CORDULIA. 139 



margin, in the females, subflavescent ; pterostigma fulvous; mem- 

 branule large, fuscous, whitish at the base ; anal angle of the 

 males subacute ; 7 8 antecubitals ; 7 8 postcubitals ; two dis- 

 coidal areolets. 



Length 48 millim. Alar expanse 66 millim. Pterostigma 3 

 millim. 



Hob. Labrador. Is it not C. franUinit 



14. C. septentrionalis ! 



Cordulia septentrionalis Hagen! 



Brassy-green, hairy ; labium luteous ; front brassy-green above, 

 each side with a yellow spot; vertex brassy-green; thorax brassy- 

 green, dorsum with a spot each side at the wings, and the sides 

 each with two maculose stripes, yellow; feet black, anterior femora 

 yellowish at base ; abdomen slender, behind the base inflated, then 

 attenuated, with the apex equal, brassy-black, the base 1 each side, 

 obsoletely luteous; the apex each side luteous, villose; append- 

 ages black, superior ones longer, subdepressed, straight, with a 

 larger, basal tooth beneath, and a smaller one upon the external 

 middle, internal, apical hook oblique, longer, the tip recurved; the 

 inferior appendage half the length of the superiors, triangular ; 

 vulvar lamina bilobed ; wings hyaline, the posterior ones with a 

 small, basal, triangular, brownish-black spot, pterostigma small, 

 fulvous ; membranule large, fuscous, the base whitish ; anal angle 

 of the males subacute ; seven antecubitals ; seven postcubitals ; 

 two discoidal areolets. 



Length 43 millim. Alar expanse 60 millim. Pterostigma 2| 

 millim. 



Hob. Labrador. Is it not C. richardsoni? 



15. C. lateralis ! 



Epophthalmia lateralis Burm.! Handb. II, 847, 7. Libelluta cynosura Say, 

 Jour. Acad. Philad. VIII, 30, 19. 



Fuscous; mouth and front luteous, above with an ante-ocular, 

 narrow, black fascia ; thorax lutep-fuscous, with gray hair, sides 

 with an obsolete, yellow stripe ; feet black, anterior femora almost 

 entirely, arid the base of the others luteous ; abdomen depressed, 

 a little broadened, the base inflated, compressed ; brownish-black, 

 each side with a marginal, maculose, yellow stripe ; appendages 

 black, superior ones long, cylindrical, obtuse, sub-arcuated, the 



