164 BRITISH BUTTERFLIES. 



and four supernumerary dots — two between the discoidal lunule and 

 submedian series, and two between the two parts of the semiarcuata 

 mark. In Radnor's coll. is an almost similar $ , taken at Colchester, 

 of combined crassipuncta, semiarcuata and excessa forms ( = &b. combinata) . 

 On the underside of the left forewing of this example are three small 

 extra ocellated spots between the discoidal and submedian series, three 

 similar ones, but fainter, on the right forewing, another between the 

 base of the discoidal and the spots forming the semiarcuata mark. 



t. ab. transiens [, Obth., "Etudes," etc., xx., p. 23, expl. pi. iv., fig. 42 

 (1896)] . Icarus ab., Turner, " Ent. Kec," vii., p. 95 (1895); " Proc. Sth. Lond. 

 Ent. Soc," 1895, p 50 (1896); Wheeler, " Ent. Bee," xii., p. 5 (1900). Striata, 

 Wheeler, " Butts. Switz.," p. 36 in part (1903). — Sometimes this species varies in 

 the very considerable development of the black spots, especially in the forewings, 

 thus forming a transition to the subtusradiata form (Oberthiir). 



If it be argued that Oberthiir does not really describe this form as 

 ab. transiens, we are willing to become responsible for it. This is 

 really an advance on ab. crassipuncta, in which the submedian (and 

 sometimes basal) spots are no longer round, but assume a long oval or 

 pyriform, or cuneiform shape, pointing towards the discoidal. 

 Oberthur's figure, which he describes as "ab. transiens ad ab. radiatam," 

 is made from a specimen that came from Cancale, and shows no exten- 

 sion in the spots of the hindwing except the first submedian, although 

 all the spots in the submedian and basal series of the forewings are 

 extended. Blachier notes one from near Geneva. Turner notes (Ent. 

 Rec, vii., p. 95) a specimen taken at Clandon in 1895, in which the sub- 

 median row of spots on the underside of the forewings is prolonged into 

 dashes. Wheeler mentions (Ent. Rec, xii., p. 5) a $ with the sub- 

 median series of spots prolonged into a series of dashes, taken at 

 Veytaux, July 1st, 1899. 



v. ab. postico-extensa, n. ab. — The submedian row of spots (sometimes also the 

 basal) of the hindwings elongated into oval, pyriform, or cuneiform streaks, the 

 spotting of the forewings normal. 



Just as ab. transiens is really the antico- externa form of this species, 

 with the submedian spots of the forewings only elongated, so this has 

 only the submedian spots of the hindwings similarly elongated. 



0. ab. obsoleta-posticoextensa, n. ab. Lacon, Humph, and Westd., "Brit. 

 Butts.," p. 108 (1841). — The submedian and basal spots of the forewings absent ; 

 the submedian ones (on the hindwings) developed into a series of black wedge- 

 shaped spots. 



This must be a very rare form ; we have never seen an example 



agreeing with Humphreys' and Westwood's description. 



X- ab. externa, n. ab. Alexis ab., Mosl., " Illus. Vars. Brit. Lep.," pb. vii., 

 pi, iii., fig. 5 (1880); Neave, "Ent.," xviii., p. 328 (1885); Mosl., "Nat. Journ.," 

 pi. iii., fig. 16 (1896). Icarus ab., Smith, "Proc. Sth. Lond. Ent. Soc," 1887, 

 p. 94 (1888); Adkin, " Proc. Sth. Lond. Ent. Soc," 1890-1, p. 126 (1892); Pickett, 

 " Ent. Rec," xv., p. 271 (1903); Joy, " Ent.," xxxvi., p. 30 (1903); Courv., " Mitt. 

 Schw. Ent. Gesell.," xi., p. 19, pi. ii., fig. 26 (1903). Striata, Wheel., "Butts. 

 Switz.," p. 36. in part (1903). — The elongation of the submedian row of spots 

 (sometimes also the basal) into long oval, pyriform or cuneate streaks on both 

 fore- and hindwings. 



This aberration appears to have been first figured by Mosle}^, in whose 

 specimen the spots of the submedian row of both fore- and hindwings, 

 as well as the basal spots, are extended into streaks without touching 

 one another. It was captured at Fleetwood, August, 1874, and was 

 sold with the Robson coll. Neave describes a J taken on Brighton 

 Downs, in 1885, in which the usual spots of the underside are replaced 



