No. 39] ODONATA OF CONNECTICUT: COENAGRIONIDAE 89 



This species has not been taken in Connecticut, but occurs in 

 New Jersey and Maryland. It is a striking form, very different 

 from other Argia species, the male resembling an Enallagma 

 strongly in color and size. 



Described from specimens received through the kindness of 

 William T. Davis. 



Argia moesta (Hagen) 



Synopsis of the Neuroptera of North America, 94: 1861. 



Nymph. — Color dark brown. 



Head : broad and flat, pentagonal, the caudo-lateral margins 

 projecting and with a few short setae; antennal segments dark 

 except the first, which is pale ; labium, with slightly narrowed 

 median lobe, the apical margin projecting strongly between the 

 palpi; mental setae absent; lateral marginal setae, about 12 in 

 number ; palpi with two fixed hooks on the proximal segment ; 

 setae of the palpi reduced to a single weak hair. 



Thorax: brown; pronotum projecting strongly laterad ; legs 

 not conspicuously banded but the femora with a faint preapical 

 ring and the proximal two-thirds evenly infuscated; tibiae with 

 dark spines, tarsi mostly pale ; wing-cases extending to the middle 

 of the fourth abdominal segment or beyond. 



Abdomen : uniform brown, the lateral keels feebly developed 

 and without spines ; styli of the male long, nearly reaching the 

 apex of the tenth segment; apical margin of 10 cleft nearly to 

 its base; gills uniform dark gray or nearly black, paler at the 

 tip, the margins parallel for a considerable distance. 



Measurements (young nymphs): length, 14 mm.; length of 

 abdomen, 9 mm. ; length of gills, 5-6 mm. ; width of gills, 3 mm. ; 

 length of metathoracic wing-cases, 4 mm. 



Adult, male. — Color, black and cinnamon-buff, older specimens 

 pollinose. 



Head : very dark brown above, shading into a lighter brown on 

 the labrum and surrounding parts ; postclypeus with two indefi- 

 nite dark spots ; black of the vertex often indefinite in extent, and 

 the whole dorsum of the head pollinose in older specimens. 



Thorax : pronotum dark brown with large pale spots on each 

 median lobe, the prothorax pollinose on the sides ; dorsal carina 

 of the mesothorax usually black, and the black of the episterna 

 occupying about half the width of each ; mesopleural suture black ; 

 mesepimerum nearly covered with black or dark brown, the stripe 

 separated from the mesopleural suture caudad; cephalic shoulders 

 of mesepimera brown ; metapleural suture black ; remainder of 

 thorax brown ; the whole of the meso- and metathorax becomes 

 pollinose, especially the dorsum ; legs striped, tarsi and claws 

 black; wings clear, with 15-19 postnodal cross-veins in the front 



