136 NEUROPTERA OP NORTH AMERICA. 



2. D. obsoleta ! 



Libellula obsoleta Say, Journ. Acad. Philad. VIII, 28, 17. Libellula poly- 

 sticta Burm.! Handb. II, 856, 53. 



Testaceous, hairy ; mouth and front luteous ; thorax testaceous, 

 dorsum with a point each side, anteriorly, and the sides with a 

 spot upon the middle, inferiorly, yellow ; abdomen long, the base 

 inflated, the apex depressed, broad, testaceous ; appendages tes- 

 taceous, the superior ones long, the base cylindrical, the apex 

 broader outwardly, incurved, subacute ; the inferior one a little 

 shorter, triangular ; wings hyaline, the second series of antecubital 

 veins banded with yellow, the hind wings with a fulvous spot at 

 base, pterostigma small, yellow ; membranule white, the apex 

 black. (Male.) 



The female has the basal spot of the wings larger (Say.) 



7 8 antecubitals ; eight postcubitals ; two discoidal areolets, 

 then three following. 



Length 43 millim. Alar expanse 62 millim. Pterostigma 2 

 millim. 



Hob. New Orleans ; Indiana ; Massachusetts (Say). 



CORDULIA LEACH. 



Anal angle of the posterior wings of the male, acute (body 

 brassy-green). 



1. C. filosa! 



Cordulia filosa Hagen ! 



Obscure brassy green ; labium luteous, labrnm and front fuscous ; 

 front above, and the vertex brassy-green ; thorax brassy-green, 

 the sides, each, with two, obsolete, yellow lines ; feet black ; abdo- 

 men long, slender, the base inflated, then becoming more slender, 

 the apex a little broader, the second segment inferiorly, with a 

 lateral, luteous spot ; appendages black, the superior ones long, 

 cylindrical, arcuated, before the apex thicker, the apex recurved 

 outwards, the extreme apex unguiculated inside ; the inferior ap- 

 pendage half the length of the superior ones, narrow, triangular; 

 wings hyaline, pterostigma small, black ; membranule large, fuscous, 

 paler inwardly ; anal angle of the posterior wings acute in the male. 

 (g .) Eight antecubitals; six postcubitals; two discoidal areolets. 



Length 57 millim. Alar expanse 78 millim. Pterostigma 3 

 millim. 



Hob. Georgia (Abbot). 



