156 NETJROPTERA OF NORTH AMERICA. 



die, black ; dorsum of the thorax rufous, the median sulcus yellow ; 

 the sides greenish-white, beneath terminated with black ; abdomen 

 long, narrow, triquetral, yellow, the base greenish-white, a dorsal 

 stripe, and another each side at base, shorter, and the sutures, 

 black ; appendages black ; feet black, base of the femora yellow- 

 ish ; wings hyaline, a short basal line, a nodal point, and the apex, 

 blackish-fuscous; pterostigma large, black; membranule cinereous. 



Adult Male. Thorax above, pruinose. 



IT 20 antecubitals ; 15 It postcubitals ; four discoidal are- 

 olets. 



Length 58 61 millim. Alar expanse 100 millim. Pterostigma 

 t millim. 



Hob. New Orleans, Louisiana ; Georgia ; Virginia. 



14. L. axillena ! 



Libellula axillena Westwood. Duncan, Introduct. 292, pi. xxix, fig. 1. 

 Libellula lydia Ramb.! Neuropt. 55, 32 (in part). Libellula leda Say, 

 Jour. Acad. Philad. VIII, 22, 8. 



Similar" to Lib. lydia, but differs from it by the male having the 

 front and labrum black, carbonareous, front metallic-blue above ; 

 of the female, the labium and rhinarium black, the front reddish- 

 yellow, above metallic-blue ; tip of the vertex yellowish ; feet 

 black, the base of the femora hardly rufous ; the dorsal stripe of 

 the abdomen reaching to the thorax ; a stripe upon the anterior 

 margin of the wings, between the nodus and pterostigma, blackish- 

 fuscous. 



Length 50 60 millim. Alar expanse 80 92 millim. Ptero- 

 stigma 6 7 millim. 



Hob. Georgia ; New Orleans, Louisiana ; Florida (Osten 

 Sacken). 



Is it a variety of L. lydia ? 



15. L. flavida ! 



Libellula flavida Ramb.! Neuropt. 58,35. 



Reddish-yellow ; mouth, front and tip of the vertex, pale yellow ; 

 thorax rufous anteriorly, the median sulcus yellowish ; the sides 

 yellowish-white, with an oblique fuscous stripe ; abdomen long, 

 triquetral, yellow ; a dorsal stripe, another at base, each side, and 

 the sutures, brownish-black ; the inferior appendage pale ; feet 

 black, anterior femora yellowish beneath ; wings hyaline, the ante- 



