60 CLARK — THIRTY-THREE NEW SPHINGIDAE [vol'.^li?' 



toward anal angle. Dark brown distal marginal band, 9 mm. in width 

 along inner margin, narrows gradually to hinder angle, where it is 3 mm. 

 in width. This band is gently convex basad. Parallel to this band, and 

 basad from it, is a narrow dark brown line, about 1 mm. distant from the 

 band. The remainder of the wing is wood-brown, with a faint transverse 

 median shade which fades away before reaching inner margin. 



Hind wing beneath: Cilia brown, tipped with white, more conspicu- 

 ously so than on upper side. Entire wing wood-brown, crossed by two 

 transverse lines; one median, slightly convex basad, the other submarginal, 

 undulate between the veins, and following the line of the edge of the distal 

 marginal band on upper side of the wing. It is thus 9 mm. distant from 

 wing tip on inner margin, and 3 mm. distant from hinder angle at that 

 point. 



A beautiful and distinguished-looking insect. 



Panacra niasana sp. nov. 



Al. ant. long., 9, 23 mm. Al. ant. lat., 9, 9 mm. Marg. ext., 9, 

 12 mm. 



Habitat. — North Nias, near Sumatra. One female (the type) in coll. 

 B. Preston Clark, received in exchange from my friend, Dr. Karl Jordan. 



This form is so close to P. malayana R. and J. as to be easily 

 confounded with it. It is, however, clearly distinct. 



Fore wing above: The entire ground tone is darker than in P. malayana, 

 giving the appearance of greater uniformity of tint. First discal line does 

 not reach costal margin. This line is more nearly parallel to the costal 

 margin than in P. malayana, being 4 mm. distant from it on the inner mar- 

 gin, and 2 mm. distant where it fades away toward the wing apex. This 

 line in P. malayana is 5 mm. distant from the costal margin on the inner 

 margin, and actually reaches this margin apically. White sagittate mark- 

 ing between SC5 and Rl is more acute in this form than in P. malayana. 

 Postdiscal lines are more distinct and more closely parallel. 



Hind wing above: Light submarginal area is less marked, entire wing 

 darker. 



Fore wing beneath : Reddish brown postmedian area is darker in tone, 

 but less irrorated with black. 



Hind wing beneath: Darker in tone. White antemedian dot more 

 prominent. 



