No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 285 



Key to Species 



Nymphs™ 



I. Dorsal hooks well developed on abdominal segments 4 to 7, longest 

 on segment 6 and sharp ; lateral spines of the ninth segment 

 reaching the apices of the inferior appendages; lateral setae of 



the labium 8 to 10 eponina 



Dorsal hooks weakly developed on segments 5 to 7, short, but 

 pointed lateral spines of the ninth segment not extending beyond 

 the tip of the superior terminal appendage; lateral setae 7 elisa 



Adults 

 Males and Females 



1. Dark spots only on the bases of the hind wings ; i row of cells 



between Rs and Rs supplement except at margin of wing ..martha 

 Dark spots beyond the base of the hind wings and also on the 

 front wings ; 2 rows of cells between Rs and R supplement ... 2 



2. Both wings with a cross-band proximad of the stigma which 



entirely crosses the wings -y*" wings entirely suffused with yellow 



PI. XIII, Fig. I eponina 



Wings without a cross-band proximad of the stigma, at most a 

 spot between stigma and nodus which does not cross the wing; 

 wings usually clear between the dark spots 3 



3. Area between subcosta and R, proximad of the nodus, dark ; dark 



spot between nodus and stigma usually bilobed, sometimes divided 



into two spots monomelaena 



Area between subcosta and R, proximad of the nodus, clear ; dark 

 spot between nodus and stigma entire, never divided into two 

 spots, PI. XXII, b elisa 



Celithemis elisa (Hagen) 



Synopsis of the Neuroptera of North America, 182: 1861. 



Adult, male (PI. xxii, b). — Head: labium black on middle, 

 lateral lobes brown ; Jabrum, clypeus and front, except the usual 

 black line in front of the ocelli, reddish ; vertex dark brown, black 

 in front ; occiput and postgenae next to the compound eyes, 

 yellowish red. 



Thorax : prothorax uniform black ; dorsal carina much de- 

 pressed ; meso- and metathorax brown, with a black velvety stripe 

 on the carina and on mesanepisternum on contact with the suture, 

 a blotch caudo-dorsad of the spiracle and another near the wing 

 base, on the metapleural suture ; venter brown ; wings not wholly 

 flavescent, conspicuously spotted, the front wings each with a spot 

 about 1.5 mm. across, cephalad of the triangle, another twice as 

 large between nodus*^ and stigma, and a still larger one at tip of, 

 but not quite covering the apex ; base of the wing yellow and 

 cubito-anal, antenodal, and postnodal cross-veins inf uscated ; hind 



^ Needham, Aquatic Insects in the Adirondacks. Bull. N. Y. State Museum, 47: 

 514: iqoi. 



*" Sometimes interrupted, forming two spots. 



" Specimens in the collection of Dr. R. H. Howe, Jr., lack the dark spot between 

 nodus and stigma entirely. 



