48 DRAGONFLIES OF OHIO. 



Ischnura verticalis, Say. 



Length: of abdomen cT 20, 9 21; of hind wing o 71 

 13, 9 15. 



These measurements are averages of a series, but 

 individuals are found which are much larger and others 

 that are smaller. 



The male is green, bronze, black and blue. The top 

 of head, post clypeus, base of labrum and antennae are 

 black, the rest green including the round occipital 

 spots ; prothorax black with anterior edge and sides 

 green ; dorsum of thorax black with narrow green 

 stripes each side (sometimes interrupted as in N. posita) 

 the rest green, legs greenish with black stripes on 

 femora and tibiae, tarsi and claws ringed with brown ; 

 pterostigma of fore wings brown, hind wings light 

 yellow. The abdomen is green below and on sides ex- 

 tending as interrupted basal rings on 2-7 ; the dorsum 

 of 1-7 and 10 are otherwise black ; 8 and 9 are blue 

 with a lateral half band on each black. The posterior 

 dorsal edge of 10 has a bifid upturned process ; the 

 superior appendages are black above, depressed, turned 

 downards and inwards, expanded apically, the angles 

 rounded especially the inner ; the inferiors are longer, 

 light below, black above, curved inwards ; in profile 

 they are bifid, the upper branch short and erect, the 

 lower slender straight. 



The females are of two forms ( a ) black and green 

 ( pruinose) ( b ) orange and bronze black. 



(b) Top of head, postclypeus, base of labrum black, 

 anteclypeus greenish, rear of head orange including the 

 large connected ovate occipital spots which are con- 

 fluent below with orange of rear of head. Thorax as in 

 male, bright orange taking the place of green. Legs 

 yellow with narrow stripes on tibise, and rings on tarsi 

 and claws black. The 1 and 2 are all orange except 

 more or less of an apical ring, 3 orange except a narrow 

 dorsal band on posterior two thirds. All the others 



