62 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



Female. — In general similar to the male in color; black stripe 

 of the niesopleural suture touching the lateral ends of the meso- 

 stigmal plates ; mesepisternal tubercles present at margins of the 

 mesostigmal plates ; pale stripe of the mesepisternum narrower 

 than the black stripe covering the niesopleural suture. 



Measurements: total length, male 30-31 mm.; length of abdo- 

 men, male 24-26, female 25-26 mm. ; length of hind wings, male 

 15-17, female 17-18 mm. 



New England. — July 27-August 23. 



Enallagma signatum (Hagen) 



Synopsis of the Neuroptera of North America, 84: 1861. 



Nymph.— Color buff or greenish. 



Head: elHptical in outline, caudo-lateral angles not projecting; 

 first 2 segments of the antennae dark in color, nearly equal in 

 length, the second slightly shorter, the third longest, the remaining 

 ones decreasing successively in length ; labium extending caudad 

 of procoxae, with 3 mental setae and 5 laterals. 



Thorax : legs light in color except a dark ring on each femur ; 

 tips of third tarsal segments dark ; metathoracic wing-cases 

 extending nearly to the fifth abdominal segment. 



Abdomen : segments of abdomen appear to have a greater 

 transverse diameter near the apical fourth on account of the pro- 

 jecting lateral keels ; the keels are well developed and setose, the 

 heavier setae being grouped mainly at one point near the apex of 

 each keel; dorsum of segments 4-8 with short heavy spines at 

 apices, terga 9 and 10 with more spines, usually extending onto 

 the venter ; sterna 2, 3 and 4 with a cluster of small thick spines 

 on the apical third, and the venter with a black line from basal 

 segment to segment 9; gills (PI. 11, Fig. 5) lanceolate, the dorso- 

 marginal spines of the median gill usually much heavier, just 

 proximad of the first transverse band of pigment; beyond the 

 ventral marginal row of setae, the margins of the lateral gills are 

 emarginate; the pigmentation of the gills consists of 3-5 broad 

 black cross-bands and a broad axial band from bases to the apices ; 

 ovipositor of female extending to the middle of abdominal seg- 

 ment 10. 



Measurements: length, 16-18 mm.; length of abdomen, 10.5- 

 12.5 mm.; length of gills, 5.5-6 mm.; width of gills, 1.6 mm.; 

 length of metathoracic wing-cases, 4 mm. ; length of median lobe, 

 2 mm. ; width, .5-1.8 mm. 



Adult, male. — Color pale blue or orange and black. 



Head : blue or orange and black ; first two segments of antennae 

 pale, at least much paler than the distal ones, the second segment 

 darker at the tip ; postclypeus black, sometimes with two median 

 pale spots, one on each side of the meson ; anteclypeus pale ; 



