490 Wisconsin Academy of Sciences, Arts, and Letters. 
Table 12. Average weight in milligrams of a single individual of Co- 
rethra punctipennis, together with the percentages of water and ash. 
Form 
Month 
Lave 
Weight, 
Milligrams 
Dry 
Weight, 
Milligrams 
Percentage 
of 
Water 
Percentage 
of 
Ash 
Larva ... 
February... 
3.06 
0.250 
91.72 
7.06 
May.-.... 
3.30 
0.264 
92.12 
7.96 
June. 
3.15 
0.311 
89.13 
7.33 
September.. 
2.57 
0.182 
92.93 
9.53 
October. 
2.83 
0.264 
90.66 
8.62 
November... 
3.20 
0.285 
91.03 
8.10 
Pupa .. 
June........ 
3.52 
0.574 
83.71 
5.80 
Adult .... 
June.. 
0.75 
0.427 
43.32 
5.89 
Table 13. The average number of larvae of Protenthes choreus per 
square meter of bottom during the different months of the year. The first 
line shows the averages for the five stations in deiep water and the second 
line the averages for station I. 
January 
s 
I 
March 
April 
May 
i 
§ 
H 
July 
August 
September 
October 
I 
> 
o 
J25 
December 
Deep water .... 
105 
571 
187 
400 
380 
327 
85 
50 
17 
27 
140 
338 
Station I ...... 
1,220 
1,020 
380 
750 
584 
250 
157 
81 
48 
374 
1,330 
Table 14. Live weight and dry weight of the larvae of Protenthes 
choreus, together with the percentages of water and of ash. The weights 
are stated in milligrams per individual. 
Date 
Length, 
Millimeters 
Live 
Weight, 
Milligrams 
Dry 
Weight, 
Milligrams 
Percentage 
of 
Water 
Percentage 
of 
Ash 
June-November, 1917 .... 
9-10 
4.76 
0.700 
85.4 
7.58 
December 21, 1917........ 
5-10 
1.07 
0.190 
82.3 
5.63 
February 24, 1918........ 
6-10 
1.26 
0.205 
83.8 
5.69 
May 13, 1918..... 
1.52 
0.270 
82.3 
7.31 
June 10, 1918......... 
1.92 
0.323 
83.2 
6.78 
