462 BRITISH LEPIDOPTERA. 



sides diverge at an angle of 180 ; terminal joint nearly equal to 

 i-| X the preceding one; scales irregularly placed. In the 2 antenna 

 the scaling as in $ , except that it is undisturbed by the 

 (since non-existing) arch of hairs, the whole antenna is rather 

 more slender, and the terminal joint is rather longer, than in $ 

 and carries a brush of a few hairs. On the ventral surface, 

 each segment carries on each side a basal and a nearly median 

 bristle. On the centre of the distal margin of the ventral 



surface is a very short bristle, a short, thick baton, that is 

 more pronounced towards the antennal apex. These batons are 

 more obvious in the ? antenna, but they exist also in the $ , where 

 they are accompanied by a few short hairs (Chapman). 



Gynandromorphism. — The large number of gynandromorphous 

 examples of this species makes it impossible to hope to deal with all 

 those recorded. The following are those with which we have 

 met : 



a. The right antenna is ciliated and perceptibly larger than the other, on 

 which one can discover no sign of hairs. Along the middle of the head, thorax 

 and abdomen runs a straight line, by which the different parts of the sexes seem 

 to be divided, but on the underside of the body this stripe is not visible. The 

 wings on the right side are also more highly coloured, and agree with the colour 

 which is usual in the <$ , while the left wings have the coloration distinctive ot 

 the ? . On the underside one observes the same difference. As regards the sexual 

 parts, I have only been able to discover those of the cf , which, however, are 

 placed more to the right side than in the middle. The left side of my specimen was 

 very much shrunken, which hindered further investigation (Cramer, Pap. Exot., iv., 

 p. 230, pi. cccxcviii., fig. A). 



/3. Right side cf , left side 2 . Right side entirely J , with a strongly pectinated 

 antenna, left side 2 . The wings of the right side shorter than those of the 

 left side ; the border of the outer margin is more whitish-coloured in the indenta- 

 tions between the nervures. The markings of the wings somewhat different. The 

 abdomen on the right with longer, male down. The dividing line betweeu 

 the cf and 2 sides is median up to the last segments, where it is bent 

 over strongly towards the left side. On the underside the <J scaling does not 

 reach so far beyond the middle line as above. In the Berlin Museum. Bred by 

 Herr Ude, one of the assistants ; dissected, and described at length by Tetens 

 (Tetens, Perl. Ent. Zeits., xxxvi., pp. 457 — 464, pi. xiii., fig. 2). 



y. Right side S , left ? . Perfect gynandromorph. Coloration on the right 

 reddish-grey, with rather dark browner band, on the left light grey. Only along 

 the costa of the left forewing, exactly over the subcostal nervine, runs a stripe of dark 

 reddish-grey. The band on this half only expressed by the rather sharp outline. 

 Dividing line very sharp. Antenna on the right $ , on the left ? . Body 

 rather large. Left forewing 35mm., right 32mm. Bred by Jirak in Prague. In 

 Nickerl coll. (Nickerl, Verh. zool.-bot. Ges. VVien, 1872, pp. 728 — 729). 



d. Right side $ , left 2. Length of the somewhat shrunken hotly 12'", 

 expanse of the wings 2" 9f-"'. Dividing line distinct above and below; right side 

 of the body ash-grey ; leftside reddish-grey; right antenna strongly pectinated and 

 longer; right forewing 14^'", left 16^'". The dark bands and the waved lines on 

 the $ side strongly expressed, on the 2 side very much less strongly pronounced. 

 Berl. Mus. (King, Jahrb., i., p. 257 ; Tetens, Perl. Ent. Zeits, , xxxvi., pp. 464 

 — 466, pi. xiii., lig. 1). 



e. A second example in the Berlin Museum, mentioned but not described by 

 Tetens (Perl. Ent. Zeit., xxxvi., pp. 464 — 466). 



£. Right side cf , left 2 . Size ol thorax and abdomen as in 2 . Right 

 antenna and wings in shape and colour cf , left antenna 2 . Basal third of 

 left forewing with 2 coloration, contour and the rest of the wing £ ; right 

 anterior tibia hairy as in the cf ', underside of the wings cf (Thrupp, Trans. 

 Jin I. Soc. Loud., 1845, p. 68). 



ij. Left side cf , right 2. Left antenna, wings and body decidedly cf . the 

 right 2. The dividing line distinct. Captured near Witham, in Essex (Wing, 

 Trans. Ent. Soc. Lond., 1849, v., p. 119, pi. xiv). 



0. Left side s , right 2 . Size as in the s ■ Left antenna and wings 01 



