232 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY 



[Bull. 



groups; lateral spines on segments 8 and 9, those on 8 usually- 

 less than one-fifth as long as the margin, not divergent, those on 

 9 about one-fifth the length of the margin; median superior 

 appendage longer than the laterals in profile, faintly convex above ; 

 lateral appendages of the male as long as segments 9 and 10 

 together measured directly in front of them. 



Measurements : total length, 20.5-23.5 mm. ; width of abdomen, 

 7.2-8 mm. ; length of hind femora, 5.8-6.5 mm. 



fi-- 



FiG. 59. Nymph of Somato- 

 chlora <albicincta, x 1.5. (From 

 Walker.) 



Fig. 60. Somatochlora albicinc~ 

 ta, anal appendages of the adult. 

 (From Howe.) 



Adult, male. — Color metallic green and black. 



Thorax: a pale streak on the mesepimera. 



Abdomen : pale rings on segments 2 to 8, but without pale spots 

 on the latero-cephalic angles; tips of the anal appendages (Fig. 

 60) bent sharply mesad at tips, but without a sub-basal, lateral 

 angle when seen in dorsal view. 



Female. — Vulvar lamina not projecting ventrad, the lobes 

 broadly rounded and with a notch between. 



Measurements : total length, male 47, female 45 mm. ; length 

 of abdomen, male 30, female 29 mm. ; length of hind wings, male 

 30-31, female about 33 mm. ; width of hind wings, male 9, female 

 10 mm. 



Specimens examined in the Museum of Comparative Zoology. 



Walker's measurements for this species are as follows: total 

 length, male 45-3-50, female 46-52 mm. ; length of abdomen, male 

 30-32, female 31-36.7 mm.; length of hind wing, male 28-31, 

 female 29-33 mm.; width of hind wing, male 8-9.125, female 

 9-10.5 mm. 



New England.— July 4- August 11. 



