No. 39] ODONATA OF CONNECTICUT: COENAGRIONIDAE 59 



ocellus, not dorsad of the antennal fossae ; postocular spots each 

 forming a wedge-shaped figure or comma ; black stripe of the 

 mesopleural suture distinct, never wanting 17 



17. Secx)nd abdominal tergum with a dark longitudinal stripe just 



above the lateral margins on each side geminatum 



Second abdominal tergum without a dark longitudinal stripe 18 



18. Caudal half of tergum 7 blue; dorsal arm of superior much longer 



than ventral arm in lateral profile aspersum 



Caudal half of tergum 7 black; dorsal arm of superior shorter 

 than ventral arm 19 



19. Dorsum of tergum 8 black from base to apex ; anal appendages 



as in Fig. 10, No. 13 exsulans 



Dorsum of tergum 8 with only a black spot at base ; anal appen- 

 dages as in Fig. 10, No. 2"] divagans 



Females" 



1. Three cross-veins present in the wings between M4 and Cui and 



between the subnodus and quadrangle durum 



Only two cross-veins between subnodus and quadrangle 2 



2. Prominent pits present in the pronotum. one on each of median 



lobes 3 



No prominent pits present in the pronotum 8 



3. Antennal segment 2 pale at base ; mesostigmal lamina reaching the 



mesopleural suture, the entire lateral end in contact with the 



katepisternum 4 



Antennal segment 2 not pale at base ; lateral end of the mesostig- 

 mal lamina touching the mesopleural suture at a single point only 6 



4. Black stripe of the mesopleural suture reduced in width to a line 



vesperum 

 Black stripe of the mesopleural suture not reduced in width to a 

 line 5 



5. Black stripe of the mesopleural suture touching the ventro-lateral 



end of the mesostigmal lamina (Fig. 11, No. 2) signatum 



Black stripe of the mesopleural suture not touching the ventro- 

 lateral end of the mesostigmal lamina pictum 



6. Abdominal tergum 8 with a large pale spot on each side ; black 



stripe present just above the ventro-lateral margin of the second 



tergum (sometimes brown or wanting) geminatum 



Abdominal tergum 8 without a large pale spot on each side ; with- 

 out stripe just above ventro-lateral margin of the second tergum 7 



7. Mesostigmal lamina narrowed at middle; caudal and lateral 



margins not elevated (Fig. 1 1, No. 5) ebrium 



Mesostigmal lamina widened at middle ; caudal and lateral margins 

 elevated (Fig. 11, No. 6) , hageni 



8. Pronotum with mound-like elevation on the caudal lobe, the caudal 



lamina conspicuously thickened at the middle ; stripe of the meso- 

 pleural suture reduced in width, and either divided by brown 



color over the suture or with brown margins 9 



Pronotum without a mound-like elevation on the caudal lobe; stripe 

 of the mesopleural suture uniform black and not reduced in 

 width 11 



9. Pale color of the face extending dorsad above the antennae ; black 



of the eighth abdominal segment reduced to a small basal dasli or 



stripe traviatum 



Pale color of the face not extending dorsad above the antennae; 

 black of the eighth never reduced to a small basal dash 10 



'' Females of recurvatuin and laterale not available. 



