DYTHEMIS. 167 



black, the base each side with a maculose, green stripe, dorsum of 

 the seventh segment each side, with a lanceolate, long, green spot; 

 appendages black; wings hyaline, the anterior margin at base 

 subflavescent ; pterostigma small, black ; membranule black. 

 Male. 



Fifteen antecubitals ; ten postcubitals ; two discoidal areolets. 



Length 54 millim. Alar expanse 86 millim. Pterostigma 2 

 millim. 



Hob. Mexico (Vienna Museum). 



Similar to Libellula nubecula Kambur, but certainly distinct. 



11. D. aequalis ! 

 Dythemis aequalis Hagen ! 



Fuscous; mouth and front whitish-yellow; the vertex, and the 

 front above, chalybeous ; thorax brassy-fuscous, the dorsum each 

 side with an oblique streak, middle sulcus, and a transverse line 

 at the wings, yellow; the sides brassy-fuscous, with three broad, 

 irregular, yellow stripes; feet black, the extreme base fuscous; 

 abdomen shorter than the wings, slender, broader before the apex, 

 triquetral, brassy-fuscous, the base each side with a maculose 

 stripe, and the seventh segment each side with a large, cuneiform, 

 yellow spot; appendages black; anterior genital lamina each side 

 with a large, prominent auricle ; the harnule not prominent ; vulvar 

 lamina large, oval"; wings hyaline ; pterostigma oblong, black ; 

 membranule black. 



Adult Male. Thorax and base of abdomen pruinose. 



Female. Abdomen each side, with a broad, interrupted, yellow 

 stripe. 



Eight antecubitals ; six postcubitals; two discoidal areolets. 



Length 28 millim. Alar expanse 46 millim. Pterostigma 2 

 millim. 



Hal. Cuba (Poey) ; Matamoras, Mexico. 



12. D. naeva! 



Dythemis naeva Hagen ! 



Brownish-black ; mouth and front black, with two yellow spots 

 each side; front superiorly and the vertex, chalybeous; thorax 

 black, subpruinose, a little clothed with cinereous hair ; sides each 

 with oblique stripes, which are obsolete above, yellow ; feet black ; 

 abdomen shorter than the wings, slender, triquetral, hardly thicker 



