No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 225 



present on segments 5 or 6 to 9, but little elevated and not pro- 

 jecting beyond the hind margin of their segments except slightly 

 in the case of those on 8 and 9 ; compressed, slightly hooked, with 

 blunt or rounded apices. Lateral and median appendages about 

 as long as 9 plus 10 measured in line with the former. 



Measurements : length, 23-25 mm. ; length of hind femora, 

 7-7.3 mm. ; width of abdomen, 8-9 mm. 



Adult, male. — Color metallic green and black; labrum black. 



Thorax: yellow marks on the sides obscured, but a faint indi- 

 cation of a mesothoracic stripe and metathoracic spot. 



Abdomen : black with two obscure spots on sides of 2 and at 

 base of 3; anal appendages very similar to elongata (Fig. 49) the 

 tips upturned, but differing from elongata in having a small basal 

 tooth on the superiors in dorsal view. 



Female. — Similar to the male, but the abdomen with prominent 

 yellow spots on the cephalo-lateral angles of terga 4, 5, and 6; 

 pale spots on the sides of 2 unbroken ; vulvar lamina long, spout- 

 shaped, laterally compressed, and about as long as the height of 

 segment 9; anal appendages (superiors) a trifle longer than 

 segments 9 and 10 together. 



Measurements : total length, male 53.5-59, female 55-59.5 mm. ; 

 length of abdomen, male 36-40, female 38.5-42 mm. ; length of 

 hind wings, male and female, 35-40 mm. ; width of hind wings, 

 male 9.5-1 1, female 11-12 mm. 



Connecticut. — A female collected at Litchfield by L. B. Woodruff and 

 standing under tcnebrosa in the latter's collection belongs here. It differs 

 from the latter species in having the labrum mostly black and in being 

 provided with lateral yellow spots on segments 4, 5, and 6 of the abdomen. 



Group 2. The Linearis Group 



Somatochlora linearis Hagen 



Synopsis of the Neuroptera of North America, 137: 1861. 



Nymph (Fig. 50). — Head: hinge of labium reaching a little 

 beyond base of the mesosternum. Mental setae 11 to 12, the 5th 

 and 6th from the outside longest ; lateral lobes with 9 crenulations 

 each, with a group of 6 or 7 spines, the longest of which are 

 nearly as long as the corresponding crenulation ; lateral setae of 

 the palpi 8. 



Thorax : hind wing-cases reaching about the middle of abdomi- 

 nal segment 6. 



Abdomen: broadest at segments 5 and 6, 1.5 times as broad as 

 the head across the eyes ; no definite fringe of hairs on the hind 

 margins of the abdominal tergites ; lateral spines of segment 8 

 about one-fifth the length of the margin of this segment; those 

 on 9 one-fourth to one-fifth the length of the corresponding seg- 

 ment margin; dorsal hooks on segments 5 to 9 and a vestige on 



