1901.] 



258 



Leptophlebia marglnata, Lin. (Stepli.) — Ulefos, 3 ex. ; Gjolsjaen, 1 ex. ; Hanimerd, 



1, and Lodingen, 3 ex. 

 Leptophlebia Me^eri, Ktn. (vesper/ itia, h. ?) —^k'leu, 52 ex.; Gjolsjilen, 47 ex.; 



Aal (? 3 ex.), a ? subini., I 9 im. and 1 ^ iin. in bad preservation. 



Leptophlebia Steandii, sp. nov. (fig. I and a). 



Subimago (in alcohol).-- Wings uniformly grey, thus differing from L. Meyeri, 

 in which the hind-wings are impure whitish. 



Imago (in alcohol). — Body similar in colouring to L. Mei/eri ; the veinlets of 

 the pterostigmatic space of the fore-wings numerous and curved, apparently simple 

 as a rule. Distinguishable by the remarkable flexure of tlie basal joint in the 

 forceps-limbs, and by the shape of the penis (see fig. annexed), the lobes of which 

 diverge slightly and are obliquely truncate at their tips, with the ventral apical 

 angle acute. In the absence of living or dried specimens, it seems inexpedient to 

 enter further into particulars of colouration. 



Length of wing, S 7'5, ? 7"5 — 9: sette, t? im- f, subini. 7'5, ? 7'5 — 9 mm. 

 Hab.: Aal (Strand), 140 ex. 



Figs, of details x 62 diarns. in the original drawings: — ], partial lateral profile 



of the last abdouiinal segment of (Jim., 

 with penis and forceps-limb in situ ; a, 

 penis detached, viewed under slight 

 pressure from above (not, as usually 

 --een, from behind or below) ; the spurs 

 indicated (all but their points) by 

 dotted lines showing througji the sub- 

 transjiarent substance of the lobes. 

 Baetis vernus, Curtis — Hatfjelddalen, 



289 ex. 

 Baetis rhodaiii, Pict. — Laerdalsoren, 

 3 ex. ; Aal, 2 ex. 



Specimens of undetermined species of Baetis in the collection : — Gjolsjaen, 2 

 ? im. ; Aal, 1 ? subim. ; Hammerd, 1 J subini., 1 9 im. and 1 subim., also 3 ^ 

 subini., 1 9 im- and 1 subim. ; Tysfjorden, 2 ^ subim., 1 9 im., 4 subim., also 1 

 9 subini. 



Chirotonetes sp. . — Hatfjelddalen, 1 $ subim. 



Ameletus inopinatus, Etn.— Hatfjelddalen, 2 <? subim., 1 9 im. 

 Siphlurus lacustris, Etn. (?). — 1 ^ im. 



Siphlurus Linnceanus, Etn. --Aal, — 13 ex. ; ? Hatfjelddalen, 1 9 subim. This spe- 

 cies had previously no known locality. 



Siphlurus sp. . — Hatfjelddalen, 1 ^ im. (immature, the subimaginal " slough 



having been denuded by friction in transit), 3 subini., 1 ? im., 1 subim. An 

 undescribed species. 



METRETOPUS,* gen. nov. 



Distinguished from Ametropus (Etn. MS. ; Albarda, 1878) by the median 

 caudal seta being atrophied to a pauci-articulate rudiment, and by the tibia; being 

 less short in comparison with the tarsi. Fore tarsus of ^ about thrice the length 



*Etiimology — Metretos and fons, measurable foot (with regard to Ametropus). 



