2o8 CONNECTICUT GEOL. AND NAT. HIST, SURVEY [Bull. 



the distal members; segments 2-9 with black, minutely serrate, 

 longitudinal, lateral keels, the terga somewhat lighter on the sides. 



Female. — A forked process on the venter of 9, the process 

 projecting to the tip of that segment; superior anal appendages 

 longer than segment 9 plus 10 (6 mm.). 



Measurements: total length, male 62-64, female 62-68 mm.; 

 length of abdomen, female 45 mm.; length of hind wing, male 

 40, female 43-45 mm. ; length of stigma, male and female, 3-4 mm. 



Connecticut.— Guilford, 27 July, 1920 (M. P. Z.), 8 July, 1921 (P. G.) ; 

 East Haven, 4 July, 1921 (P. G.) ; Wallingford, 13 August, 1922 

 (S. W. B.). 



New England. — May 25-August 27. 



Genus Helocordulia Needham 



Nymphs. — Hind margins of the head rounded; mental setae 

 12-14, palpal setae 6 or 7; dorsal hooks present on abdominal 

 segments 6-9, lateral spines of segment 9 extending to the tip of 

 the terminal appendages. 



Adults. — Sectors of arculus separated at point of union with 

 the latter; triangle of front wings usually with cross-veins, sub- 

 triangle usually absent in hind wings, there being only one cubito- 

 anal cross-vein ; area between Cu^ and M^ not widened at margin 

 of front wing ; dark spots at base and along costal margins ; abdo- 

 men of female without long forked process on venter of 8; seg- 

 ment 3 of abdomen compressed. 



Not much is known of the habits of this genus, but the adults 

 are day-fliers, not crepuscular. 



Helocordulia uhleri (Selys) 



Bulletin de I'Academie royale . . . de Belgique (2), 31: 274: 1871. 



Nymph. — Labium with strongly projecting median lobe ; mental 

 setae 12 to 13 on each side, those nearest the mesal line very 

 minute ; setae of the labial palpi 6 to 7, the movable hook on distal 

 segment little larger than the setae; spines of the teeth about 4 

 in number on each. 



Abdomen-*: dorsal hooks on segments 6 to 9 inclusive; mere 

 rudiments in front of this ; lateral spines on segments 7 to 9, those 

 on 9 about one-third as long as that segment. Lateral spines on 

 segment 9 approximately as long as the dorsum of that segment. 



Measurements : total length, 20 mm. ; length of abdomen, 1 1 

 mm. ; width, 6 mm. ; length of hind femora, 6-6.5 mm. 



Adult, male. — Color dark brown and black. 



Head: face including labium, clypeus, genae and front, yellow 

 or brown, the dorsal surface of the front much depressed in the 

 center and blackish brown in the depression; occiput and post- 

 genae brown. 



"From Needham. J. G., Bull. N. Y. State Museum 47: 408. 



