23 



a reddish tinge), becoming darker towards their hind 

 margin, which as the front margin is bordered with yel- 

 wish white. The stigmatæ are enclosed by a dark oblique 

 spot, most distinct in the three apical segments. The 8th 

 and 9th segments without yellowish white borders. The 

 venter of abdomen paler than the dorsum; the 2 or 3 api- 

 cal segments with a strongly yellowish red tinge and 

 with a more or less darker marking in the centre of the 

 segments. Forceps dark brown. The setæ dark brown 

 with indistinct blackish annulations at the joinings. Legs 

 (held up against the light) pa]^ yellowish brown with 

 blackish knees, blackish apex of tibiæ and tarsal joints, 

 and with a brownish red band in the middle of the fe- 

 moræ. Wings hyaline with dark brown nervures (especial- 

 ly the costa, subcosta and radius in the fore wing). The 

 cross veins in this area are crossed or forked. 



5 . The thorax and the abdomen paler than in the 

 male. 



Lenght of body S 7 — 11 mm; fore wing 9 — 12 mm; 

 setæ 29 mm. Length of body 2 7 — 10 mm; fore wing 

 10 — 12,5 mm; setæ 14 mm. 



Several males and a few females were present. The 

 species has some likeness to Rhithrogena alpestris Eat.; 

 but the distinctly banded femoræ and the yellowish mar- 

 ginal area with the darker pterostigmatical region make 

 it easely recognizable. 

 Ecdyurus corsicus Peters. (Ent. Medd. København, 

 1912, pag. 351). Several specimens of this species were 

 present. 



Ecdyurus fallax Hag. Two males and two females, 

 all in poor condition, were present in the collections. The 

 species is hitherto only known from Corsica (Hagen) 

 and from Sardinia (Costa). The specimens agree very 

 well v/ith the descriptions given by H a g e n and Eaton. 

 In the female the venter of ninth segment is very much 

 prolongated and formed as a spout. 



