LIBELLULA. 159 



brownish-black ; appendages yellowish ; wings hyaline, the apex 

 subfuscous, base of the- posterior ones ochraceous ; pterostigma 

 large, fulvons ; membranule fuscous. 



Male Adult. Mouth and front steel-blue ; body nigro-fuscous, 

 with a violet tinge, pruinose ; wings with a broad, blackish-fuscous 

 band, between the nodus and pterostigma ; pterostigma brownish- 

 black, the base of the posterior ones rufo-fuscous ; the apex of 

 each, often hyaline; 11 — 13 antecubitals ; 9 — 12 postcubitals ; 

 three discoidal areolets. 



Length 38 — 47 millim. Alar expanse 56 — 72 millim. Ptero- 

 stigma 4 — 5 millim. 



Hob. Georgia (Abbot), a single male in Hagen's collection; 

 Matamoras, Mexico, a single male in Hagen's collection ; Cuba 

 (Poey) ; Martinique ; St. Thomas ; Barbadoes ; Porto Cabello, 

 Venezuela; Surinam, Essequibo, Guiana; Bahia, Bio, Brazil; 

 Buenos Ayres. An extremely common species in tropical South 

 America. 



20. L. angustipennis ! 



Libellula angustipennis Ramb. Neuropt. 63, 42 ; Selys, Poey Ins. Cuba, 

 p. 446. 



Yellowish-red ; front pale, steel-blue above ; thorax fuscous, dor- 

 sum with three lines, the sides with two stripes and two lines, yel- 

 low ; abdomen triquetral, toward the apex narrower, fuscous, 

 dorsum with three yellow streaks ; the female has the eighth seg- 

 ment dilated at the sides ; feet blackish-fuscous, the anterior fe- 

 mora yellowish beneath ; wings hyaline, narrow, the apex subin- 

 fuscated; pterostigma long, fuscous ; membranule cinereous ; fifteen 

 antecubitals ; ten postcubitals ; two discoidal areolets. 



Length 40 millim. Alar expanse 68 millim. Pterostigma 4 

 millim. 



Hab. Cuba (Poey). Does it belong to this genus ? 



21. L. vibex! 



Libellula vibex Hagen ! 



Brownish-black ; labium yellow, with a triangular spot in the 

 middle ; front yellowish, chalybeous above ; thorax black, dorsum 

 with a yellow stripe in the middle ; sides with two stripes, and two 

 lines, yellow ; feet black, anterior femora yellowish beneath ; abdo- 

 men triquetral, black, slender, almost equal, the base with a short, 



