224 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY 



[Bull. 



teeth at base ; the small lateral teeth show more plainly in lateral 

 view ; tips of superiors upturned. 



Measurements : total length, male 46 mm. ; length of abdomen, 

 29 mm. ; length of hind wings, 33 mm. ; width, 9.5 mm. 



Connecticut. — A male taken at Breakneck Pond, Union, 24 June, 1921, 

 by Mr. S. W. Bromley, belongs here. 

 New England. — June-September. 



Somatochlora williamsoni Walker 

 Canadian Entomologist, 39: 69-74: 1907, pi. 11, figs, i-i, c. 



Nymph (Fig. 48). — Uniform dark to light brown. 



Head : hinge of labium reaching middle coxae ; mentum about 

 as broad as long, somewhat constricted at about the basal fifth, 

 and again at the apical fourth. Crenulations of the lateral lobes 

 broadly and regularly arcuate, the larger ones with a group of 

 about seven setae, the longest, usually the second or third from the 

 lower end, about as long as the crenulation. Mental setae 11 or 

 12, the fourth or fifth from the outer end longest; lateral setae 8. 



Fig. 48. Nymph of Somato- 

 chlora williamsoni, x 1.5. (From 

 Walker.) 



^y^yy^ 



Fig. 49. Somatochlora william- 

 soni, anal appendages of adult. 

 (From Howe.) 



Abdomen widest at 6, nearly hairless except along lateral margiiis 

 where the fringe is of about average length and density and is 

 much longer on the sides of 9 and 10 than elsewhere, sorne of the 

 hairs on these segments being as long as the lateral margins of 9. 

 Lateral spines on 8 and 9 rather slender, those on 8 one-fifth or 

 one-fourth as long as the margin of the segment, and less than 

 half as broad at base as long, not divergent; those on 9 one- 

 fourth to one-third as long as the corresponding margin, more 

 than twice as long as their basal breadth subparallel. Dorsal hooks 



