M 1923 12 ] CLARK — THIRTY-THREE NEW SPHINGIDAE 57 



2 mm. in length, perpendicular to the costal margin, one out- 

 side and two inside the cell. In I. scyron these three are re- 

 placed by a dark semicircle, open costad. In no other respect 

 does the male of I. zebra show any difference from 7. scyron, 

 either above or beneath. 



The female of 7. zebra is less irrorated with white on the veins 

 of the fore wing above than is 7. scyron, and has an irregularly 

 roundish black blotch, 2 mm. in diameter, at the apex of the 

 cell, which is lacking in 7. scyron. 



The dark marginal band of the hind wing above is much 

 broader than in 7. scyron, being 8 mm. wide between M2 and 

 SM2 and 10 mm. wide on inner margin. In 7. scyron the width 

 at these points is 5 mm. and 7 mm. The ground tone of both 

 wings beneath is darker than in 7. scyron. 



Differences between 7. zebra and 7. swainsoni and 7. leachi 

 are easier to detect. 7. swainsoni has, both in the male and in 

 the female, much more white on the fore wing above, giving it a 

 variegated appearance. 7. leachi has, both in the male and in 

 the female, more light brown on the fore wing above, giving it 

 also a variegated appearance. Both 7. swainsoni and 7. leachi 

 have a subbasal longitudinal patch, 7 mm. in length, which 7. 

 zebra lacks. 



The dark distal marginal band of the hind wing above of 7. 

 swainsoni, is broader in the male than in 7. zebra, and fully as 

 broad in the female. In 7. leachi this band is slightly narrower 

 in the male, and much narrower in the female. 



It is my hope to make a full study of the genitalia of this 

 genus, and especially of these closely allied forms. 



Polyptychus neavi Hampson (1910) and Polyptychus martha 

 Closs (1911) 



Lord Rothschild has said (Novitates Zoologicae, Vol. XXVI, 

 p. 209) " We have come to the conclusion that neavi Hampson 

 and martha Closs are synonyms of calcareus." 



