Description of a new species of Epheme 

 rida from Denmark. 



m 



Esben Petersen, 



iSilkebori;. 



Rhithrogeua Ussiugi n. sp. (^. The eyes above greyish 

 brown, divided by a bluish band, black below. Notum light 

 brown anteriorly, pitchy brown posteriorly. Abdomen above 

 light brown with the joinings of the intermediate segments 

 lighter. Segments 8—10 darker, and the last segment with 

 two longitudinal black streaks. Venter of abdomen lighter 

 than the dorsum and of a uniform colour. Wings hyaline. 

 Costa and subcosta greyish yellow-brown; the other longi- 

 tudinal nervures and the cross nervures brown. The margi- 

 nal and submarginal areas slightly tinged with greyish yellow 

 becoming darker in the pterostigmate region. Fore legs 

 broAvn ; knees darker, and tibiæ darker at the tip. Femoræ 



with a distinct dark band. 

 Femoræ and tarsi of interme- 

 diate and hind legs brownish 

 yellow: tibiæ yelloAv. Femoræ 

 with a longitudinal dark streak 

 on the outside as well as on the 

 inside. Limbs of forceps brown. 

 Penis yellow. Setæ light 

 greyish brown at the base, 

 lighter towards the tip. At 

 the base with hardly visible 

 Forceps of Rh. Ussingi brownish joinings. L. 10 mm. 



(From below,. V. 10 mm; Setæ 22 mm. 



