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. 



11. L. auripennis ! 



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

 Keuropt. 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- 

 fumose, 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. 



Hab. New Jersey (G-uex) ; Maryland (Uhler) ; New York ; 

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

 (Osten 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. 



Hab. 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- 



