1912] Ephemeride Nymphs Heptagenia Inter punctata 39 
I II III IV Vv VI VII VIII IX x 
1mm. /} 1.5mm. | 2.6 mm. 3 mm. 4mm. 5mm. 6 mm. 7mm. 8mm. 9 mm. 
Nov. 7] Nov: 8 | Nov. 7| Nov. 9 | Nov. 8 | Nov. 10 | Nov. 6] Nov. 8] Nov. 9] Nov. 10 
Nov.22|. Nov. 20 | Nov. 20 | Nov. 22 | Nov. 20 |} Nov. 21 | Nov. 18 | Nov. 18 | Nov. 20 | Nov. 20 
Dec. 3} Dec. 1 | Dec. 1 Dec. 4] Dec. 1] Nov. 30 | Nov. 30 | Nov. 30 | Nov. 30 | Dec. 1 
Dec.f9 | Dec. 13 | Dec. 13 | Dec. 15 | Dec. 12 | Dec. 9} Dec. 8 | Dec. 7] Dec. 9] Dec. 12 
Dec. -28 | Dec. 23 | Dec. 23 |-Dec. 22 | Dec. 22 | Dec. 21 | Dec. 18 | Dec. 19 | Dec. 30 
jem. 16) || Ie, Gay Weis ei Ih Ter ey |) Weve a femal CEN) ese He || ere 3 
Janee23e\ Jane 220s lane dom |\elanel6n | Jan. e26) yang 205 jane 8! | yan 16 
Feb. 10 | Jan. 29 | Feb. 2| Feb. 10| Feb. 6 
Feb. 12 | Feb. 16 | Feb. 23 
Mar. 5 Feb. 26 | Feb. 28 
Mar. 21 | Mar. 4] Mar. 12 
pesoydioureyzayy 
pesoydiowrryayy 
April 3 | Mar. 28 
pesoydioweyzay 
April 18 | April 13 
pesoydiowlezoyyy 
lMay 4.| April 29 
May 19 | May 16 
poesoydioureyzayyy 
June 2 | May 30 | 
June 17 June 16 
Just how long //. interpunctata live I am not entirely certain, 
as I have been unable to keep any specimens throughout their 
whole life history. However, there seems to be sufficient 
evidence that their life extends through a period of two years. 
In the observation on moulting careful measurements were 
made of all the specimens after each successive moult. From 
these data the entire life cycle can be inferred. For example, 
specimen I which was one mm. long November 7, was one and 
one-half mm. long December 3; specimen II, one and one-half 
mm. long November 8, was two and one-half mm. long Decem- 
ber 13; specimen III, two and one-half mm. long November 7, 
was three mm. long January 23; specimen IV, November 9, 
was three mm. long, or the same length as specimen III had 
attained when its record ceased, was seven mm. long in June. 
