MARKINGS OF THE SPECIES 27 

 The nymph shown is a male Ephemera danica. Mayfly- 



I made an attempt a year or so ago to rear 

 this species in an aquarium containing a varied 

 assortment of EPHEMERID.E, TRICHOPTERA, 

 shrimps and snails. I kept the larvae alive for 

 some months, and was much interested in watch- 



nymph. 



1 3 



FIG. 3. Dorsal markings of: 



I. Ephemera vulgata. 2. Ephemera lineata. 



3. Ephemera danica. 



ing their method of locomotion. The sand and 

 grit on the floor of the aquarium would heave, 

 as if a miniature earthquake were taking place, 

 and presently a head and flank would appear 

 pressed against the glass as the nymph made 

 its way along, parallel with the side of the 

 aquarium, several inches beneath the soil. 

 From time to time a nymph wpuld come 



