204 BRITISH BUTTERFLIES. 



obsolete, on hindwings ; internenral marginal spots replace usual band ; underside 

 bluish-grey, spots clearly denned. ? , dark fuscous, often tinged with blue, orange 

 marginal lunules on hindwings poorly developed, on forewings usually obsolete ; 

 underside pale brownish, with well-defined spots, and whitish submarginal border. 



This is the form that we rioted (British Butterflies, p. 183) as 

 "occurring near Dover and in other chalky districts, the ground colour of 

 the $ s much paler in tint than those from heathy localities, and 

 the dark margin practically obsolete." It is the. common form found 

 on the open downs of southern England, and has a wide distribution 

 on the Continent. It is most closely allied to aegiades, Gerh. (antea 

 p. 192), but has well- developed metallic kernels on the underside of 

 the hind wing, and is also very similar in its general characters to the 

 specimens of var. orientalis in the British Museum coll. (antea pp. 

 192-193). 



Pathological examples. — The presence of pallid patches on the 

 wings, otherwise well-scaled, indicating failure of scaling or pigment, 

 or both, in limited areas, is of frequent occurrence in this species, but 

 very few appear to have been described. The following are a tew 

 examples that have been described or otherwise come under our 

 notice : — 



a. c? • — The left pair of wings well-developed as to size, and matching the 

 right pair in this respect, but both left fore- and hindwing with a largish pallid 

 whitish discal patch. Corsica, July 1906 (Tutt coll.). 



(3. j . — The left forewing with the space between the discoidal and apex, and 

 the left hindwing just inside the dark margin, each with a pallid, unpigmented 

 patch, the right forewing with a snow-white fold on the middle of the costa, 

 making a slightly concave hollow. St. Michel de Maurienne, July 30th, 1896 

 (Tutt coll.). 



y. 3 . — The whole of the hindwings from the marginal border to the base, 

 pale, most markedly unpigmented nearest the border ; on each of the forewings 

 a pallid patch between the margin and the discal lunule, similar to those 

 on the hindwings. [The specimen has somewhat the appearance of some pale 

 ? s of the tropical forms of Celastrina argiohis.] Captured at Dover, July 1898 

 (Tutt coll.)=ab. pallida. 



8. cf .■ — Very pale in colour, almost mauve. Captured at Dover, 1887 {Ent., 

 xxi., p. 133) (Webb coll.). 



e. J . — The left forewing with a large spot of vague outline, of a greyish-white 

 colour, occupying all the subapical area, and leaving intact the black margin, and, 

 on the left hindwing, a spot of the same colour which occupies a space equivalent 

 to a quarter between the discoidal cell and the black margin. Captured at Binn, 

 in the Valais (Blachier coll.). 



i". j .— The forewings, from the base to about one-third along the costal 

 margin, and inner margin normal ; from here the colour is of a pale bluish-grey, 

 somewhat the colour of Agriades coridon, only paler ; the hindwings are much the 

 same as the forewings, but the seven crescentic marginal spots show on the upper- 

 side very distinctly as in the ? ; on the underside the spots are mostly very 

 indistinct, especially on the forewings. Captured at G addon Down near Cullompton 

 (Angus, Kill. Bee, \iv., p. 247). 



yj. 9 . — Fully scaled, but with the usual brown wing-pigment absent from a 

 apace triangular in shape on all the wings; on the forewings the base of the 

 triangle extends from the anterior angle, to the 3rd median nervule, and the aped 

 reaches to the discoidal spot ; within this space all the usual orange marks are 

 absent. On the hindwings the base of the triangle extends from the second 

 median nervule to the second Bubcostal nervule, and the apex of the triangle 

 reaches the discoidal spot. Captured at Dunyeates Hill, near Poole, June L893 

 (Curtis /','n/., xxxi., p. Ob). 



6. ? .- - The tips of all the wings bleached (Webb, Ent ., xxi.. p. 133). 



i. ? . -The upper surface of all the wings of a pale fulvous-tawny, the exact 

 colour of that of Hipparehia pamphiluB. In Hatcnett's coll. (Stephens, Ulun. 

 fhiiist., i., p. 94) ab. fulv68cen8, n. ab. 



