OX YAMBULYX . 131 



flattened neck ; 14 produced ventrad nearly to meet the 

 lower edge of base of wedge, making a transverse perforation ; 

 the cremaster suddenly narrowed to a blunt tip which is very 

 bluntly bifid ; upper surface very rugose and corrugate, 

 under surface deeply and medially channelled. Colour dark 

 chestnut ; spiracles and cremaster black. Length 50 mm. ; 

 breadth 12 mm. 



Habits. — Food-plant : Aglaia littoralis Talbot, family 

 Meliacea?. When alarmed the larva raises the front part of 

 the body and throws back the head so that the mouth-parts 

 point away from the surface on which it is lying. We have 

 only seen the moth in captivity, when it is sluggish during the 

 day. Attempts to pair the moths in captivity failed. 



25 c. Oxyambulyx substrigilis substrigilis (Westw.). (Fig. 23 

 A-D, genitalia ; fig. 26, imago). 



Sphinx (Ambulyx) substrigilis, Westwood, 1848, p. 61. pi. xxx, 



fig. 2 (<?) (Silhet). 

 Ambulyx substrigilis, Walker, 1856, p. 122 ; Moore, 1865, p. 793 



(Bengal) ; Butler, 1877 A, p. 579 ; Hampson, 1892, p. 77 (part.). 

 Oxyambulyx substrigilis substrigilis, Roths. & Jord., 1903, p. 202, 



pi. viii, fig. 2 {<$) ; Manson, 1921, p. 745 ; Seitz, 1928, p. 534. 



Imago. — <$$. A small form, resembling 0. s. aglaia, but the 

 basal patch of hind wing often pale tawny and inconspicuous. 

 as in 0. liturata. Expanse : $ 96-114 mm., £ 120 mm. 



$. Underside of body, palpi and wings, and upper side of 

 hind wing much less deep orange-fulvous than in 0. s. aglaia. 



Fig. 26. — Oxyambulyx substrigilis (Westw.), $. 



Distal process of harpe (fig. 23 B) very broad, spoon-shaped, 

 shorter than in liturata. Ventral process of harpe longer than 

 in 0. s. aglaia ; penis-sheath (fig. 23 C) stouter, apical process 

 short, blunt at end, curved ventrad. 



Hob. E. Himalayas (Sikkim ; Assam) and the Andaman 

 Islands. Early stages not known. 



k2 



