17 



with a more or less prominent anal angle. Feathers of the hind 

 wing narrow and pointed, linear and without anal angles. Vein 2 

 arises from the median vein, a little before the outer end of the 

 cell, while 3 and 4 arise from a short stalk, 9 and 10 arise one 

 after the other from 8, and 11 arises near 8 from the upper angle 

 of the cell. In the hind wing the costal vein terminates near the 

 outer third of the costa ; the continuation of the subcostal runs 

 through the middle of the first feather and ends in the apex. The 

 median vein has three branches the third of which ends in the apex 

 of the second feather. The third feather with a single strong 

 vein through the middle, terminating in the apex. This feather 

 has a cluster of dark scales in the hind fringe beyond the middle. 

 The characters of the male genitalia are represented in Plate VI., 

 figs. 1-8. 



SYNOPSIS OP THE SPECIES. 



General color tawny yellow, .... periscelidactylus. 



General color light reddish brown, . . delawaricus. 



General color dull grayish brown, . . ningoris. 



General color dark brown, .... tenuidactylus. 



OXYPTILUS PERISCELIDACTYLUS. 



Pterophorus periscelidactylus Fitch, N. Y. Rep., Vol. I., p. 843 (1854). 

 Pterophorus periscelidactylus Riley, Mo. Rep., Vol. I., p. 137 (1869). 

 Pterophorus periscelidactylus Riley, Am. Ent., Vol. II., p. 234 (1870). 

 Oxyptilus periscelidactylus Zell., Ent. Zeit, Vol. XXXII., p. 178 



(1871). 



Pterophorus periscelidactylus Pack., Guide, p. 356 (1872). 

 Oxyptilus periscelidactylus Zell., Beitr., Part 2, p. 119 (1873). 

 Pterophorus periscelidactylus Saund., Can. Ent., Vol. V., p. 99 (1873). 

 Oxyptilus periscelidactylus Wlsm., Pter. Cal. and Ore., p. 25, 



PI. II., fig. 5 (1880). 



Oxyptilus periscelidactylus Saund., Ins. Inj. Veg., p. 268 (1889). 

 Oxyptilus periscelidactylus Comst, Manual, p. 238 (1895). 

 Oxyptilus periscelidactylus Smith, Econ. Ent , p. 318 (1896). 



Expanse of wings, 14 to 29 mm. Head, thorax and fore wings 

 tawny yellow. Palpi slim, porrect or ascending, reaching as high 

 as the top of the head, white touched on the outside of second and 

 third segments with tawny yellow. Antennae dark brown beneath, 

 white above and dotted with white along each side. Posterior 

 part of the thorax marked in some specimens with white on the 

 top of the tegulae, the sides and two longitudinal stripes on the top 

 of the metathorax. Abdomen tawny yellow, marked more or less 

 imperfectly with a white stripe along each side and also on each 



