EPHEMERIDA. 
11 
A single larva was found. It agréés in ail parts completely witli the larva frora 
Denmark. 15. VIL 09 Ж 49, at the tundra of Kara. 
Siphlurus sp. 
5 larva were found of a species 
of Siphlurus. I do not venture to 
regard them as belonging to any of 
the known imagines. I bave seen the 
larva of Siphlurus Linnaeanus from 
Sweden. 
22. VII. 09 Ж?. 62, near the 
moutb of tbe Kara river. 
Metretopus norvegicus Eat. 
Tbe larva of this species also is 
described by Bengtsson. 
Nymph. Head small, only half 
as wide as tbe mesothorax. Ocelli 
large; front greyisb yellow with yellow 
middle line. Thorax, wing sheaths 
and abdomen grey-yellow. On thorax 
a few small browmish dots are present. 
Fig. 16. Metretopus norvegicus Eat. Nymph. a Labrum, 
b Labium. 
On the wing sheaths is seen a dark line folio wing 
a 
Fig. 17. Metretopus norvegicus Eat. Nymph. 
a Left mandible, b Left maxilla. 
Fig. 18. Metretopus norvégiens Eat. Nymph. 
a 7th trachéal gill, b Hind leg. 
JUN 
