Head small, squarely, little eyes situated on both sides of the 

 occiput, Antennae little longer than the middle of the body. (Fig. 

 2, a.) 



Pronotum short, depressed, broader than the head, rounded 

 vith a light stripe. 



Abdomen as broad as the thorax till to 0th segment. Each seg- 

 ment on both margins dorsi-ventral depressed but rounded, without 

 any spine. (Fig. 2. a.) 



Gills on segments 1 — 7, double, divided into two long, 

 simple tapering filaments, quite similar to the Habr. modesta, only 

 slenderer and longer. Tracheal branches in both filaments simple, 

 not ramified. (Fig. 2, b, c.) 



Cerci densely segmented. Every segment except the four basal 

 with a crown of long, fine hairs. (Fig. 2. d.) 



Mouth parts are the same like at Leptophlebia vespertina or 

 cincta and I delineated therefor only hypopharynx and mandibuUa. 

 (Fig. 2, s, f.) 



The nymph lives in brooks and rivers with nmddy bottom 

 covered with water-plants in the whole land.") 



I am obliged to add some words about the systematic distribution, which 

 accepted Lestage in his monograf (Larves des Ephemeres pelearctiques 1917. 



He divided the genus Leptophlebia into Leptophlebia and Paraleptophle- 

 bia. using for the generic charal<ter tiie form of tracheal gills: 



L Branchies semblables, formées de simples filaments bi ou pluriramifies- 



A. — Branchies formées d'un double filament long, étroit, grêle pédoncule 

 a la base, cerqe 2 fois plus long que le corps, 



Paralepiophlebia (cincta, submarginata). 



B. — Branchies formées d'un ccsurte tige pluriramifies en longs filaments 



ciliés, cerques pas plds longs que le corps. 

 Habrophlebia {fusca, modesta etc.). 

 II. Branchies dissemblables, la ire paire rudimentaire, les 6 paires suivantes 

 formées de 2 lamelles foliacées. 



Leptophlebia {marginata, vespertina etc). 

 According to that table I would be obliged to put both even describe- 

 nymphs into the genus Paraleptophlebia. But also superficial comparison show, 

 evidently that they are not at least related. 



Just on the contrary. The mouth parts and other system, characters prove 

 that s. c. Paraleptophlegia submarginata is closely related with Leptophlebia 

 vesperttna and cincta and on the other side Paraleptophlebia modesta \\ith 

 Habrophlebia fusca. 



For that reason I kept the old distribution and nomenclature. 



81 



