No. 39] ODONATA OF CONNECTICUT: COENAGRIONIDAE 63 



labrum pale, the dorsal margin with a niesal black spot and two 

 lateral, or with a transverse stripe of black including the three 

 spots; pale transverse area above the clypeus extending slightly 

 dorsad of the antennae, orange or blue; remainder of the front 

 and vertex black ; postocular spots large, cuneiform, and yellow 

 or blue; postgenae and the occiput largely yellow. 



Thorax : orange or blue and black ; pronotum black, the 

 cephalic lobe, a subcircular spot on each median lobe, and the 

 caudal lobe blue or yellow ; the spots on the median lobes are 

 variable, being frequently subcircular with an emargination on 

 one side; in younger individuals there are also two smaller spots 

 mesad of the large spots on each mesal lobe ; proepimera blue or 

 yellow, darker above ; mesopleural suture also with a broad black 

 stripe which is widest caudad of the katepisternum and extends 

 cephalad and covers the dorsal third of that sclerite ; the remainder 

 of the thorax is pale blue or orange, bufif-colored below ; legs 

 usually bufif, the femora each with an indefinite dorsal brown line 

 and row of spots, the tibiae with a faint dorsal line or row of 

 dashes; tarsi pale, darker at apices; wings with 9-1 1 postnodal 

 cross-veins in the front wing; M^ usually arising near the fifth 

 postnodal vein in the front wing, between the fourth and fifth, or 

 third and fourth in the hind, usually near the fourth. 



Abdomen: orange or blue and black; dorsum of terga 1-8 

 inclusive, black, except interrupted basal rings on 3-7, lateral sur- 

 faces of I and 2, and the lateral margins of 3-8 ; all of tergum 9 

 and the lateral surfaces of the tenth orange or blue, the dorsum 

 of 10 being black; anal appendages dark brown (Fig. 10, No. 22) 

 the superiors longer than the inferiors and blunt at the apices, the 

 lateral surfaces convex, the mesal surfaces somewhat concave, 

 tips dark ; inferiors about half as long as the superiors, sub- 

 conical, the tips black and directed mesad. 



Female. — Color pale blue or orange, sometimes greenish and 

 black. 



Head : similar to that of the male. 



Thorax : similar to the male ; the orange females are, however, 

 less frequent; mesostigmal plates (Fig. 11, No. 2) long, the 

 lateral margins rounded, and depressed, and a pale diagonal stripe 

 across the plates ; the lateral margins reach the katepisterna. 



Abdomen: blue or orange and black; terga 1-9 with black, 

 dorsal, longitudinal stripes from bases to the apices, stripes 

 widened near the apex on 2-7 and narrowed on 9, lateral surfaces 

 of all terga, basal rings on 3-7, and apical ring on i yellow or 

 bluish; all of segment 10 yellow or blue. 



Measurements : total length, male 32-35, female 34-35 mm. ; 

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

 wings, male 17, female 18-20 mm. ; width of hind wings, male 3.5, 

 female 3.5-4. 



