46 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



Hamden (Lake Whitney). 17 June, 1904 (H. L. V.), 23 May, 1906 

 (B. H. W.). 28 May. 28 June. 4, 18 Tulv. 1920 (P. G.) : West Thompson, 

 12 July, 190S (H. L. V.) ; Portland, 15 August, 1913 (B. H. W.) ; Strat- 

 ford, 9 July, 1920; North Colebrook, 19 June, 1920 (P. G.) ; New London, 

 6-22 June, 1 921 (R. H. H.). 



New England. — May 14-September 26. 



Genus Chromagrion Needham 



Nymphs.— Head with caudo-lateral angles projecting and 

 forming a blunt tubercle ; labium with mental setae ; lateral keels 

 not spinulose; gills less than half as broad as long, with consider- 

 able cuticular pigment and without conspicuous tracheae ; with 

 tapering points; length (including gills) full grown about 20 mm. 



Adults. — Head without postocular spots; wings with 10-14 

 postnodal cross-veins; width of stigma less than its length, and 

 not remote from the margin in the male. Dorsum of thorax 

 never entirely metallic green, black and blue, and the mesopleural 

 suture without a dark stripe : caudal margin of prothorax of 

 female broken but not trilobed ; tibial setae never longer than the 

 intervals between their bases ; abdomen with terga 1-6 black, with 

 blue or yellow on the sides, and the female without a spine on 

 sternum of 8. 



Adults of this genus have been found in woodlands near shaded 

 pools, and the nymphs have been found in the waters of these 

 pools. The one species of the genus in Connecticut seems to have 

 a retiring habit and is well protected by its natural coloring. The 

 nymphs collected were dredged from the bottom near the shore, 

 in dead leaves and trash, well shaded. 



Chromagrion conditum (Hagen) 



Bulletin de TAcademle royale . . . de Belgique, 41: 1305: 1876. 



Nymph. — Color dark brown. 



Head : more than half as long as wide, the caudo-lateral angles 

 projecting strongly; labium when folded extending to the meso- 

 coxae ; mental setae 3, sometimes a small fourth ; lateral setae 5 ; 

 proximal segment of the palpus with a distinct hook at the apex 

 of the mesal process; antennae conspicuously annulate, segments 

 3, 4, and 6 each with a single dark ring, segment 2 dark at base 

 and apex, segment i nearly all dark. 



Thorax : front and middle femora each with two dark rings ; 

 tibiae with a basal ring; wing-cases extending to the fifth or 

 caudal margin of the fourth abdominal segment. 



Abdomen: lateral keels without spines ; cuticle often dark with 

 white spots; gills (PL 11, Fig. 2) long and slender, widening 

 gradually to near the apices, then contracted, the margins setose, 

 the setae far apart and increasing in size distad. Color of gills 

 dark brown, except the tips, which are light; indistinct blotches 



