OX Y AMB ULY X . 115 



18 a. Oxyambulyx sericeipennis sericeipennis (Butler). (Fig. 22 

 A-D, genitalia ; PL I, fig. 9, larva). 



Ambulyx sericeipennis, Butler, 1875, p. 252 (Masuri). 

 Oxyambulyx sericeipennis, Roths. & Jord., 1903, p. 195. 

 Oxyambulyx sericeipennis sericeipennis, Jordan, 1929, p. 85. 

 Oxyambulyx ciirona, Joicey & Kaye, 1917, p. 309 ; id., 1924, 

 pi. x, fig. 4 ; Seitz, 1928, p. 533. 



Imago. — <£$. 'Similar to 0. maculifera, much more grey, 

 outer margin of fore wing proportionally longer, submarginal 

 line of same wing extended to internal margin both above and 

 below. Fore wing with one subbasal spot behind cell and 

 a subbasal costal spot. Abdomen of £ with patch on eighth 

 tergite, a distinct mesial line in both sexes. Underside deep 

 -chrome. Expanse : $ 100-124 mm., 110-124 mm. 



$. Eighth tergite (fig. 22 B) of abdomen slightly bisinuate, 

 the mesial portion almost straight, not distinctly lobed, its 

 edge incrassate internally, having, in a view from the apical 

 side, the appearance of being turned dorsad. Harpe (fig. 22 C) 

 with a long finger-like distal process which points ventrad ; 

 the mesial ridge consisting of two lamella?,, irregularly dentate 

 .and distally produced into a cone, the extreme end of which is 

 turned ventrad. Penis-sheath (fig. 22 D) shaped nearly as in 

 maculifera, but there is a row of teeth dorsally and also some 

 irregular teeth ventrally ; from the sheath protrudes a blunt, 

 somewhat club-shaped " love -dagger." Tenth tergite lobed 

 mesially, the lobe rather narrow, almost truncate. Process of 

 penis-sheath of type-specimen suddenly curved ; normal in 

 a second specimen from N.W. India. 



0. Vaginal plate similar to that of maculifera, but the mesial 

 lobe longer and broader. 



Hab. W. Himalayas. We have bred it at Mussooree at an 

 elevation of about 6,000 feet, the larva feeding on Juglans 

 regia Linn, (walnut), of the family Juglandaceae. 



Egg. — Shortly ovoid ; surface smooth and shining ; colour 

 w T hen first laid pale green, turning after a few days to a beauti- 

 ful orange, and then, a day or two before hatching, to trans- 

 lucent white. 



Larva : — 



1st instar. Head round, body long and thin, horn long, 

 straight ; surface of head and body smooth and shining ; 

 colour pale yellow with the horn black. 2nd instar. Head 

 triangular, with a short process on apex of each lobe, body 

 cylindrical, long and thin, horn long and straight ; head and 

 body yellowish-green, body with transverse rows of small 

 white tubercles ; horn dark purple with small tubercles of the 

 same colour. 3rd instar. Head triangular, very large, with 

 a short process on the apex of each lobe ; segments 2 to 4 of the 

 body much less in diameter than the length of the head, the 



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