74 CLARK — THIRTY-THREE NEW SPHINGIDAE [yS". VIII* 



black line bordering the light-colored distal marginal band. Very notice- 

 able are the shape and relative location of the two silvery spots on the upper 

 side of the fore wing. The dot nearer the costal margin is circular, as in 

 N. didyma. The posterior one, however, is on a line drawn vertically from 

 the costal margin through the circular spot, instead of being located more 

 distally, as in N. didyma. The shape of this second spot is roughly triangu- 

 lar, with its base on R3, instead of semilunar as in N. didyma. 



Fore wing beneath : The postmedian and the submarginal lines approach 

 so closely to R2 as nearly to touch, the space between the two lines being 

 thus practically a double triangle, with apices on R3. In N. didyma these 

 two lines are parallel from Rl to the hinder margin. 



Hind wing above : Darker in tone than in N. didyma, shading to black 

 throughout the distal half of the wing. 



The black transverse bands on the abdominal tergites are prominent, 

 as are a series of black lateral abdominal dots on sternites 3 to 7. 



Cechenena pollux Boisd., ab. rubrescens forma nova 



A single specimen (a male) of this species in the collection of 



B. Preston Clark varies so distinctly from the rest of a long 

 series that it deserves mention. It was taken on the slopes of 

 Mt. Korintji, in southwestern Sumatra, August-September, 

 1921, by C. F. and J. Pratt. The normal green color of this 

 species is replaced throughout by reddish brown. The line on 

 the upper side of the fore wing, extending from wing apex to 

 the median point of the inner margin, is broader than in typical 



C. pollux. There is greater contrast in color between the trans- 

 verse lines of the fore wing above, as a whole, and the remainder 

 of the wing. It may be that C. pollux shares, but more rarely, 

 the tendency of Xylophanes amadis Stoll in Cramer, which 

 varies normally from green to reddish brown. 



The two following new forms were received in exchange from 

 the Bureau of Science, Manila, Philippine Islands. Both are 

 remarkable, and Xylophanes transpacifica marks a new link in 

 this family between the Orient and the Occident. 



