342 DRAGONFLIES OF NORTH AMERICA 
tudinal stripe on each side of 2, connected with a subapical dorsal band to form 
a U-shaped mark, also an apical ring on 2; apical third or more of 3-7; sides of 
8-9; and sides and part of the dorsum of 10. The color pattern of the abdomen 
is very hard to make out in dried specimens. Superior appendages long, bifid 
and with no tubercle. 
The female is like the male, only the abdomen has broad metallic greenish- 
black stripes covering the entire dorsum of segments 2-7; 8 pale, 9 black with 
two large apical pale spots; 10 black. 
73. ZONIAGRION Kennedy 
These are slender dragonflies similar to the blue members of the 
preceding genus, with vein M; arising near the sixth post nodal cross 
vein in the fore wing and the fifth in the hind wing. Wings stalked to a 
distance before the anal crossing about equal to the length of that cross 
vein. Female with a large ventral spine on 8; male with the apex of 
segment 10 cleft and slightly elevated. 
The nymph (Kennedy 717, p. 493) is similar to that of Enallagma but 
the gills are acuminately pointed and the six pigmented cross bands are 
more or less confluent toward the base and interrupted toward the apex 
of the gill plate. Lateral setae 5; mentals 3-4 each side. 
344. Zoniagrion exclamationis Selys 
Selys ’76, p. 125: Mtk. Cat. p. 65: Kndy. ’17, p. 488. 
Length 36 mm. Expanse 44 mm. Calif. 
Face greenish blue with blackish basal suture to the labrum. Top of head 
black with pure blue postocular spots and a wavy line of blue between them 
Front of thorax black with a pair of broad isolated stripes of blue interrupted 
in the male near the upper end (whence the specific name). Sides blue with 
blackish edgings above and below, with a line on the third lateral suture. Legs 
black. Wings hyaline, stigma black. Abdomen black with blue and brown 
markings. Segment 1 blue above; 2 black, with a large quadrangular blue basal 
spot; 3-6 mostly black; 7-10 blue above, covering 8 and portions of adjacent 
segments. Lateral inferior pale stripe extends the length of the abdomen. 
Appendages black. 
74. IscuNuraA Charpentier 
Fork-tails 
By C. Francis Byers 
The genus Ischnura is world wide in its distribution, and is repre- 
sented in North America by 15 species. 
The adults are the first damselflies to appear in the spring and they 
persist until late autumn. They are to be found, sometimes in countless 
numbers, in all aquatic situations where there is an abundance of 
