44 Rey. A. E. Eaton’s Monograph 
transfer it to a tube, or homceopathic globule bottle, 
partly filled with water. Next, Price’s glycerine is added 
to the water,—one or two drops a day,—until the bottle 
is gradually filled. A small drop of acetic acid may be 
added finally, to prevent the growth of mould. The 
name of the species may be written on the disk of the 
cork, the date and locality of capture round its side. 
Hind-wings of the species of Baetis and Centroptiluin 
should be mounted on slips of glass, for microscopical 
examination. Pinned specimens are often difficult to 
determine, in consequence of their shrinking ; to card 
them is to render them fit for nothing. 
GENERUM DISTRIBUTIO GEOGRAPHICA. 
Symbola ( ) species fossiles, [ ] nondescriptas, claudunt. 
Europa. |America.| Asia. | Africa. Peay Oceania. 
Oligoneuria ...... yy 1 0 iL 0 0 
Lachlania ......../ 0 1 0 0 1) 0) 
Campsurus......... 0) 6 0 (0) 0) 0) 
Asthenopus ........ 0 2+/1) |0 0 0 0 
Polymitarcys...... 1+ (1) | 0 1+-[2] | 1-+- (1) 0) 0) 
Palingenia ......... i @) 1 (0) 0) 0) 
Pentagenia......... 0) 2 0 0 0 0 
Hexagenia ........| O 5 [j 0 0) 0 
Euthyplocia ...... 0 il 0 0 0 to) 
Ephemera ......... 4 3+[1] | 4 0 0 0) 
Potamanthus .....| 2 0 0 0) @) 0) 
Leptophlebia I ...| 0 0 3 2 9 0 
3 IA) gaa} © 1 a) 0 ) 0 
oy UNE Seal Ze S| 0 0) 0 0 
ay | ANY cool © 2 0 0 @) 0) 
*) Waal 24 0 0 0 0 0) 
Genus [XIII] ...... 0 il 0 0 0 0 
Tricorythus ....... 0 0 0 i 0 0 
(OER) cognossobodacaa 6 2 il 1 0) 0 
Kphemerella ...... 3 2 0 0 0 0) 
Beetiscaeecussoteres 0 1 0) @) 0 0 
C@llocons.carecmecese 5 4, 1+(1]|1 [1] 0 
Centroptilum,,...| 4 1 0) 0) 8) (0) 
IBEN=) tS) nqoooasgo90000C 16 13+-[2}/ 1 +f) / (4) [2] 0 
Silallviets) Goosnoncc 3-+[2] | 7? 0 0 0 0 
Genus [XXII].....| 0 0 5 0 0 0 
Isonychia ......... 0 1+?1 |0 0 (0) 0) 
Coloburus ......... 0 0 0) 0 2 0 
(Cronicus) ......... (1) 0 0) 0 0 0 
2 0 te) 2 
Heptagenia ...... 20 16 
