F^SYCHE 



DESCRIPTIONS OF SOME NORTH AMERICAN CORDULINA. 



BY HERMANN AUGUST HAGEN, CAMBRIDGE, MASS. 



[ With Plate /.] 



I. Epitheca yamaskanensis. 



Aeschna ya?naskanensis Provancher 

 Natiir. Canad. 1875, v. 7, 238 ; 248. 



Epitheca yamaskanensis Prov. ibid. 

 1S77, V. 9, 86. — Selys, 2d Add. syn. 

 Cordul., 1878, 13, 20, 12. 



Male. Olive brown ; front and ver- 

 tex brown, blackish pilose, strongly 

 punctated ; front excavated above ; la- 

 brum yellow, labium pale ; antennae 

 blackish ; vertex convex above, nar- 

 rowed to tip, which is half as broad at 

 the base, nearly straight, a little im- 

 pressed ; occupit yellow, brown on tip, 

 whitish pilose behind ; yellow behind the 

 eyes, two transversal brownish marks in 

 the middle. Thorax olive brown, 

 densely brownish pilose ; dorsum dark 

 brown, paler olive at the humeral suture 

 and below the blackish brown sinus ; 

 carina obscure yellowish ; sides olive 

 brown ; a yellow spot around the stigma ; 

 below pale brown. Abdomen long, 

 slender, inflated at the base, contracted 

 on third segment, gradually broader to 

 tip ; third segment paler at base ; seg- 

 ments 4-9 with a long yellowish spot on 

 each side ; transverse sutures black ; ar- 

 ticulation membrane yellowish ; earlets 



moderate, dark brown, shining, round, 

 pointed behind ; last segment short, pale 

 brown ; a small doi^sal carina not reach- 

 ing the apical margin, which is pro- 

 longed into a triangular lobe between 

 the superior appendages ; base of the 

 last segment notched ; the articulation 

 membrane enlarged. Superior append- 

 ages three times as long as the last 

 segment, black, pilose, approximated, 

 basal half cylindrical, about straight, 

 somewhat contracted just after the base, 

 apical half suddenly enlarged externally, 

 a little divergent, the external border 

 rounded, tapering to a short acute tip, 

 recurved a little inwards and upwards ; 

 viewed from the sides, the basal half is 

 cylindrical, a little incurvate, the apical 

 half suddenly increased, tip recurved, 

 acute ; an obsolete external ridge not 

 reaching the tip begins where the ap- 

 pendages enlarge and here on the under- 

 side is also a small notch. Inferior ap- 

 pendage a little shorter, light brown, tri- 

 angular, large at base, very much nar- 

 rowed and recurved on the apical half, 

 ending in a blunt tip, somewhat thicker 

 above. Genital parts on the second seg- 

 ment compai-atively small ; ventral lobe 

 black, leaf shaped, margin thickened 



