PAPILIO. 65 



scaling in the streaks separated by a black spot ; the transverse 

 postdiscal series of spots and the terminal series of narrow 

 lunules as on the upperside but larger ; finally, an intervening 

 transverse series of velvety-black spots between the discal and 

 postdiscal markings. Antennae, head, thorax and abdomen sooty- 

 black, a few white specks on the thorax below. 



Exp. <$ 113mm. (4-06"). 



Hob. Southern India. 



This extremely rare form is only known through the type which 

 is contained in the Zoological Museum, Tring. Through the 

 courtesy of the Honourable Walter Rothschild and Dr. Jordan 

 I have been able to describe and figure this. 



CASTOR GEOUP. 



c? $ . Fore wing : costa widely but distinctly arched, apex 

 obtuse ; termen straight, not concave or convex, slightly oblique ; 

 tornus rounded ; dorsum straight, two-thirds or more the length of 

 costa ; cell elongate, longer than half the length of the wing ; vein 8 

 from basal third of vein 7. Hind wing : costa slightly arched, apex 

 obtusely rounded, or costa and termen form one continuous bold 

 curve ; termen scalloped ; dorsum somewhat elongate, straight ; 

 abdominal fold in c? narrow ; cell moderately long ; subcostal 

 vein and upper discocellular subequal. Antennae not quite half 

 the length of the fore wing ; club slight, gradual, curved ; head, 

 thorax and abdomen moderately long, not massive. 



Key to the forms of the Castor Group. 



a. Fore wing upperside without subterminal 



white markings. 

 a'. Hind wing upperside with discal white 



markings. 



a 2 . Hind wing upperside : discal markings 

 not complete, composed of broad white 

 streaks in interspaces 4 to 7 ........ P. castor, p. 6(5. 



b-. Hind wing upperside : discal markings 

 complete, composed of elongate broad 



white spots or streaks in interspaces 1 I P. castor, race mehala, 

 to 7. ............................. | [p. 67. 



b'. Hind wing upperside without discal but 



with postdiscal white markings ........ P. mahadeva, p. 67. 



b. Fore wing upperside with a prominent subter- 



minal series of white markings .......... P. dravidarum, p. 68. 



$ $. 



a. Hind wing upperside : apex of cell with an ill- 



defined patch or streaks of white scales . . P. castor, p. 66. 



b. Hind wing upperside : cell uniform, without 



markings. 



'. White spots of subterminal series on fore ) P. castor, race mehala, 

 wing gradually larger towards costa . . } [p. 67. 



VOL. ii. r 



