350 Mr. A. G. Butler on new Species of 



One insect in Mr. Pryer's collection I was much surprised 

 to find, upon examination, to be absolutely identical with a 

 West-Indian form ; I allude to Gonitis fractifera. As the 

 Indian species of Gonitis seem to be constant to locality, the 

 various forms being nearly allied and limited in their range, 

 it is very strange to find a form common to St. Domingo and 

 Jamaica in Japan. 



Sphingidae. 

 1. Acosmeryx metanaga, n. sp. (no. 217). 



J . Rather larger than A . sertceus $ ; coloration inter- 

 mediate between it and A. anceus ; markings of primaries and 

 entire coloration and marking of the under surface almost as 

 in A. naga — lilacine grey, clouded and banded with fuligi- 

 nous brown ; wings tinted upon the disk with ferruginous ; 

 primaries with a lunated belt dividing off the basicostal area 

 and an oblique darker belt from the costajust beyond the 

 middle to the external border, both fuliginous brown ; the 

 usual transverse undulated dark brown lines ; outer border 

 smoky brown, undulated internally, intersected by a grey 

 stripe from the subcostal furca to the second median branch ; 

 a triangular subapical marginal dark-brown spot ; secondaries 

 greyish, becoming reddish on the disk, which is crossed from 

 near anal angle by a dusky bordered lilacine streak, followed 

 by a rather broad fuliginous outer border, which tapers to the 

 anal angle ; thorax, excepting the tegulse, red-brown ; margins 

 of abdominal segments red-brown ; antennas sordid white. 

 Expanse of wings 4 inches. 



2. Pergesa mongoliana, var., Butl. (no. 219). 



Differs from the ordinary Japanese examples in its much 

 deeper coloration above, the absence of the pale patches at 

 apex and on the disk of the primaries, and in the bright red- 

 dish coloration of the under surface. In this last character, 

 however, it agrees with the type from Mongolia. 



3. Triptogon sperchius, Menetr. (no. 205). 



We have received a pair of what appears to be this species, 

 agreeing fairly with the published figures, and therefore 

 establishing the entire distinctness of my T. piceipennis. 

 Although I could not hesitate to describe an insect so entirely 

 distinct in coloration and marking as T. piceipennis from the 

 figure published by Menetries, it is satisfactory to be able to 

 confirm the validity of the species by comparison with actual 

 specimens. 



