No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 253 



terga 6-8 ; venter of all terga entirely pale yellowish green ; sur- 

 face of abdomen smooth ; anal appendages dark brown, the 

 superiors slightly longer than the inferior; hamules (Fig. 63, 

 No. 7) of the second segment with a flattened area beneath, con- 

 spicuous mesal hooks and small lateral lobes extending caudad ; 

 transverse median carinae on terga 2 and 3, that on 2 interrupted 

 in middle. 



Female. — With brown of the apex of the wings reduced to a 

 transverse band about the width of the stigma, lateral margins of 

 eighth terga produced ventrad. 



Measurements : total length, male 44-48, female 43 mm. ; length 

 of abdomen, male 25-28, female 26 mm. ; length of hind wings, 

 male 35-39, female 35 mm.; width of hind wings, male lo-ii, 

 female 10 mm. ; length of stigma, male and female, 5 mm. 



Most closely related to qiiadrimaculata, from which, however, it 

 may be distinguished by the wing characters. It is a rather 

 common species throughout Connecticut. 



Connecticut. — New Haven, 20 July, 1905 (B. H. W.) ; Branford, 21 

 July, 1920 (P. G.). 



New England. — June 2-August 16. 



Libellula vibrans var. vibrans Fabricius 



Entomologiae Systematicae, 2: 380: 1793. 



Adult, male (PI. xxi, Fig. 8). — Color largely brown to black. 



Head : labium yellowish buflf, though somewhat darker on the 

 meson and in front : labrum yellowish bufif, clypeus and front to 

 near ocelli, greenish white; vertex black, projecting over the 

 median ocellus, the tip truncate and concave when viewed from 

 above ; occiput and postgenae black, the postgenae with two large 

 yellow spots on each side behind the lateral margins of the 

 compound eyes. 



Thorax : prothorax uniform dark brown, the caudal margin of 

 the pronotum entire and with but few hairs ; meso- and meta- 

 thorax dark brown, lighter on the sides, being a sort of olive color 

 in the specimen at hand ; shoulders of the epimera almost black, 

 venter olive color ; legs, with coxae and trochanters, nearly all of 

 the front femora, middle femora at base, and half the hind femora 

 brown, the remainder of the legs black ; tarsal claws with ventral 

 tooth considerably beyond the middle, the proximal portion of the 

 claw thicker than the distal ; wings with basal streak of brown 

 between Sc and R, extending from base to shortly beyond the 

 arculus, a small spot occupying all or part of the first postnodal 

 cell, and the apical margins with a touch of brown ; membrane of 

 the hind wings brown ; stigma black. 



Abdomen : brown to black above, olive-colored below, the seg- 

 ments toward the tip darker ; anal appendages black, the superiors 

 only about one-third or one-fourth longer than the inferior; 



