226 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY 



[Bull. 



4, compressed, curved and acute, that of 5 rather more than a third 

 as long as the mid-dorsal length of the segment, increasing in size 

 caudad, that of 9 projecting over the entire loth segment ; median 

 appendage slightly shorter than segment 9 plus 10, and triangular. 



Measurements : length, 22 mm. ; width of abdomen, 9 mm. ; 

 length of hind femora, 6.5 mm. 



Adult, male. — Color brown to black, in part feebly metallic. 



Head: labium yellow, labrum and clypeus buff; front brown, 

 darker above; vertex, occiput and postgenae brown. 



Thorax : brown, with metallic lustre without pale lateral spots ; 

 legs black except the coxae, trochanters and part of the femora. 



Fig. 50. Nymph of Somata- 

 chlora linearis, x 1.7. (From 

 Walker.) 



Fig. 51. Somatochlora linearis, 

 anal appendages of adult. (From 

 Howe.) 



which are brown; entire ventral surface of the hind femora 

 spinose ; middle femora with a broad longitudinal band of spmes 

 from base to apex ; tibiae with ventral keels and flat apical spurs, 

 the keels three-fourths the length of the hind tibiae, but only about 

 one-tenth the length of the middle tibiae and about one-third the 

 length of the front ; tarsal claws with ventral tooth slightly beyond 

 the middle ; wings clear, slightly flavescent. 



Abdomen : slender, narrowed on segment 3, widened gradually 

 from 3 to 6, and slightly narrowed from 6 to 10 ; segments i and 

 2 widest : segments i and 2 brown ; terga 2 with a large yellow 

 spot near the lateral margin on each side; terga 3-10 black or 

 dark brown, 3 and 5-7 with a small yellow spot on each side near 

 base ; venter largely brown, venter of terga 5-9 with a touch of 

 yellow near the cephalo-lateral angles ; anal and accessory appen- 

 dages black; the superior anals almost truncate at the apex 



Female. — Superior anal appendages long, the vulvar lamina 



