REVISION OF PEORIINAE AND ANERASTIINAE 11 



outer angle of cell; M2 absent; M3 stalked with Cui for at least one- 

 thii'd of its length, sometimes fused; Cui from lower outer angle; Cu2 

 from just before the angle. 



Male genitalia with uncus bearing bandlike medial process; spicate 

 processes each terminating in slender, sharply pointed ventrad and 

 caudad arms. Gnathos arms broad and flat. Vinculum well developed, 

 broadly rounded. Aedeagus somewhat flattened, three to four times as 

 long as broad; vesica, when armed, bearing one or two cornuti. 



Female genitalia with posterior and anterior apophyses of about 

 equal length, well developed. Ductus bursae moderately short. Bursa 

 unarmed. Ductus seminalis from posterior end of bursa, broadened at 

 base. 



Discussion. — The genus includes 13 known species and is the 

 largest in the American fauna of the subfamily. Affinities vary within 

 the genus, and the species have been grouped to show relationships 

 in so far as this is possible with a linear arrangement. 



There is enough variation of characters within many of the species 

 to render difficidt the construction and use of keys. To aid in the identi- 

 fication of specimens, a chart summarizing the characters found to be 

 of greatest value in separating species is included in addition to the 

 key. 



In a few cases the male genitalia are quite distinctive of the species, 

 but for the most part the differences are rather subtle. The form of 

 the gnathos, number of cornuti in the vesica, and shape of the valvae 

 (not summarized in table, see figures) are the most useful characters 

 of the male genitalia. 



Navasota hebetella may belong to Peoria and has been included in 

 the key (see Unplaced Genera and Species, p. 87). 



In accordance with the recommendation of the Code (Article 24), 

 I have chosen the name Peoria for this genus rather than the lesser 

 known Aurora which has page precedence. 



Explanation of Table 1 



1. Fore wing, vein R2 



x=free from cell 

 0= stalked with R3f4 



2. Forewing, vein M2 



x= stalked with M3 



*= fused with M3 (apparently absent) 



3. Forewing, vein Cui 



x=free from cell 

 0= stalked with M3 



4. Forewing, region anterior to cell 



x= abruptly pale, with few or no darker scales 



0= not abruptly pale, Sc and Rs sometimes white traced 



285-934—68 2 



