2 14 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



fourths its length from the base, the ventral surface with a blunt 

 tooth at middle. 



Female. — Similar to the male ; anal appendages 3 mm. in length. 



Measurements : total length, male 40 mm. ; length of abdomen, 

 male 30 mm. ; length of hind wing, male 29 mm. ; length of stigma, 

 male and female, 2.5 mm. 



Male described from one specimen in collection of Connecticut 

 Agricultural Experiment Station without locality or place label. 



New England. — May 31- July 18. 



Genus Cordulia Leach 



Nymphs.^^ — Hind angles of the head rounded ; mental setae 

 about 14, lateral setae 7; no dorsal hooks (or very rudimentary 

 ones) ; lateral spines of segment 9 about one-fifth the length of 

 that segment. 



Adults. — Sectors of arculus separate to point of union with it; 

 triangle of the front wing with cross-vein; subtriangle absent, 

 there being only one cubito-anal cross-vein ; area between Cui 

 and M4 not widened at margin of front wing; no dark spots in 

 wings ; compound eyes contiguous ; female without a long forked 

 process on venter of segment 8; both sexes with abdomen con- 

 tracted behind segment 2 and slightly compressed ; color frequently 

 metallic. 



Cordulia shurtleffi Scudder 



Proceedings of the Boston Society of Natural History, 10: 217: 1866. 



N)miph. — Head : brown stripe between the eyes ; seven anten- 

 nal segments, segments 2, 4 and 7 subequal, i and 3, and 5 and 6 

 equal in length, labial palpi with 7 lateral setae, the mesal margins 

 with eight notches, the teeth between each with three spines, a long 

 one, another about half this, and a third very small. 



Thorax : femora with two brown rings each ; tibiae hairy. 



Abdomen: almost free from hairs except the caudal ventral 

 margin of segment 9 and the lateral keels; dorsum dark brown 

 with paler stripe on the meson ; lateral spines on segments 8 and 

 9 very short, not over .25 mm. ; terminal appendages i mm. long, 

 the laterals more than half the length of the ventral appendages. 



Measurements: total length (immature), 19 mm.; length of 

 abdomen, 11 mm.; hind femora, 5.5 mm.; width of abdomen, 

 6 mm.; length of segment 9 on ventro-meson, 1.75 mm. 



Adult, male. — Color brown, black, and metallic green. 



Head: labium buff, labrum black, yellow above; clypeus and 

 cephalo-ventral and lateral portions of the front, brown; dorsal 

 part of front and vertex, metallic green; occiput and postgenae 

 black. 



^ Apparently indistinguishable from some species of Sotnatochlora. 



