40 BRITISH BUTTERFLIES. 



This is a fine combination of the obsolete and striate types, and 

 must be very rare in nature. We have never seen a similar example. 



v. ab. extensa-discoidalis, n. ab. Corydon var., Mosley, " Illus. Vars. Brit. 

 Lep.," pt. vii., pi. v., fig. 4 (1880). — Mosley figures (Illus. Vars. Brit. Lep., pt. vii., 

 pi. v., fig. 4) an excellent extensa form that comes under none of the usually 

 described aberrations, in which the discoidal is divided into two parts, each form- 

 ing a long streak, a third appears below these, whilst the lower basal forms a long 

 streak. None of these elongated spots join with each other, and the submedian 

 spots on both fore- and hindwings are normal. 



0. ab. addenda, Tutt, "Ent Bee," xxi. 5 p. 300 (1909); "Proc. Ent. Soc. 

 Lond.," p. lxxx (1909). Corydon ab., South, "Ent.," xx., p. 6 r pi. i., fig. 8 

 (1887); Courv., " Mitt. Schw. Ent. Gesell.," xi., p. 23, pi. ii., fig. Id (1903).— 

 The underside presenting additional spots in usually unocellated areas. 



Specimens with additional spots in usually unocellated areas are 

 not uncommon in collections, and South has figured {Ent., xx., pi. i., 

 fig. 8) an exceptionally good example with some eleven supernumerary 

 spots on each of the forewings. As in the parallel form of A. thetis, 

 the spots are most frequently developed (1) between the outside of the 

 discoidal and spots 2, 3, and 4 of the submedian series, (2) between 

 the inside of the discoidal and the basal spots, (3) on the outside of 

 spots 2, 8, and 4 of the submedian series, and (4) between the 

 lower basal and lower submedian spots. They occur much more 

 frequently in the fore- than in the hindwings, a rather remarkable 

 fact considering that this means that they usually appear in 

 just that portion of the forewing which is covered when the 

 insect is at rest. The supernumerary spots vary in position, are 

 often asymmetrical, and not at all necessarily the same in number 

 on the opposite wings, and in their highest developed forms approach 

 closely the best striate forms, most of which are formed by the union 

 of the extra and normal spots into streaks. Gillmer notes (in litt.) 

 examples with supernumerary spots between the discoidal and the 

 submedian row, or in and close outside the latter. Reverdin notes a 

 $ , with three supernumeraries on the left and two on the right wing, 

 taken at Berisal, August 11th, 1909 ; he also notes a $ in which a 

 black streak, l*7mm. long on the left forewing, is developed between 

 the discoidal and the 3rd spot of the submedian, a similar streak, but 

 a little longer, in the same position on the right forewing, taken on 

 the Tasch-alp, August 29th, 1907 ; another with the extra top spot 

 (8th) in the submedian series, and a supernumerary between the 3rd 

 submedian and discoidal on both forewings, taken at Allevard, July 

 25th, 1909. The Rivieran (meridionalis) form is frequently subject to 

 this addenda form of aberration. Reverdin notes it also in the Pardigon 

 examples (constanti). Verity states [in litt.) that forms with accessory 

 ocellated spots are very frequent in the Florence district. 



X- ab. antico-juncta, n. ab. — A beautiful striate form, the forewings with the 

 submedian spots united in long streaks to the supernumeraries between the sub- 

 median series and the discoidal, the basal and discoidal and the lower basal, and 

 two lower submedian. There is, therefore, a series of five submedian streaks, of 

 which the 3rd is usually the longest, and one upper basal streak, all pointing to, 

 but usually not touching, the discoidal, whilst beneath, in addition, there is often 

 ;in arcuate or semiarcuate stripe with the slightest suspicion of another directly 

 below it. The spotting of the hindwing is normal. 



This is the finest developed form of the addenda series that 

 has come under our notice. In it, the origin of the streaks 

 from the normal and supernumerary dots is well exhibited. Our 



