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



i6, female i8 mm. ; width of hind wings, male 3.5, female 4 mm. ; 

 length of pterostigma, .75-1 mm. 



Connecticut. — Collected at Branford (Indian Neck), August 11, 1921 

 (P. G.), and at North Haven, August 10, 1921, by Dr. Britton. 

 New England. — July 20-October 2. 



Ischnura verticalis (Say) 



Journal of the Academy of Natural Sciences of Philadelphia, 8 : Zl- 



Nymph. — Color green or brown. 



Head : caudo-lateral margins with spines, first two antennal 

 segments and proximal third of 3 dark in color, remainder pale; 

 labium extending caudad of the procoxae ; median lobe with 4 or 

 5 mental setae and 6 lateral setae on palpi. 



Thorax : femora with preapical brown rings ; metathoracic 

 wing-cases extending to the middle of the fourth, sometimes 

 nearly to the fifth abdominal segment. 



Abdomen : with lateral keels, cephalic two-thirds of the dorsum 

 of which are provided with small setae evenly distributed over the 

 keel ; the keels of segments 2-7 are light at the apices ; cuticle 

 thickly provided with small black dots, each bearing a small seta, 

 the caudal margin of each segment, however, without setae, but 

 with short, white longtitudinal dashes, especially marked on the 

 venter; gills (PI. 11, Fig. i) with long tapering points; the spines 

 of the median gill extending less than half the length of the gill 

 from the base; apices of the gills with long hairs; gill pigment 

 usually in the form of arcuate cross-bands, of which there are 

 usually two, but they may be entirely wanting, especially in 

 yoimger nymphs ; ovipositor of female extending to the middle 

 of abdominal segment 10 or a little beyond. 



Measurements: length (without gills), 13-14 mm.; length of 

 abdomen, 9-10 mm. ; length of gills, 6-7 mm. ; width of gills, 

 1-1.3 mm.; length of median lobe, 1.8 mm.; width of median 

 lobe, .6-1.6 mm. 



Adult, male. — Color black or dark metallic green and pale 

 green. 



Head: black and yellowish green; postclypeus black, shining; 

 anteclypeus. labrum, mandibles, their trochantins, genae and front 

 above the clypeus, largely yellowish green ; postocular spots large 

 and subcircular ; vertex and front except the transverse area 

 above the clypeus dull black ; occiput black and greenish yellow. 



Thorax : greenish black and greenish yellow ; pronotum shin- 

 ing black, except the front lobe; propleura largely yellow, meso- 

 thorax shining black wdth a yellowish stripe just above the meso- 

 pleural suture; ventral half or two-thirds and the cephalic 

 shoulder of the mesepimera yellow ; paraptera with a yellow spot 

 ventrad of the lateral angles, the remainder black ; mesostigmal 

 plates black, the caudal margins elevated and yellow ; metathorax 



