146 



Smith and Pritchard: Odonata 



Fig. 4:76. Te/ebos/'s salva. a, dorsal view of mole obdomina 

 appendages; b, mesostigmal lamina of female (Celeste Green 



4:78; 4:79) is known only from California. This species 

 occurs in permanent pools of mud-banked streams. 



The female, unassisted by the male, inserts her 

 eggs into the leaf blades of Sparganium that hang 

 over into the water. In oviposition the female first 

 backs down into the water (in contradistinction to 

 most damselflies), and lays several or more eggs as 

 she climbs upward. A zigzag row of incisions is left 

 behind as oviposition progresses. 



The naiads are found in the roots of the Sparganium 

 clumps. 



Genus Coenagrion Kirby, 1890 



The genus is primarily Palaearctic, and it is closely 

 allied to Enallagma. The fact that only the vulvar 

 spine on segment eight of ' the female is absent and 

 that more or less distal membranous appendages are 

 present in the male indicates how closely the genera 

 are related. Adult males are similarly blue and black 

 in coloration, and females are more brownish. 



Three species of Coenagrion are found in boreal 

 North America of which one, C. resolutum (Hagen) 

 1876 (figs. 4:80; 4:81; 4:82) ranges across Canada 

 and the northern United States, south to Colorado 

 and California in the West. This species is found 

 along the reedy margins of streams and rivers. 



Genus Enallagma Charpentier, 1840 



The genus Enallagma contains the bright blue and 

 black damselflies that are commonly seen by every 

 American naturalist (figs. 4:83; 4:84; 4:85; 4:86). 

 Females are less conspicuous, because they are 

 less obviously colored. Adults abound in diverse 

 aquatic habitats, but they usually are found where 



Fig. 4:78. Zoniagrion exc/omof loni's. o, color pattern of male; 

 b, color pattern of female; c, fore wing; d, hind wing (Kennedy, 

 1917). 



there is still, shallow, fresh water with abundant 

 vegetation. Some species are found over brackish 

 water or desert alkaline pools. 



Adults fly low over the surface of the water or 

 through grasses along the shore. Rarely, they are 

 found some distance from water. Floating debris or 

 emergent vegetation commonly serves as a support on 

 which to rest. Females do not usually submerge for 

 oviposition. 



Our key to naiads indicates that Walker (1954) and 

 others are correct in showing that there are significant 

 differences among the various groups* of species of 

 which the genus Enallagma is now comprised. Kenned\ 

 (1920) proposed a generic division on the basis of 

 the structure of the intromittent organ, but he did not 

 continue these studies on a comprehensive basis. 



Fig. 4:77. Zoniagrion exclamationis, laterol view of male 

 abdominal appendages (Celeste Green). 



Fig. 4:79. Zoniagrion exclamationi s, naiad, a, lateral view; 

 b, dorsal view; c, segment 9 of female; d, lateral carina; e, 

 antenna; f,g, mentum (Kennedy, 1917). 



