No. 39] ODONATA OF CONNECTICUT: COENAGRIONIDAE 41 



but usually with pigment in arcuate cross-bands ; gills with long 

 tapering points; length when grown (including gills) about 

 20 mm. 



Adults. — Head with postocular spots ; wings with 7-9 post- 

 nodal cross-veins ; the stigma about as wide as long and never 

 remote from the margin in the male ; dorsum of thorax never 

 entirely metallic green, and the caudal margin of prothorax entire ; 

 tibial setae usually shorter than the intervals between them, never 

 twice as long ; mesopleural suture covered with black ; abdominal 

 terga 1-6 never entirely red or buff, usually black with pale rings, 

 the basal segments sometimes red ; female with or without a 

 ventral spine on 8. 



A genus commonly found in Connecticut although there are 

 only four species represented. This is a small-pond and weedy- 

 lake genus, and all of the species with the possible exception of 

 kelHcotti may be found near such bodies of water. The eggs are 

 probably laid in the stems of plants below water. 



Key to Species 



Nymphs 



I. Gills with usually more than two distinct arcuate cross-bands and 



a blotch on the tip of the gill ; lateral setae of the labium five .posita 

 Gills with one or two cross-bands or none — ^never with four ; 

 lateral setae of the labium usually six verticalis 



Adults 

 Males and Females 



1. Mesopleural pale stripe interrupted at the caudal third to form a 



distinct exclamation point posita 



Mesopleural pale stripe not interrupted at the caudal third to form 

 a distinct exclamation point 2 



2. Eighth sternum of female with a long spine ; dorsum of ninth 



tergum black ramburii 



Eighth sternum of female without a long spine ; dorsum of ninth 

 tergum blue or black 3 



3. Seventh tergum with more or less blue on the dorsum; stigma 



usually blue beneath ; anal appendages as in Fig. 10, No. 16 . . . 



[kellicotti] 

 Seventh tergum black; stigma not usually blue beneath verticalis 



Ischnura posita (Hagen) 



Synopsis of the Neuroptera of North America, 77: 1861. 



Nymph. — Color usually dark brown. 



Head : with few spinules on the caudo-lateral margins, the 

 margins evenly rounded, not projecting ; second antennal segment 

 light at tip; labium extending between or slightly behind the 

 procoxae. Mental setae 4, sometimes a small fifth ; lateral setae 5. 



Thorax : femora with rows of heavy setae, tarsi pale, the apices 

 of the third segments brown ; metathoracic wing-cases extending 

 to the fourth abdominal segment. 



