116 NEL'ROrTERA OF NORTH AMERICA. 



a fuscous band in front ; thorax brownisli-black, dorsum each side 

 with n cuneiform stripe, sides with two oblique stripes, yellow; feet 

 black, femora fuscous, the apex black; abdomen long, brownish- 

 black, segments 2 — 6 with a dorsal, yellow spot each side ; vulvar 

 lamina long, bifid, yellow, fuscous at the apex ; wings hyaline, 

 pterostigma yellow, membranule white. Female. 21 antecubitals; 

 15 postcubitals ; 2 discoidal areolets. 



Length 75 millim. Alar expanse 93 millim. Pterostigma 4 

 millim. 



Huh. Georgia ; Maryland (Uhler) ; Connecticut (Norton). 



3. C. dorsalis ! 



Cordulcgaster dorsalis Hagen ! Monog. Gomph. 347, 115. Selys ! Addit. 

 Synops. 28, 113 bis. 



Fuscous, spotted with yellow; head yellow, with a fuscous band 

 in front ; thorax fuscous, dorsum each side with a stripe, sides with 

 two oblique ones, yellow; feet blackish-fuscous, femora luteous; 

 abdomen long, fuscous, segments 2 — 9 with a dorsal, bifid, yellow 

 spot ; vulvar lamina long, bifid, luteous ; wings hyaline, the 

 base subfulvous, pterostigma yellow, membranule white. Female. 

 Eighteen antecubitals ; twelve postcubitals ; two discoidal areo- 

 lets. 



Length 80 millim. Alar expanse 100 millim. Pterostigma 4 

 millim. 



Hah. Sitka, Russian America. 



4. C. obliquus! 



^schna obliqua Say, Jour. Acad. Pliilad. VIII, 15, 8. — Cordulegaster ob- 

 liquus Selys! Monog. Gomph. 349, IIG ; pi. xviii, fig. 5. Selys! 

 Synops. 89, 113. — Cordulegaster fasciatus Ramb. ! Neixropt. 178, 1. 



Black, spotted with greenish-yellow; head yellow, in front with 

 two black bands, occiput tuberculoid; thorax black, with gray 

 hairs, dorsum with a cuneiform stripe each side, and sides with two 

 oblique stripes, yellow; feet black, base of the femora fuscous; 

 abdomen long, equal, black, dorsum with a greenish-yellow line 

 upon the middle, which is dilated in the middle upon segments 

 5 — 8 ; appendages black, superior ones short, trigonal, acute, with 

 a basal tooth beneath; the inferior one quadrangular, the apex 

 tuberculated each side ; vulvar lamina short, bifid, yellow, black at 

 the apex; wings hyaline, pterostigma long, fulvous, membranule 



