No. 39] ODONATA OF CONNECTICUT: COENAGRIONIDAE 6 1 



10.' Pronotum without two approximate median spots on the median 

 lobe ; tergum 8 with two pale blue spots on the caudal margin ; 

 stripe of the mesopleural suture not usually divided by brown as 



far forward as the katepisternum divagans 



Pronotum with two small pale spots on the dorso-meson ; tergum 

 8 with dorsum entirely black; stripe of the mesopleural suture 

 usually divided by brown as far forward as the katepisternum 



exsulans 



11. Eighth tergum, either largely blue or with a large blue or pale 



spot on each side 12 



Eighth tergum neither largely blue nor with a large blue or pale 

 spot on each side .' 14 



12. Seventh abdominal tergum mostly pale blue, the black confined to a 



small spot on caudal margin and mid-dorsal line aspersum 



Seventh abdominal tergum black above, pale on sides, the black 

 not confined to a small spot and mid-dorsal line 13 



13. Cephalo-mesal angles of mesostigmal lamina hollowed out (Fig. 



II, No. 11) cyathigerum 



Cephalo-mesal angles of mesostigmal lamina not hollowed out calverti 



14. Adults of small size, abdomen not over 20 mrn. ; pronotum entirely 



black ; M; arising proximad of the 4th postnodal cross-vein in 



the hind wings minusculum 



Adults of larger size, abdomen more than 20 mm. ; pronotum not 

 entirely black ; M2 distad of the 4th postnodal cross-vein in the 

 hind wing 15 



15. Mesostigmal lamina each with a diagonal ridge; black of abdom- 



inal segments 4-7 considerably reduced near the front margin, 



and often not reaching the cephalic border carunculatum 



Mesostigmal lamina without diagonal ridges ; black of abdominal 

 segments 4-7 not greatly reduced near the front margin, and 

 usually reaching the cephalic border doubledayi; civile 



Group I Vesperum-signatum Group 



Enallagma pictum Morse 



Psyche. 7: .•^07: 1895;. 



Nymph. — Unkno\^•n. 



Adult, male. — Color reddish brown or yellow and black. 



Head : reddish brown or yellow and black ; first two antennal 

 segments pale; postocular spots narrow, the lateral ends hardly 

 widened, the mesal ends connected with the postocellar stripe. 



Thorax : yellow or orange and black ; legs pale ; wings with 

 10 to II postnodal cross-veins in the front wing and about lo in 

 the hind wing; M, arising near the fifth postnodal cross-vein 

 in the front wing and between the fourth and fifth in the hind. 



Abdomen : yellow or orange and black ; black as follows : 

 dorsum of i and 2, the cephaHc half of the dorsal stripe of this 

 segment considerably narrowed; dorsum of terga 3 to 10 except 

 narrow basal rings; anal appendages as in Fig. 10, No. 26. and 

 differing from signatuni in having the superiors shorter, more 

 rounded at the tips, and without the ventral tooth of signatum. 



~ This separation of divagans and exsulans is not entirely reliable and the females 

 are so closely related that they can not be easily determined. Divagans is, however, a 

 rare species in Connecticut. 



