AGRIADES CORIDON. 25 



larger proportion to be of this form, whilst Grand observes (Ent. 

 Zeits. Guben, ii., p. 87) that the species is very common 

 at Samobor, scarcer at Podsused, the black border generally very 

 broad, the $ s at the first-mentioned locality often of the ab. niarginata, 

 Tutt, with a remarkably strongly developed row of marginal spots on 

 the hindwings. Bartel records (Ent. Zeits. Guben, xviii., p. 115) this 

 form from Eakovica in Upper Carinthia, July 23rd, 1896, by Hafner, 

 and correctly refers Oberthiir's fig. 32 hereto. We have some excellent 

 examples from Igman, and there are others labelled " Bosnia — Buerda 

 (Nicholl)" in the British Museum coll., but the finest examples that 

 have come under our notice are those in the British Museum coll., 

 labelled " Mutzell coll., Germany." They are, on the whole, of large 

 size, varying from 44mm. to 42mm., and one supposes are identical 

 with those that Dadd states are racial in the Berlin district, and 

 recently described (Berl. Ent. Zeits., liv., p. 36) under the name 

 borussia. -Weir observes (Ent., xx., p. 265) that, near Aussig in 

 Bohemia, the species occurs among the darkest trap rocks, 

 that the $ s are larger and darker than the English, the outer third 

 of the forewings more suffused with black. South observes (Ent., xx., 

 p. 49) that the Magdeburg $ s have exceedingly broad black marginal 

 borders, the costa also broadly streaked with blackish, and Leonhardt 

 records (Ins. Borse, xxii., p. 124) the same form from Oppeln in Upper 

 Silesia. It appears to be the seminigra of Preissecker, who diagnoses 

 it (Verh. z.-b. Ges. Wien, lvii, p. 87) as " Alis anterioribus margine 

 exteriore (fere) usque ad finem celluke nigro," from two $ s taken 

 at Wippach, in southwest Carniola, on August 5th, 1905 ; and 

 states that tbere is another in the " Hofmuseum," taken on Sep- 

 tember 3rd, 1892, on the Hochlantsch near Frohnleiten in Styria. 

 It appears also to be Schultz' nigricostalis, which he describes (Jahresb. 

 Wien. Ent. Yer., xvi., p. 76) as having the costal area coloured black 

 as far as the middle, the dark margin of the hindwing being also 

 broadly shaded with black. He further records (op. cit.) another $ 

 with the marginal border so broad that the blue is confined to the 

 basal half of the wing. Pfitzner notes (Iris Dresd., 1901, p. 94) the 

 capture of a £ at Nonnenbusch, in Silesia, with the marginal fascia 

 of the forewings extended over the greater part of the wings, more com- 

 pletely on the right than on the left side, the silvery-grey colour only 

 being preserved as a weak dusting of scales ; a somewhat similar $ is 

 figured by Mosley (IS at. Journal, 1896, pi. iv., fig. 6) from the " Webb 

 coll." This form, in which the band so largely overspreads the wings, 

 must not be confounded with ab. sutfusa, which is the result of a mere 

 uniform darkening of the ground colour. These extreme forms, 

 in which the margin extends beyond the discoidal cell and 

 middle of the wing towards the base, might well be grouped as ab. 

 melaina, n. ab. Dadd's observations of this marginata form under the 

 name of borussia, as it occurs in the Berlin district and at Osterode in 

 East Prussia, read (Berl. Ent. Zeit., liv., p. 36) as follows : — 



The j s are decidedly larger than the type ; the black border decidedly broader, 

 taking up almost a third of the wing, so that the insect has a darker appearance, 

 though the blue is quite like that of the type ; the ? s do not differ from the type 

 on the upperside, but the underside of both sexes of borussia is distinctly darker 

 than that of the type, that of the j s somewhat brown, of the $ s dark brown. 

 Even when typical coridon have a brown underside the darker coloration of. 



