No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 



227 



projecting ventrad a distance equal to the vertical diameter of 

 segment 9. 



Measurements : total length, male 60, female 65-68 mm. ; length 

 of abdomen, male 43, female 47-50 mm. ; length of hind wings, 

 male 40, female 39-42 mm. ; length of stigma, male .3 mm. 



Connecticut. — A single male specimen collected by Mr. Zappe at Orange, 

 July 2, 1920. 



New England. — July 2-July 27. 



Group 3. The Tenebrosa Group 



Somatochlora tenebrosa (Say) 



Journal of the Academy of Natural Sciences of Philadelphia, 8: 14: 1839. 



Nymph (Fig. 52). — Labium reaching base of the mesosternum; 

 mental setae 11 to 12, the third to the sixth from the outside 

 longest ; lateral setae of the palpi 8 ; palpi with 9 or 10 crenula- 

 tions, the middle ones of which are about three times as long as 

 deep, and bear 6 or 7 setae in a graded series. 



Fig. 52. Nymph of Somato- 

 chlora tenebrosa, x 2.2. (From 

 Walker.) 



Fig. 53. Somatochlora tenebrosa, 

 anal appendages of adult. (From 

 Howe.) 



Abdomen: widest at segment 6; lateral spines on 8 and 9, 

 those on 8 about one-sixth the length of the lateral margins of 

 the segments, slightly divergent, those on 9 not divergent, about 

 one-fifth as long as the corresponding segment margin and about 

 three times as long as their basal breadth ; dorsal hooks on seg- 

 ment 4 or 5 to 9 ; vestigial on 4 when present ; very small on 5, 

 being about one-fourth as long as the tergite of this segment, 



