No. 39] ODONATA OF CONNECTICUT: COENAGRIONIDAE 49 



Head : dark brown or black to reddish above, mouth parts and 

 surrounding regions brown or buff; antennae buff or brown. 



Thorax : dark brown above ; color sometimes brick red or 

 almost black ; no definite stripes or spots present ; legs brown ; 

 tibial spines but little longer than the intervals between them ; 

 wings with about nine postnodal cross-veins in the front wing ; M2 

 arising between the fourth and sixth postnodal in the front wing 

 and between third and fifth in the hind ; stigma surmounting less 

 than one cell, the caudal margin usually shorter than the cephalic. 



Abdomen: red and black or nearly black; segments 1-6 red, 

 7-10 nearly black on the dorsum with paler basal rings and pale 

 on sides and below; anal appendages (Fig. 12, Nos. 14 and 15) 

 consisting of flat depressed superiors ; inferiors longer, acute, 

 subconical, the tips directed dorso-mesad. Apical margin of the 

 tenth segment with a deep rounded pit on the dorsum. 



Female. — Color usually lighter than the male. 



Thorax : not dark above as in the male. 



Abdomen: terga 1-4 reddish; 5-6 mostly red, sometimes with 

 black spots on each near the caudal fourth ; terga 7-9 each with 

 two dorsal black stripes which may, however, be fused; tergum 10 

 entirely pale ; eighth sternum with a long spine, ovipositor brown. 



Measurements: total length, male 23-26, female 24-26 mm.; 

 length of abdomen, male 19-21, female 19-21 mm.; length of hind 

 wings, male 13-16, female 15-16 mm.; width of hind wings, male 

 3-3.5, female 3.5 mm. 



Connecticut. — New Haven, 25, 26 May, 1904 (H. L. Y.), 20 July, 1904 

 (B. H. W.), 27 June, 1905 (W. E. B.) ; New London, 8, 9 June, 1921 

 (R. H. H.) ; Middletown, 18 June, 1904 (W. E. B.), 14 July, 1921 (P. G.). 



New England. — May 25- July 29. 



Genus Nehallenia Selys 



Nymphs. — Caudo-lateral margins of the head rounded ; labium 

 with mental setae ; abdomen with spinulose lateral keels, the gills 

 with moderately sharp points, the tracheae more numerous at the 

 widest part of the gill; total length including gills, about 15 mm. 

 when grown. 



Adults. — Head without postocular spots ; wings with about 1 1 

 postnodals ; and M, arising between the third and fifth postnodal 

 cross-vein in the front wing ; stigma of male not remote from the 

 margin ; dorsum of thorax entirely metallic green, the caudal 

 margin of the female prothorax hi- or trilobed or entire; tibial 

 setae mostly shorter than the intervals between their bases ; meso- 

 plcural suture covered with green ; abdomen with terga 1-6 green 

 and the female without a ventral spine on 8. 



The adults of this genus may be found usually near small ponds 

 or sphagum bogs. The nymphs are not commonly collected but 

 have been taken in a small open pond at Mt. Carmel. 



