58 Inuinois Narurat History Survey BULLETIN 
mens that could be assigned to this species. 
It may be noted, however, that the streams 
around Rock Island are today quite different 
than they were in Walsh's time. The geno- 
type, excrucians, also described from Rock 
Island and not found to occur there now, 
has recently been located and reared in 
northern Michigan. 
AURIVILLII 
DEFICIENS 
Fig. 127.—E phemerella ora, male genitalia. 
Fig. 128.—Ephemerella serrata, male genitalia. 
Fig. 129.—E phemerella fratercula, male geni- 
talia. 
we 130.—Ephemerella aurivillii, male geni- 
talia. 
Fig. 131.—Ephemerella needhami, male geni- 
talia. 
Vol. 26, Art. 1 
Examination of the lectotype of Cloe que- 
becensis Provancher (1876:267), now de- 
posited in the Provincial Museum, Quebec, 
shows that the species was described from a 
female specimen of the genus Ephemerella. 
This species was transferred by Provancher 
to Heptagenia the year following its de- 
scription (1878:127). At the present state 
DOROTHEA 
INVARIA 
SEPTENTRIONALIS 
Fig. 132.—Ephemerella dorothea, male geni- 
talia. 
pe 133.—Ephemerella deficiens, male geni- 
talia. 
Fig. 134.—Ephemerella septentrionalis, male 
genitalia. (After McDunnough.) 
aoe 135.—Ephemerella invaria, male geni- 
talia. 
