May. I have taken examples at Folkestone, at the 

 end of July, which have the sixth spot intersected, but the colour 

 does not quite agree with typical ochsenheimeri. 



Var. b. — The two outer spots confluent. 



Not an uncommon form at Folkestone and Ventnor, and 

 probably elsewhere. 



Var. c. — The middle pair of spots confluent. 



Less common at Folkestone and Ventnor than var. b. 



Var. d. {cytisi, Hiibn.) — Each pair of spots confluent, forming transverse 

 bars. 



Probably not an uncommon form in some localities ; but I 

 have only met with two examples, which were detected among 

 some hundreds of specimens of Z. JilipejidulcB on Folkestone Hill, 

 during the last week of July and the first week of August, 1885. 



Var. e. {ramhtirii, Ld.) — Spots confluent, as in var. cytisi, but they are 

 dull scarlet in colour, as also are the hind wings. 



I took a specimen at Folkestone, which agrees in colour with 

 this form, but the central pair of spots are not confluent. 



Var. /. (cerinus, Eobson). — The hind wings and spots on fore wings are 

 yellow instead of red. 



This striking variety has occurred at Winchester in some 

 numbers. It has also been found in a chalk-pit, during the first 

 week of July, near Cambridge ; and there are records of its 

 capture at Birkenhead, Plymouth, Maidstone, and Finchley. 

 Mr. W. Jagger, of St. Ives, Hunts, bred a specimen of "a 

 splendid orange colour instead of red," and two others " had 

 one under wing red and the other orange " (E. M. M. vi. 117). 



Var. g. {mannii, H.-S.) — "Wings thinly scaled ; the colour of spots and 

 hind wings darker than usual. 



This is an alpine form, and, so far as I know, not represented 

 in Britain. I have specimens from Folkestone, which are very 

 barely scaled, but the spots and hind wings are pale in colour, 

 reminding one of Z. exulans var. siibocJiracea, White. 



