332 GEOMETRIC. 



a 3 . Hind wing with vein 6 from 

 middle of discocellulars, which 

 are oblique. 

 a 4 . Frons with a short sharp tuft of 



hair. 



a 5 . Abdomen with dorsal tufts . . 26. EUPITHECIA, p. 398. 

 5'. Abdomen without dorsal tufts. 23. POMASIA, p. 387. 

 b*. Frons rounded and smooth. 

 a 5 . Fore wing long and narrow, 

 the apex produced ; antennae 



of male pectinate 40. STERHHA, p. 423. 



b 5 . Fore wing broad, the apex 

 not produced; antennae of 



male ciliated 33. HYDRELIA, p. 412. 



b 3 . Hind wing with vein 5 from below 

 middle of discocellulars, which 



are angled 34. VENUSIA, p. 415. 



b'. Hind tibiae with the medial or both 



pairs of spurs absent. 

 a 2 . Fore wing with vein 11 not anasto- 

 mosing with 12. 



a 3 . Palpi with the 2nd joint at least 

 twice the length of head ; abdo- 

 men very long ; male usually with 

 a lobe at base of hind wing .... 32. SAURIS, p. 408. 

 b 3 . Palpi with the 2nd joint less than 

 twice the length of head ; abdo- 

 men hardly longer than the hind 

 wing ; male with a small fold at 



base of hind wing 27. TRICHOPTERIGIA, 



6 2 . Fore wing with vein 11 anastomosing [p. 403. 



with 12 24. GYMNOSCELIS, 



c. Fore wing with veins 10 and 11 anasto- [p. 388. 



mosing with 8, 9 to form a small areole, 

 or stalked with them. 

 a'. Fore wing with vein 7 stalked with 6 ; 



hind wing with the cell normal 15. CATACLYSMS, 



6'. Fore wing with vein 7 stalked with Pp. 348 



8, 9, 10, 11. 



a 2 . Palpi porrect, more than twice the 

 length of head; the 2nd joint 



thickly haired 10. HYPENORHYNCHUS, 



6 2 . Palpi upturned and reaching vertex [p. 340. 



of nead; hind tibiae of male with 

 one pair of spurs ; hind wing with 



veins 3, 4 and 6, 7 on long stalks . . 36. POLYNESIA, p. 418. 

 c 2 . Palpi short and porrect; hind tibiae 



of male with two pairs of spurs. 

 a 8 . Fore wing with vein 6 from or 



from above angle of cell. 

 a 4 . Fore wing with the apex not 

 falcate nor the outer margin 



e xci sed 37. CAMBOGIA, p. 419. 



b 4 . Fore wing with the apex falcate, 

 the outer margin excised below 



38. HASTINA, p. 422. 



