386 Dr. Hagen's and the Rev. A. E. Eaton's 
species. In the Museum here are very few EjjhemeridcB 
besides mine and some good things from Hudson's Bay 
and New England. [His collection contains also types of 
the Corsican and Sicilian species (Hag. 1860, 1864) and 
a few others from Burmeister (1839) and Zetterstedt 
(1840). These last two sets have been noticed above in 
the notes referring to p. 10 of the Monograph ; the other 
tAvo sets will be treated of beloAv in the notes referring to 
the descriptive portion of the Monograph, where also 
series of specimens fi-om Cornelius, Imhoff and others 
contained in his collection will be particularized.] 
Page 13. 1857. — Brauer. In continuation add ; & 74 
bis. Pot. mesoleucus. 
Page 14. 1864. — Cornelius in Correspondenzbl. d. 
Vereins f. preus. Rheinlands, T. xxi. pp. 69 — 71, gives an 
interesting account of the apparition of Pal. longicauda. 
Page 15. 1864. — Your reduction of the Corsican 
species described by me is apparently en*oneous. [See 
below, note on p. 155 of the Monograph.] 
Page 15. 1865. — Etn. [I have succeeded in verifying 
my conjecture that the female of Baetis enters the water 
sometimes for the purpose of oviposition. See below, note 
on pp. 118, 119 of the Monograph.] 
Have you read the story of Ephemera by an old man, 
told by Ben. Franklin ? A figiu-e of an Ephemera in an 
old Chinese book is mentioned in Naturforscher, Stiick 
vii. p. 30. Goetze, Beytrage, p. 204, confirms the obser- 
vations of Schaeffer, and says that the same sjjecies lives in 
France (Seine, Marne), Germany (Donau, Main). He 
gives an interesting observation on the rearing of the 
insect. Hadrian Junius, in his Nomenclator, p. 84, 
gives only four words. 
Page 17, line 13. [After ? add = Polymitarcys.'\ 
Page 18, line 26. [Dele zehrata. ] 
„ line 32. [Dele ? ; and before $ im. insert = 
undatus.^ 
Page 18, line 39, end. [Add = undatus ? im.] 
„ line 44. [Dele zehrata.'] 
