No. 39] ODONATA OF CONNECTICUT: COENAGRIONIDAE 91 



Head : almost entirely black in older specimens, marked with 

 brown in younger ; postocular spots subcircular, brown or bluish ; 

 setae of labium, clypeus and front long and black or very dark; 

 genae, mandibles, occiput and postgenae, brown in tenerals, black 

 or poUinose in others. 



Thorax: pronotum uniformly dark, the caudal lamina thin, 

 unbroken, and projecting dorsad ; pleura and sterna light in color ; 

 dorsum of meso- and metathorax entirely black in older specimens, 

 the sides and venter pollinose, legs also black except the dorsal 

 surface of the tibiae ; tenerals have a pale dorsal carina flanked 

 on either side by a broad dark stripe ; mesopleura each with two 

 pale stripes, one above and one below the mesopleural suture; 

 legs mostly dark brown; front wings with 14-15 postnodal cross- 

 veins, M, arising between 6 and 8; stigma usually surmounting 

 one cell. 



Abdomen : black or very dark, segment i with dorso-apical and 

 lateral apical yellow spots ; 2 with lateral stripe and dorsal excla- 

 mation mark : all marks on first and second terga obscured with 

 pollen in older individuals ; tergum 3-5 with narrow basal ring 

 and lateral stripes; 6-8 black with basal rings only; 8 with a 

 broad lateral spot on each side at base, the two connected in some 

 individuals; terga 10 mostly dark in color; anal appendages (Fig. 

 12, Nos. 18 and 19) dark. In older specimens the abdomen 

 appears entirely black, with narrow basal rings on 3-8; anal 

 appendages black, superiors decurved, inferiors with a ventral 

 extended lobe. 



Adult, female. — Color similar to the male; postocular and 

 postocellar spots present, and the pale area of the front above 

 clypeus is divided by a dark line on the meson. 



Thorax : similar in color to the male ; the pale stripe above and 

 below the mesopleural suture much more conspicuous than in the 

 male; mesostigmal plates (Fig. 11, No. 14) with a large rounded 

 lobe on caudo-mesal angles; abdomen with a pale median dorsal 

 line in younger specimens, and lateral, usually interrupted stripes 

 on 2-6 and 8-9 ; 10 pale on sides. 



Measurements : total length, male 34-36, female 32-33 mm. ; 

 length of abdomen, male 27-33, female 25-29 mm. ; length of hind 

 wings, male 18.5-23, female 20-23 "i"^- > width of hind wings, 

 male 4-4.5, female 4.5 mm. 



Connecticut. — North Guilford (Pistapaug Pond), 27 July, 1920, 8 July, 

 1921 (P. G.). 



Argia violacea (Hagen) 

 Synopsis of the Neuroptera of North America, 90: 1861. 

 Nymph. — Color very dark brown. 



Head : proximal segment of the antennae light in color ; labium 

 with two or three lateral setae on the palpi ; the median lobe about 



