23 



very near to each other at the basal third and end at the widest 

 part of the feather, one in the costa a little before the apex, and 

 the other in the outer margin behind the apex. The second 

 feather has an acute apex and a distinct anal angle ; and vein 3, 

 arising a little before the end of the cell, ends in the anal angle, 

 while 4 arises from the end of the cell and ends in the apex of this 

 feather. The third feather is narrow and tapers gradually to the 

 apex, but there is usually a slight enlargement indicating the anal 

 angle near the middle of the hind margin. A cluster of black 

 scales more or less pronounced occurs in* the fringe of the hind 

 margin. One internal vein runs through the middle of this feather 

 and a second terminates at the end of the second fissure. 



The characters of the genitalia are represented in plates V., 

 VII. and VIII. 



SYNOPSIS OF THE SPECIES. 



j J Palpi and frontal tuft much longer than head, marginidactyla. 

 f Palpi and frontal tuft not longer than head, . . . .2. 



2 ( With a dark triangle on the outer third of costa, .";.". .3. 

 c Without a dark triangle on the outer third of costa, . . 13. 



3 < Cluster of dark scales in the middle of fringe of third feather, 4. 

 c Cluster of dark scales beyond the middle, . . . . 10. 



4 < Hind tibiae white, banded with dark near middle and end, . 5. 

 i Hind tibise without these characters, . . ... 6. 



,, ^ More than half the space between spurs white, . carduidactyla. 

 \ Less than half the space between spurs white, . percnodactyla. 



g < Ground color of fore wings pale fawn, 7. 



( Ground color of fore wings whitish, 8. 



J Expanse of wings 36 mm., grandis. 



\ Expanse of wings 20 mm., . . . ..'. . fragilis. 



C Expanse of wings 30 mm.,' . * . . . albidorsella. 

 8 < Expanse of wings 20 mm., . . ... . . ... . shastce. 



^Expanse of wings 25 mm., .,..,.. . . 9. 



g J Costa black between stripes on first lobe, . . orihocarpi. 

 \ Costa not black between stripes on first lobe, . . albida. 



^Q < Fore wings reddish fuscous, 11. 



c Fore wings pale gray marked with black, * . . .12. 



. , J Markings dark brown, acantfiodactyla. 



( Markings light brown, edwardsii. 



12 \ Thorax white, pica,. 



c Thorax gray, ........ cosmodactyla,. 



.o S First lobe with two light cross lines or stripes, . . .14. 

 ( First lobe without cross lines or stripes, . . . .15. 



(Costa cinnamon brown, hind margin white, . . . albicans. 

 ... j Fore wings white shaded with brownish scales at base and 



1 costa, petrodactyla. 



^ Fore wings brownish gray, lesser adacty la. 



