[219] THE ODONATA 149 



Males'. On segment i, basal spot usually quadrate, narrowed and 

 more or less rounded on sides behind, its hind margin sometimes 

 excised but usually straight or nearly so and generally with a small 

 median triangular projection ; on segment 2, transverse posterior spot : 

 in front, convex and more or less rounded, sometimes pointed medially ; 

 behind, convex, or straight, or sinuated and pointed ; sometimes 

 united with apical margin by a short stalk which varies greatly 

 in length, width and shape ; sometimes connected with an inferior 

 lateral stripe present in some specimens ; on segments 3 to 6, spots 

 more or less pointed anteriorly, widened and usually rounded pos- 

 teriorly, broadly united with apical ring ; spot on segment 3 covering 

 posterior \ to \; on 4 covering i to f ; on 5, f to f ; on 6, f to |. 

 The spot on segment 7 covers apical -| or more. Dorsum of seg- 

 ment 10 entirely black. Other irregularly placed spots are some- 

 times present. 



Females : Spot on segment i similar to that of the males ; on 2 quite 

 variable in shape and size, the narrowed portion not always reaching 

 the anterior margin, sometimes bifid ; posterior widened portion 

 rounded or angulate laterally ; connected directly, or by a short wide 

 stalk, with the apical ring. Spots on segments 3 to 7 similar to those 

 on male but longer, covering apical f or more on all of them. Spot 

 on segment 8 exceedingly variable in shape, broadly or narrowly 

 pointed anteriorly, widened behind, connected with posterior margin 

 directly or by a stalk, in one specimen not reaching posterior margin ; 

 widened portion sometimes connected with a lateral spot or stripe. 

 Spots on segments 9 and 10 covering entire dorsum, narrowing behind. 



The postocular spots (in both sexes) are large and in most specimens 

 denticulate behind as in E. annexum (Hagen), the denticulations 

 sometimes connected with the blue of rear of head. The male appen- 

 dages agree well with those of calverti as described by Morse and fig- 

 ured by Williamson. 



These variations seem to be individual rather than geographical, 

 although the males from Juneau all have very long dorsal spots on the 

 abdominal segments. 



This species, described from Nevada, has also been reported from 

 Massachusetts, Maine, Wyoming and Washington. 



Family 

 Subfamily 



^SCHNA JUNCEA (Linn.). 



Libettula juncea LINN., Syst. Nat., i, p. 544, n. 10, 1758. 

 jEschna juncea KIRBY, Synonymic Cat., p. 87, 1890. 



