10 BRITISH LEPIDOPTERA. 



y. Bred early in August. 1882. The right antenna male, strongly pectinated, 

 the left female, quite plain. Wings on right side male, smaller and little lighter, with 

 outer marginal band less distinct than in the majority of specimens. On the upper 

 side the body is equally divided, lighter on the male side than on the other ; on the 

 underside of the body the difference in colour is more distinct, on the male side light 

 buff, on the female side deep chocolate, the line dividing the two colours being dis 

 tinct, so that the insect has the appearance of two specimens cut in two, viz., the right- 

 hand side of a male joined to the lefthand side of a female. The extremity of abdomen 

 looks peculiar with tufted tail of male on right, and rounded anal extremity of female 

 on left, from Crosby (Fraser, Entom. Mo. Mag., 1882, p. 1 11). 



d. A male specimen in antennae, wings and coloration, but with a female body, 

 pressure of which caused the extrusion of two or three imperfectly developed eggs 

 (Webb, Entom. Mo. Mag., xxxiv., p. 20). 



We have seen Webb's example and noted it as being in appearance 

 a yellow male with (for this sex) abnormally large abdomen, now 

 collapsed. 



£ — £. Two examples both with the left half ? and the right half 3 . In coll. 

 Staudinger. Stdgr. in litt. (Schultz, Illiis. Wochenschrift fur Entomologie, if, p. 413). 



1]. A hermaphrodite of P. trifolii was exhibited at the exhibition of the Ento- 

 mological Society at Leipzig, in 1894 (Heyne, Insekten-Borse, 1894, p. 167). 



0. Right s , left ? . Antenna on the right side s , strongly pectinated, left ? . 

 Wings on right side smaller and lighter than on left. Body divided on the upper 

 side, the <? side lighter than the female side of the body, the colour difference is 

 very distinct, the right side being a light chamois, the left a deep chocolate, with a 

 distinct dividing-line. Abdomen on the right side 3 in form, on left rounded like ? . 

 Bred in August, 1882 (Schultz, ILlus. Zeits. fur Ent., hi., p. 168). 



1. Completely halved; antenna?, wings and body on the left ? , right $ . From 

 Nordhausen. In coll. Fr. Philipps, Cologne (in litt J (Schultz, lllus. Zeits. fur 

 Ent., hi., p. 168). 



Variation. — This is probably one of the most variable species in 

 the whole Lachneid superfamily, forming distinct races in almost every 

 locality, and varying to every shade of colour between the palest straw- 

 yellow and the deepest red-brown. The intermediate stages are so 

 exceedingly numerous that one might almost say the species was 

 polymorphic, yet each district has a sort of average form, which is 

 usually easily recognisable. Strangely enough, we have two very- 

 distinct races in Britain: (1) The ordinary dark red-brown form charac- 

 teristic of the central European races. (2) A distinct yellow race closely 

 approximating to the [? extreme southern (Lambessa) and] eastern (Russia 

 and Asia Minor) forms. The former appears to be the general type 

 from the coasts of Lancashire, Cheshire, Devon, and the heaths of 

 the New Forest, whilst the latter appears to be confined to the Kent 

 and Sussex coasts, between Dungeness and Beachy Head, more 

 particularly on the shores of Romney Marsh, about Rye and Lydd, 

 One can only, with such a species as this, give some general tabulation 

 of the aberrations and local races that have been noted, and in each 

 group it must be understood that intermediates intergrade with the 

 more extreme forms. Those we have observed in the British races 

 work out as follows : 



( rROUND COLOUR PALE YK.I.I OW. 



i. All the wings unicolorous yellow ot yeilow-ochreous, absolutely without 

 any markings=ab. obsoleta-fiava t n. ab. 



2. Pale yellow or whitish -ochreous, with the transverse lino including 

 a more or less undefined median band, the central white spot clearly defined ; 

 the hindwings grey, often with a slight pinkish tinge ; the females inclining to fawn 

 rathei than buff— pallida-jlava, n. ab. 



3. Distinct yellow males and females with two well-developed, pale-edged, 

 darker, transverse lines developing into .1 moderate band in some examples; the 

 hindwings usually with a slight reddish tinge=:ab. flava, n. ab. 



