70 CLARK — THIRTY-THREE NEW SPHINGIDAE [ Vol'^VIH* 



Clark, received from my friend, Dr. Eric Mjoberg, and named for him. 

 One female from Hainan, from the collection of Geheimrat A. Huwe. 



Dr. Karl Jordan says of this form, which he was kind enough 

 to examine at my request, "between acuta and rubetra." 



Third segment of palpus triangular, as in R. acuta Walker, and R. 

 rubetra R. and J. Centre of head and thorax, and markings of upper side 

 of fore wing, nearly as dark as in R. rubetra. Under side of wings and sides 

 of breast ferruginous as in R. rubetra; less irrorated with black than in R. 

 acuta. Under side of abdomen faintly pink. 



Fore wing above: Similar to R. acuta. Distal margin more convex 

 toward wing apex. Markings faint, except for a dark submarginal area 

 like that of R. rubetra, between Rl and R3, and 3 mm. distant from distal 

 margin. The three subbasal line? of R. rubetra are lacking. The posterior 

 half of the wing is lighter in color than in R. acuta, this being especially 

 marked in the male. Hind wing above, similar to R. acuta. 



The five following new forms were taken by Messrs. C. F. and 

 J. Pratt in southwestern Sumatra during the summer of 1921, 

 and were given to me by my friend, Mr. J. J. Joicey. They are 

 of unusual interest. 



Oxyambulyx joiceyi sp. nov. 



Al. ant. long., d", 50-53 mm. Al. ant. lat., d", 18-19 mm. Marg. ext., 

 d\ 29-31 mm. 



Habitat. — Southwestern Sumatra, July-September, 1921. C. F. and J. 

 Pratt. Two males in coll. B. Preston Clark, one taken on the slopes of 

 Mt. Korintji, 7300 ft., August-September. The other taken in North 

 Korintji Valley, 5000 ft., September-October. The former is the type. 

 There are other specimens in the Hill Museum, Witley, Surrey, England. 



In general appearance this species is closer to Oxyambulyx 

 placida Moore than to any other of the genus. It is darker in 

 general tone. 



Abdominal mesial line distinct; mesial patch on eighth tergite; two 

 side dots on sixth tergite. 



