Io6 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



Abdomen : with apical spines on the lateral keels of segments 

 5-9, venter of the abdomen often with dark stripes beneath the 

 lateral keels, and the caudo-lateral angles of terga 1-8 with dark 

 spots above the lateral keels; gills (PI. i, Fig. i) widest near 

 the base, and gradually tapering to a point at apex, not contracted 

 beyond the middle and widened again beyond as in rectangidaris 

 and forcipatus; ovipositor extending to the apex of the tenth 

 segment. 



Measurements: length, 19 mm.; length of abdomen, 14 mm.; 

 length of gills, 9 mm.; width of gills, 1.5-2 mm.; length of 

 median lobe, 4 mm. ; width of median lobe, .5-1.5 mm. 



Adult, male. — Color dull brown or metallic green, and yellow. 



Head : metallic green and brown, often more or less bronzed ; 

 proximal segment of the antennae pale at apex ; occiput and post- 

 genal regions wholly or in part yellow ; poUinose or nearly black 

 in older individuals. 



Thorax : dull brown and yellow, sometimes partly metallic, but 

 never uniform bright green ; pronotum with irregular H-shaped 

 marks on the median lobes or entirely dark and pollinose; meso- 

 thorax brown or greenish, with yellow dorsal carina, mesopleural 

 suture, and cephalic shoulder of the epimerum ; the katepisterna 

 are yellow and brown or black ; metathorax usually yellow except 

 a triangle of brown on caudo-dorsal angles of the episterna ; some- 

 times obscurely blackened and pollinose; wings clear, the post- 

 nodal cross-veins 9-1 1 and Mg arising between the second and 

 third of these in the front wing, usually near the second in the 

 hind. 



Abdomen : mostly yellow in tenerals, dark metallic green or 

 brown in older specimens ; dorsum of terga i brown on caudal 

 half, or pollinose; terga 2-10 all dark on dorsum, 2-7 sometimes 

 green, lateral margins of 2-7 pale; sides of 2 and 8, and nearly 

 all of 9 and 10 frequently pollinose; anal appendages dark, the 

 superiors pale at base, the ventro-mesal margins with a spine near 

 base and a row of spinules beyond to the distal third of the appen- 

 dage ; inferiors S-shaped, the apical portions curved in an opposite 

 direction from the superiors. 



Female. — Color similar to the male. 



Abdomen : with wider lateral stripes on the terga, and polli- 

 nosity usually undeveloped ; ovipositor reaching the apex of the 

 tenth segment, the lateral valves black on about the ventral third, 

 and ventral margins of terga also black. 



Measurements : length, male 36-39, female 35 mm. ; length of 

 abdomen, male 27, female 26-27 mm. ; length of hind wings, male 

 18-21, female 21-22 mm. ; width of hind wings, male 4.5-5, female 

 4.5-5 mm. 



Connecticut. — Stratford, 9 July, 1920; Guilford, 27 July, 1920 (P. G.). 

 New England. — June iS-September 8. 



