184 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



Abdomen: marked with blue and yellow; only the median 

 dorsal spots are yellow, the rest are blue; segment 10 with a 

 prominent tubercle on dorso-meson; anal appendages (Fig. 29) 

 dark brown, the superiors in dorsal view with gently curved 

 lateral margins, the mesal margins nearly parallel to the lateral 

 margins on the distal two-thirds, the margins bent laterad, and 

 the appendage contracted in the basal third; in lateral view the 

 dorsal carina of the superiors becomes more prominent on the 

 distal fourth of the appendage and has 5 or 6 indefinite denticles ; 

 tips of superiors acute, bent ventrad ; inferior appendage about 

 three-fifths as long as the superiors and with two upcurved spines 

 on the blunt apex. 



Female. — Most of the blue color pattern of the male usually 

 replaced by green but there is considerable variation; the dorsal 

 mesepisternal pale stripes are less definite than in the male ; wings 

 sometimes flavescent; superior anal (Fig. 29) appendages bluntly 

 pointed, the margins gently arcuate. 



Fig. 29. Aeshna canadensis, anal 

 appendages and color pattern of 

 thorax. (From Howe.) 



Measurements -.^^ total length, male 69, female 67 mm. ; length 

 of abdomen, male 46-51, female 45-49 mm.; length of hind 

 wings, male 43, female 42-47 mm.; width of hind wings, male 

 13-14, female 13-14 mm.; length of stigma, male 3-3.5, female 

 3.7-4.3 mm. 



Connecticut.— Litchfield, 22 August, 1915 (L. B. W.). 



New England. — June 22-September 26. 



Aeshna clepsydra Say 



Journal of the Academy of Natural Sciences of Philadelphia, 8:12: 1839. 



Nymph. — Color brown with distinct longitudinal pale stripes. 



Head: mentum about three-fifths as wide at base as at apex; 

 basal segment of the palpi forming a broadly curved hook, not at 

 all truncate; caudo-lateral margins of the head broadly rounded. 



» Walker, E. M., North American Dragonflies of the Genus Aeshna, p. 141. 



