MR. A. G. BUTLER ON THE SPHINGIDZ. 587 
M. Boisduval, in a note on his S. dryas, states that this is the correct spelling of the 
name (8. dyras being a misprint); all I can say is that one of our examples of 7. silhet- 
ensis has attached to it a label bearing the name “ Sm. dyras” (sic), very legibly inscribed 
in Dr. Boisduval’s handwriting. 
All the forms of the 7. dyras group are at once distinguished from the Smerinthus 
sperchius of Ménétriés, by the shortness of their wings, the much less prominently un- 
dulated outer margin of primaries, and the entirely different disposition of the trans- 
verse lines. 
7. 'TRIPTOGON SINENSIS. 
Triptogon sinensis, Butler, P.Z.S. 1875, p. 254. no. 41. 
Hong Kong (Harrington). Type, B.M. 
8. TRIPTOGON JAVANICA. 
Triptogon javanica, Butler, P. Z.S. 1875, p. 254. no. 42. 
Java (LHorsfield). $2, B.M.;°8, coll. F. Moore. 
9. TRIPTOGON CEYLANICA. 
Triptogon ceylanica, Butler, P. Z. 8. 1875, p. 255. no. 43. 
Smerinthus dyras 3, Walker, Lep. Het. vii. p. 250. no. 13 (1856). 
Ceylon (Templeton). Type, B.M. 
10. TrrIptoGoN SILHETENSIS. 
Triptogon silhetensis, Butler, P. Z. S. 1875, p. 255. no, 44. 
3 2, Silhet, coll. F. Moore; 2 (Stainsforth). B.M. 
11. Trirrocon orteNns. (Plate XCIII. fig. 3.) 
Triptogon oriens, Butler, P.Z.S. 1875, p. 255. no. 45. 
N.E. India. Type, coll. F. Moore. 
12. TrIpToGoNn MASSURENSIS. (Plate XCIII. fig. 5.) 
Triptogon massurensis, Butler, P. Z. 8. 1875, p. 256. no. 46. 
Massuri (Hutton). Type, coll. F. Moore. 
13. Triprogon Fuscescens. (Plate XCIII. fig. 2.) 
Triptogon fuscescens, Butler, P. Z. S. 1875, p. 256. no. 47. 
Darjeeling. Type, coll. F. Moore. 
This and the six preceding forms are local representatives of 7. dyras. 
