8o CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



Enallagma exsulans (Hagen) 



Synopsis of the Neuroptera of North America, 82: 1861. 



Nymph. — Color dark brown or greenish. 



Head : shghtly broader than long, the caudo-lateral angles pro- 

 jecting strongly caudad; second antennal segment shorter than 

 the first, the first two darker than the remaining ones and pilose ; 

 mental setae three, laterals usually four, occasionally five. 



Thorax : femora with the usual preapical brown rings ; apices 

 of the third tarsal segments and the apices of the claws dark; 

 metathoracic wing-cases extending to the fourth abdominal seg- 

 ment. 



Abdomen : cuticle with minute dark spots and setae, the cuticle, 

 however, uniform brown in some; lateral keels on segments 4-8 

 and lateral apex of segment 9 with groups of 2-6 spines ; dorsal 

 surface of keels with minute setae ; gills (PL 11, Fig. 9) lanceolate, 

 broadest beyond middle, usually heavily pigmented on the proxi- 

 mal two-thirds, the infuscation being followed by two large clear 

 spots on each side of the axis ; tip of gills dark except the extreme 

 tip; dorsal spines of median gill and ventral marginal spines of 

 the laterals extending nearly two-thirds the length of the gills 

 from their bases. Smaller trachea forming alga-like patches. 

 Pigmentation of the gills of younger nymphs is not distinct except 

 for the alga-like patches. 



Measurements: length, 12-13. 5 mm.; length of abdomen, 9-10 

 mm.; length of gills, 5.5-7 mm.; width of gills, 1.3-2; length of 

 median lobe, 2 mm.; width, .6-1.8 mm. 



Adult, male. — Color blue, black and brown. 



Head: blue and black; antennae black; postclypeus shining 

 black, the anteclypeus pale, and the labrum with a transverse black 

 stripe on the dorsal margin ; front above clypeus to the antennae 

 pale, remainder of the front and vertex black ; postocular spots 

 and postgenae yellow or blue. 



Thorax : blue and black ; pronotum black, the cephalic lobe 

 blue ; large spots on the mesal lobes and smaller ones on the same 

 near the meson ; also a blue mesal spot on the caudal lamina ; pro- 

 pleura black along the dorsal border, blue below; mesostigmal 

 plates with the lateral angles blue ; black stripe of the dorsum of 

 mesothorax occupying about half of each anepisterna; blue stripe 

 of the anepisterna narrowed at the caudal end widest above the 

 katepisterna ; black stripe of the mesopleural suture broad extend- 

 ing onto the katepisterna and in younger specimens divided by a 

 brown line directly over the suture ; black spots on the metapleural 

 suture near the wing bases, the remainder of the pleura blue; 

 postcoxal areas bufif ; legs pale blue or brown and black ; femora 

 black above, usually with a pale spot at base ; tarsi and claws pale, 

 dark at tips ; wings with 10-12 postnodal cross-veins in the front 



