336 THE CANADIAN ENTOMOLOGIST. 



pectinations. Setae well fringed with hairs along middle, almost 

 bare at base and tip; each two alternate segments brown. 



The nymphs were taken almost everywhere about Go-Hom.e 

 Bay from May 29th to June 19th, in quiet water. Mr. R. P. 

 Wodehouse gave ms specimens from various places around Georgian 

 Bay, including Shawanaga Bay, Penticost Island, French River 

 and Sturgeon Bay. 



Ephemerella lineata sp. nov. 



Female imago: 



Measurem.ents — Body 9 mm. ; setae 14 mm. ; wing 10.5 mm. Very 

 similar to female of E. lutidenta, but has a rusty brown median 

 longitudinal stripe on dorsal surface of abdom.en. In a fresh speci- 

 men the stripe would probably extend over the thorax, and thus 

 correspond to the stripe of the nymph. No male specimens were 

 reared . 



Nymph (PI. V, fig. II): 



Measurements — Body 10 mm.; setae 6 mm. Slightly smaller 

 than E. lutidenta, but very similar in colour, except that there is a 

 dorsal median longitudinal white stripe from the anterior margin 

 of the pronotum to the posterior margin of the 10th abdominal 

 segment. This scnpe lies between the double row of spines on the 

 abdomen. Occipital tubercles slightly longer than those of pre- 

 ceding species. 



The nymphs were not very abundant, but were found in 

 about the sam.e localities as E. lutidenta, from June 3rd to July 9th. 

 My bred specimens are dated June 14th and June ISth. 

 Ephemerella bicolor sp. nov. 



Male imago: 



Measurements — Body 5-6 mm.; wing 6 mm.; setae 8-9 mm.; 

 fore leg 6 mm. A small brown species, very similar to E. lutulenta 

 in form and structure, but very much smaller. The size, appar- 

 ently, is the only character by which to distinguish it. 



Female imago: 

 Slightly larger than male. 

 Nymph: (PI. VI, fig. 3.) 



Measurements^Body 6-6.5 mm.; secae 3 mm. These nymphs 

 show a great variation in colour pattern. The light-coloured 



