110 DRAGONFLIES OF OHIO. 



In both sexes the front is more nearly white than 

 in rubicundula. 



The species is common in all parts of the state. 

 It begins to fly in July and is most abundant in August 

 and the first part of September. 



Diplax vicina, Hagen. 



Length : ol abdomen & 21-23, 9 20-24 ; hind wing 

 c? 24-25, 9 22-25. 



Colors as in rubicundula, yellowish in teneral 

 specimens, red in fully matured specimens. Male, front 

 reddish, legs and feet brown or at least not black, 

 wings hyaline, yellowish at extreme base. 



Genital hamules small, bifid for more than half 

 their length from apex, the two branches of nearly the 

 same width at base, the anterior one longer, curved 

 and acutely pointed at apex ; the posterior one widest 

 near the middle and irregularly rounded at apex. Su- 

 perior appendages widest half-way between middle and 

 apex, before the widest point are about five inferior 

 teeth. Inferior appendage nearly four fifths as long as 

 the superiors. 



Female, vulvar lamina widest behind, distinctly 

 projecting, hind margin entire. 



Taken in all sections of the state, and appears later 

 in autumn than any other species of the genus. Taken 

 in copulation Nov. 7, at Columbus. 



Diplax semicincta, Say. 



Length: of abdomen d" 18-21, 9 17-21; hind wing o* 

 21-25. c? 20-24.5. 



Colors, yellowish in teneral specimens, red in fully 

 matured specimens. Male, front reddish to yellowish. 

 Legs at base and inferior side of front femora reddish, 

 remaining parts blackish. Basal part of front wings, 

 sometimes to triangle, sometimes to nodus yellowish ; 

 hind wings, basal half yellowish. 



