LIBELLULA. 155 



L. exusta Say, differs in having twelve to thirteen postcubital 

 cross-nervules ; it may be a different species. 



******** 



(The females have the sides of the eighth abdominal segment dilated.) 

 Species 11 17. 



*2x 



11. L. auripennis ! ( 



Libellula auripennis Burm.l Handb. II, 861, 77. Libellula costalis Ramb.! 

 Neuropt. 59, 36. 



Reddish-yellow; thorax red, or with a middle, dorsal yellow 

 stripe (teneral); feet reddish; abdomen long, slender, triquetral, 

 reddish-yellow, a dorsal stripe, lost anteriorly, black ; wings sub- 

 furnose, veined with yellow; the anterior margin flavescent ; the 

 apex sometimes infuscated ; pterostigma large, yellow or red ; 

 membranule black; 15 18 antecubitals; 11 15 postcubitals ; 

 four discoidal areolets. 



Length 48 56 millim. Alar expanse 76 85 millim. Ptero- 

 stigma 6 millim. 



Hob. ]S T ew Jersey (Guex) ; Maryland (Uhler) ; ]S T ew York ; 

 Ohio ; Savannah, Georgia ; ISTew Orleans, Louisiana ; Florida 

 (Osteu Sacken). 



12. L. incesta ! 



Libellula incesta Hagen ! 



Black, pruinose ; labium luteous, front superiorly, brassy-black ; 

 sides of the thorax paler, pruinose, terminated inferiorly with 

 black; feet black, base of the femora fuscous; abdomen long, 

 slender, triquetral, black, pruinose ; wings hyaline, veined with 

 black, the apex hardly infuscated; pterostigma long, black; mem- 

 branule cinereous. (Male.) 



Fifteen antecubitals ; twelve postcubitals ; three discoidal are- 

 olets. 



Length 54 millim. Alar expanse 84 millim. Pterostigma 6 

 millim. 



Hal. Carolina (Zimmerman). 



13. L. lydia ! 



Libellula lydia Drury, Ins. II, 85 ; pi. xlvii, fig. 1. Ramb. ! Neuropt. 

 55, 32 ; Oliv. Enc. Meth. VII, 570, 8. Libellula leda Say, Journ. 

 Acad. Philad. VIII, 22, 8, var. A. 



Reddish-yellow; front whitish; vertex, and labium in the mid- 



