48 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [BuU. 



length of abdomen, male 27-29, female 27-30 mm. ; length of hind 

 wings, male 20-21, female 22 mm.; width of hind wings, male 

 and female, 4 mm. 



Connecticut.— Hamden, 4, 18 July, 1920 (P. G.) ; New London, 6-14 

 June, 1921 (R. H. H.). 



New England.— May 30-July 18. 



Genus Amphiagrion Selys 



Nymph, — Caudo-lateral margin of the head projecting and 

 forming a decided angle; labium with mental setae; abdomen 

 without spinulose lateral keels, the gills less than half as broad as 

 long, and without a long tapering point; length when grown 

 including gills about 16-20 mm. 



Adult. — Head without postocular spots ; front wings with 

 about 9 postnodals and AL arising between the third and fifth of 

 these; stigma of male not remote from the margin; dorsum of 

 thorax brown, the mesopleural suture not covered with black; 

 caudal margin of female prothorax entire ; tibial setae of middle 

 and hind tibiae about equal to the intervals between them ; abdo- 

 men with terga 1-6 reddish or brown, the female with a spine on 

 apex of the eighth sternum. 



Adults of this genus have been found near small streams and it 

 is probable that the nymphs live in such streams rather than in 

 ponds or lakes. Not much, however, is known of the habits of 

 the nymphs. 



Amphiagrion saucium (Burmeister) 



Handbuch der Entomologie, 2: 819: 1839. 



Nymph. — Color dark brown. 



Head : pentagonal and with strongly projecting caudo-lateral 

 angles ; labium broad, and extending to the metacoxae, the median 

 lobe with 3 or 4 mental setae; 6 lateral on the palpi. 



Thorax : legs uniform brown and without darker rings ; wing- 

 cases extending to the fourth or fifth abdominal segment. 



Abdomen : lateral keels absent or feebly developed and without 

 spinules ; ovipositor of female nearly reaching the apex of the 

 tenth segment in full-grown nymphs ; gills transparent ovate- 

 lanceolate, the tips gradually narrowed to a sharp point ; margins 

 of the gills setose from proximal to distal end, the setae placed 

 close together and increasing in length towards the apices ; tracheal 

 trunks sometimes dividing and forming a number of large 

 branches near the proximal fourth of the gill. 



Measurements: length, 11-14 mm.; length of abdomen, 7-10 

 mm. ; length of gills, 4.5 mm. ; width of gills, 1.5 mm. ; length of 

 median lobe, 1.75-2.0 mm.; width of median lobe, i. 25-1. 5 mm. 



Adult, male. — Color, very dark brown and deep orange-red. 



