312 SPHINGID^E. 



stretches out the head and segments 2L and 3 and bends theni 

 downwards and backwards so that the head and anterior 

 segments lie parallel with and close to the venter of 5, which 

 segment is at the same time expanded. The anterior part of 

 the body is swayed from side to side, and the larva presents 

 a most curious aspect, which we have not noticed in any other 

 species. The larva turns greenish-brown before pupation, 

 which takes place in a rough cocoon on the surface, the hooks 

 of the cremaster being fastened firmly in a pad of silk. The 

 habits of the imago, so far as they are known, are the same as 

 that of P. mydon. There is only one brood, during the mon- 

 soon months. 



102 b. Panacra metallica metallica Butl. (Fig. 76 H, genitalia). 



Panacra metallica, Butler, 1875, p. 6 (N. India) ; Roths. & Jord.,. 



1903, p. 540 ; Seitz, 1929, p. 552, t. 64 c. 

 Chserocampa metallica, Hampson, 1892, p. 89 ; Dudgeon, 1898 y 



p. 410 (partim ; Sikkim, 4,000 ft.). 



Imago. — ^$. Like sinuata, but differs as follows : more 

 ochraceous in tint ; side-stripe of thorax and proximal seg- 

 ments of abdomen tawny ; discal lines of fore wing less 

 longitudinal, not reaching costal margin, slightly curved 

 distad between SC 5 and R 2 ; clayish-buff band of hind wing 

 broader. Underside less extended brown, basal area of fore 

 wing paler, with obvious traces of brown markings ; hind 

 wing buff tinged with tawny ; submarginal buff area broader 

 than brown marginal band, continued to costal margin, 

 more tawny in front, interrupted before RA 



$. Harpe (fig. 76 H) much shorter than in sinuata, resembling 

 that of dohertyi, but more strongly spatulate. 



Hab. E. Himalayas (Sikkim). Appears to be rare. Only 

 two specimens in the British Museum. 



103. Panacra perfecta Butl. 



Panacra perfecta, Butler, 1875, p. 391 (Darjeeling) ; id., 1881 B, 

 p. 4, pi. lxxviii, fig. 6 ; Roths. & Jord., 1903, p. 540 ; Seitz, 

 1929, p. 552, t. 56 c (6). 



Chserocampa metallica, Hampson (non Butl.), 1892, p. 89 ; Dud- 

 geon, 1898, p. 410 (Sikkim). 



Imago. — <§. Similar to metallica in colour. Fore wing : 

 sinus below apex vestigial or absent, discal lines a little more 

 longitudinal than in sinuata, the first being at hind margin 

 nearer the base than in sinuata, the three outer ones not 

 reaching SC 5 , first and second also obsolescent near costal 

 margin ; a distinct double submarginal line, parallel with 

 outer margin. Pale band of hind wing a little wider than 

 in sinuata, nearly reaching costal margin, but much obscured 



