2 28 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



barely half the corresponding length on 6; well developed on 

 the remaining segments, being about as long as the segments 

 that bear them; hook on segment 9 projecting well over the 

 hind margin of segment 10; median appendage about as long 

 as segments 9 plus 10 measured mid-dorsally triangular, in profile 

 somewhat concave above in the male, with a slightly elevated sub- 

 apical prominence. 



Measurements : total length, 20 mm. ; width of head, 6 mm. ; 

 width of abdomen, 8 mm. ; length of hind femora, 6 mm. 



Adult, male. — Color black and metallic green. 



Head : labium pale, labrum yellow with a black ventral border 

 and dorso-mesal spot ; front dark above, occiput brown, postgenae 

 black. 



Thorax: metallic green and brown with a yellow stripe on the 

 mesepimera and an elongate spot on the metepimera; legs black, 

 the front femora pale at base ; wings clear, usually without flaves- 

 cent areas, sometimes yellow at anal triangle. 



Abdomen: second segment with a pale spot shortly above the 

 lateral margin ; margins of segment 3 obscurely pale ; remainder 

 of the abdomen black, brown beneath; anal appendages (Fig. 53) 

 bent sharply ventrad and mesad, the tips slender. Inferior appen- 

 dage nearly as broad at tip as at base, three-fourths as long as the 

 superiors. 



Female. — Similar to the male, the anal appendages as long as 

 segments 9 and 10 together, the vulvar lamina much narrower at 

 the base than the width of segment 9 ; length of anal appendages 

 3.5-4.7 mm. 



Measurements : total length, male 55-56, female 58 mm. ; length 

 of abdomen, male 40, female 36-40 mm. ; length of hind wing, 

 male 38-39, female 37-39 mm. ; width of hind wings, male 12, 

 female 12 mm. ; length of stigma, male and female, 3 mm. 



Connecticut. — Wallingford, 13 August, 1922 (S. W. Bromley). 

 New England. — August i- September 8. 



Group 4. The Filosa Group 



This group contains filosa and provocans, of which the latter 

 perhaps is most likely to be found in Connecticut. The anal 

 appendages of the male of provocans are shown in Fig. 42, 

 Nos. 7, 8. 



Group 5. The Arctic a Group 



Somatochlora forcipata (Scudder) 

 Proceedings of the Boston Society of Natural History, 10: 216: 1866. 

 Nymph (Fig. 54). — ^Very hairy; labium small, eyes entirely 

 uncovered, the submentum reaching scarcely to the middle of the 

 mesocoxae; palpi with 7-9 rounded crenulations, each with three 

 to five setae; lateral setae 9, rarely 10; mental setae 12 to 15, the 

 fourth to sixth from the outside, longest. 



