M 1923 12 ] CLARK — THIRTY-THREE NEW SPHINGIDAE 71 



Fore wing above: Wing apex strongly produced. Subbasal semilunar 

 costal spot beyond subbasal bar, 4 mm. distant from wing base. The large 

 subbasal round patch behind cell, prominent in O. placida, is lacking in 

 the first specimen, and vestigial in the second. Distal marginal band 

 widens evenly from apex to R2, where it is 3.5 mm. wide; thence it nar- 

 rows evenly to the hinder angle. Black submarginal distal line continued 

 to hinder margin, here .5 mm. from edge of wing. A light line runs parallel 

 to the dark one, basad of it, as in 0. placida. Veins dark postmesially, 

 especially SC5, Rl and R3. 



Fore wing beneath: Distal marginal band evenly curved, as on upper 

 side. Black submarginal line prominent, and in the second specimen (that 

 from 5000 ft.) there is much extended rufous over the posterior third of the 

 wing. 



Hind wing above not dark at the base. 



Hind wing beneath. Anal area prominently gray from base to anal angle. 



Marumba sperchius sumatranus subsp. nov. 



Al. ant. long., 9 , 70 mm. Al. ant. lat., 9 , 25 mm. Marg. ext., 9 , 

 38 mm. 



Habitat. — North Korintji Valley, southwestern Sumatra, 5000 ft. 

 altitude. September-October, 1921. C. F. and J. Pratt. One female 

 (type) in coll. B. Preston Clark, received from my friend, Mr. J. J. Joicey. 



While this form is close to M. sperchius gigas Butler, from 

 northern India, it differs in several important respects. It is 

 darker-colored. 



The median abdominal line is heavier. The breadth of the fore wing 

 of M. sperchius gigas is 29 mm., so sumatranus is distinctly narrower- 

 winged. The costal margin is much less strongly curved than in gigas. 

 The distance from that point on the costal margin farthest removed from a 

 straight line drawn directly from the wing base to its apex is 5 mm., while 

 in gigas it is 8 mm. The distal margin is feebly scalloped, contrasting with 

 the strong indentations of gigas. In the fore wing above, the median line, 

 which is straight in gigas, is curved feebly distad. The hind wing above 

 is dark brown, with less of the red tone of gigas. The fore and hind wings 

 beneath are more uniformly brown than in gigas, with a slight tendency to 

 the rufous irroration of gigas. 



