No. 39] ODONATA OF CONNECTICUT: COENAGRIONIDAE 39 



dorsum of thorax not entirely metallic green, usually yellow and 

 black, and the caudal margin of the prothorax entire ; tibial setae 

 (middle and hind) shorter than the intervals between them and 

 the mesopleural suture usually lined with black; abdomen with 

 terga i-6 orange or yellow and black; female with a ventral spine 

 on segment 8. 



Anornalagrion nymphs are difficult to distinguish from the 

 nymphs of Ischnura, but are usually of smaller size; the lateral 

 setae are five in number and the abdomen is not as prominently 

 spotted. In addition, the smaller tracheae of the gills are incon- 

 spicuous, especially towards the margins of the widest portions, 

 as shown in PI. ii. Fig. 7. Of the Ischnuras the species posita 

 gives the most trouble, and apparently the only satisfactory char- 

 acter for separating them is found in the gills, which are much 

 more prominently banded than in other members of the genus or 

 the genus Anonialagrion. 



The only adults of this genus which I have collected in Con- 

 necticut were found near brackish water not far from Long Island 

 Sound. It does not seem, however, that this is the normal habitat 

 of the adult. It has been seen and collected by others in quite 

 different localities and the nymphs are known to inhabit small 

 fresh-water pools or ponds. 



Anomalagrion hastatum (Say) 



• Tournal of the Academy of Natural Sciences of Philadelphia, 8 : 38 : 

 1830. 



Nymph. — Color green or buff. 



Head : with rounded caudo-lateral angles ; antennae with first 

 two segments brown in color, the remaining ones lighter ; labium 

 not extending caudad of the procoxae, the median lobe about as 

 broad as long; mental setae 4, lateral setae 5. 



Thorax : legs without dark rings ; wing-cases extending nearly 

 to the fourth abdominal segment. 



Abdomen : lateral keels feebly developed and with minute 

 spines, gills (PI. 11, Fig. 7) lanceolate and with a long point; dorsal 

 marginal spines of the median gill consisting of a thick row, 

 extending about one-third the length of the gill from the base; 

 ventral marginal spines of the lateral gills extending slightly 

 further from the base than the dorsal row ; ovipositor extending 

 to the caudal margin of the tenth abdominal segment. 



Measurements : length, 9.5 mm. ; length of abdomen, 5.5 mm. ; 

 length of gills, 4.5 mm. ; width of gills, i.o mm. ; length of median 

 lobe, 1.6 mm.; width of median lobe, 0.5-2.0 mm. 



Adult, male. — Color pale lemon-yellow and black. 



Head : lemon-yellow and metallic black or green ; antennae 

 brown except the proximal segment, which has a pale stripe from 

 the base to the apex ; postclypeus black, lateral margins sometimes 



