WATER CONTENT AND RATE OF METABOLISM 
143 
be noted that the average percentage of water for the adult 
males of Melanoplus f. riibrum tends to be slightly higher than 
that for the females, and that for Dichromorpha viridis the 
reverse relation is found. 
TABLE 1 
Showing the percentage of water in -normal grasshoppers of different species. 
Figures in ( ) giving the number of animals used 
PERCENTAGE OF WATER 
BODY 
WEIGHT 
Melanophus f . 
rubrum (nymphs) 
Melanophus f . rubrum 
(adults) 
Dichrcmoipha viridis 
(adults) 
Melanophus differ- 
entialis (adults) 
& 
? 
cf 
9 
cT 
9 
& 
9 
grams 
0.10-0.15 
0.15-0.20 
0.20-0.25 
0.25-0.30 
0.30-0.35 
0.35-0.40 
0.40-0.45 
0.45-0.50 
0.50-0.55 
0.55-0.60 
0.60-0.65 
0.90-1.10 
1.10-1.30 
1.30-1.50 
1.50-1.70 
1.70-1.90 
1.90-2.10 
2.10-2.30 
2.30-2.50 
2.50-2.70 
2.70-2.90 
76. 7( 8) 
75.0(10) 
74.8(13) 
78.5(11) 
77.9(14) 
74.1(15) 
73.9(10) 
74.4(12) 
74.9(7) 
74.2(19) 
73.6(32) 
73.4(47) 
73.9(19) 
76.0(25) 
74.1(40) 
74.5(45) 
72.5(23) 
70.8(12) 
73.1(14) 
71.2(27) 
71.1(13) 
70.3(18) 
69.8(34) 
64.9(15) 
75.1(25) 
74.3(15) 
74.3(40) 
73.3(42) 
71.8(50) 
68.4(57) 
67.9(40) 
65.4(20) 
66.7(18) 
69.3(15) 
69.6(11) 
69.7(10) 
66.8(12) 
71.0(25) 
69.2(18) 
69.0(10) 
69.4(34) 
69.9(27) 
69.3(19) 
Average. 
75.5(41) 
75.7(62) 
74.0(124) 
72.6(217) 
67.3(49) 
70.8(307) 
69.4(26) 
68.0(155) 
h. Specific differences. It will be noted from table 1 that the 
average percentage of water differs for the various species studied. 
For example, jVIelanoplus f. rubrum has an average water 
content of 74.4 per cent, Dichromorpha viridis 69 per cent, and 
JMelanoplus differentialis 68.9 per cent. These averages (except 
