507 



Female. — Color similar to that of the male. 



Head and thorax similar to those of the male except that the color 

 is paler. 



Abdomen : terga 8-9, inclusive, brown with a median buff stripe 

 and a lateral stripe on each side; tergum ten, buff; ovipositor buff, the 

 prostyles short and extending caudad of the anal appendages. 



Measurements 



Length, $ 33 mm. 



Length, 9 34 mm. 



Length of abdomen, $ 27 mm. 



Length of abdomen, 9 28 mm. 



Length of hind wings, $ 20 mm. 



Length of hind wings, 9 23 mm. 



Width of hind wings, $ . 5.0 mm. 



Width of hind wings, 9 5.5 mm. 



This species has not been reported from Illinois but has been re- 

 ported from Kentucky, and may possibly be taken in southern Illinois. 



Described from specimens in the Bolter Collection of the Uni- 

 versity of Illinois and others in the collection of Mr. E. B. William- 

 son, — all from Florida. 



Argia moesta putrida (Hagen) 



Nymph. — Color, dark brown. 



Head broad and flat, pentagonal, the caudo-lateral angles project- 

 ing caudad and possessing a few short setae ; antennal segments dark 

 except the first, which is pale ; labium very broad, the median lobe but 

 slightly narrowed at the base and projecting strongly between the labial 

 palpi ; mental setae wanting, the lateral marginal setae about twelve ; 

 labial palpi with two fixed hooks, both shorter than the sharp distal 

 segment, the one adjacent to that segment shortest ; setae of the labial 

 palpi reduced to a single weak hair-like one. 



Thorax brown; the pronotum projecting strongly laterad ; legs 

 not conspicuously banded as in apicalis, but possessing a faint preapical 

 ring and with the proximal two-thirds evenly infuscated; tibiae with 

 dark apices; tarsi mostly pale; femora with indefinite rows of short 

 heavy setae; wing-cases extending to the middle of the fourth abdom- 

 inal segment or beyond. 



Abdomen uniform brown, the lateral keels feebly developed and 

 without setae; styli of the male very long, nearly reaching the apex of 



