322 BRITISH BUTTERFLIES. 



Lambillion states that this form occurs here and there with the 

 type in Belgium. Wheeler (in litt.) notes an example taken by him 

 near Iselle, July 15th, 1905, and another was taken by Mrs. Nicholl, 

 in Bosnia. 



(e) pallida, le Chamb., "Ent.," xlL, p, 202 (1908).— Aberration of <? and ? of 

 a pale washed-out appearance. Not uncommon (le Chamberlain). 



This is another of the Cotswold forms. There is a specimen of le 

 Chamberlain's in the Brit. Mus.Coll. which has the costa of the hind- 

 wings of a very washed-out appearance, but we have seen no example 

 in which this occurs over the whole wings. If the pallida here 

 described are of the same kind, the colour is undoubtedly due to a 

 colour change in the blue scales and not to any admixture of white 

 scales with those of the usual tint. 



(f) var. (or ab.) ofenia, Tutt, "Ent. Bee," xxi., p. 198 (1909).— Two small 

 dull-coloured examples, the <? very thinly scaled with blue, the ? greyish, with only 

 a tinge of blue scaling towards the basal part of the inner margin (Tutt). 



Ofen Pass, August 12th, 1908. It would be interesting to know 

 if this is the ordinary form of the species in this district, as it is very 

 different from those we have captured in many places elsewhere. 



[The following ab. has lately been described. 



(77) ab. t? grisea, Courv., "Mitt. Schweiz. Ent. Gessells.," xii.., pt. 2, p. 294 

 (1913). — A j , found by Gerings near Mentone, in 1911, large, with broad black 

 border, and strongly marked with an unnsually large number of spots on the upper- 

 side, is, on this side, light grey with a very pale rosy shimmer; beneath, light 

 yellowish grey, which is characteristic of the form ligurica, Wagn. (Courvoisier). 



In this case also there must be a colour-change in the blue scales, 

 comparable only to var. amurensis, G.W.] 



(6) ab. basipuncta, n. ab. — Specimens in which one or more basal spots appear 

 on the upperside of the forewing. 



The appearance of one, or two basal spots on the upperside of the 

 forewings is by no means rare and occasionally even a third is present 

 especially when the spots of the submedian series are large and 

 elongated, in some cases the upper part of the double inner-marginal 

 spot of this series coalesces with the lower basal spot, making a 

 long black streak, almost, or quite, parallel with the inner margin. 

 For this form we give the name 



(t) ab. conjuncta, n. ab. — The lowest spot but one of the discal series joined to 

 the lower basal spot on the upperside forewing. 



The Brit. Mas. coll., among others, contains a considerable number 

 of specimens of this form ; all are $ s. 



(k) ab. imperialis, le Chamb., "Ent.," xli., p. 202 (1908).— Aberration of the 

 ? . An exceedingly fine form, generally of a brilliant blue, with the black spots 

 on the upper surface of the anterior wings elongated into pear-shaped streaks, 

 giving them the appearance of a diadem or crown (le Chamberlain). 



This form, though apparently occurring only in the 2 on the 

 Cotswolds, where it is reported as being not uncommon, occurs else- 

 where in the $ also, but more rarely. In the British Museum are 

 magnificent specimens of both sexes from the Leach coll., unfortu- 

 nately, as usual in his insects, without any indication of locality, 

 though from all appearance it would seem probable that they came 

 from the South of France, where le Chamberlain says that this form 

 is common, or from the Italian Riviera. It is by no means an unusual 

 form of the var. obscura, or rather of the form obscara-major, the 



