72 
Psyche 
[March 
Table 2. Data from complete disassembly of 19 M. gregalis webs or subunits of 
webs (census Method No. 1, see text). Area and volume are estimates, since borders 
of webs were irregular. Small immature: ca. 1 mm in body length (color: uniformly 
brown). Large immature: body length ca. 2 mm (gray markings present on body). 
Adult females: ca. 3 mm. Adult males: ca. 3 mm. Web class A: 3-D and lacking 
evidence of deserted areas. B: 3-D and containing conspicuous deserted areas. 
C: 2-D and lacking conspicuous deserted areas. D: 2-D (but not as flat as C) and 
containing conspicuous deserted areas. E: 3-D, small discrete web on irregular 
substrate. A-D: census areas were subunits of large webs, except for some of C 
that were discrete webs. 3-D: web occupies relatively much space in each of 3 dimen- 
sions. 2-D: web confined predominately to 2 dimensions (“flat”). “Deserted” areas: 
no longer occupied by M. gregalis, not substantially adhesive, and covered by fly 
carcasses and dust. Note: as population size increases, composition of population 
shifts toward decreasing percentages of females and increasing percentages of im- 
matures. Kendall rank correlation (Sokal and Rohlf, 1969) for increasing percent- 
ages of small immatures with increasing population size (P < 0.001). 
Popu- 
Area 
Volume 
lation 
(cm 2 ) 
(cm 3 ) 
1 
144 
144 
2 
144 
144 
3 
105 
300 
4 
150 
300 
5 
144 
144 
6 
75 
150 
7 
70 
150 
8 
70 
350 
9 
150 
150 
10 
70 
350 
11 
144 
144 
12 
70 
350 
13 
64 
320 
14 
150 
600 
15 
155 
155 
16 
100 
300 
17 
400 
800 
18 
45 
225 
19 
150 
600 
Sex/ 
Web 
Popu- 
lation 
Adult 
Class 
Size 
Female 
C 
5 
60.0 
C 
7 
71.4 
c 
9 
0.0 
D 
10 
90.0 
D 
10 
30.0 
B 
11 
27.3 
B 
21 
19.0 
A 
23 
65.2 
B 
25 
4.0 
A 
27 
48.2 
C 
31 
12.9 
E 
34 
11.7 
B 
40 
27.5 
A 
47 
23.4 
D 
53 
32.1 
A 
74 
17.5 
A 
82 
9.7 
A 
114 
7.0 
A 
288 
9.3 
Age Class Composition 
(%) of Population 
Large 
Small 
Adult 
Imma- 
Imma- 
Male 
ture 
ture 
0.0 
20.0 
20.0 
0.0 
14.2 
14.2 
11.1 
44.4 
44.4 
10.0 
0.0 
0.0 
0.0 
10.0 
60.0 
0.0 
27.3 
45.4 
0.0 
19.0 
61.0 
17.4 
17.4 
0.0 
4.0 
8.0 
84.0 
18.5 
7.4 
25.9 
0.0 
0.0 
87.0 
5.8 
32.3 
50.0 
0.0 
40.0 
32.5 
6.3 
21.3 
48.9 
0.0 
20.7 
47.2 
1.3 
22.2 
55.4 
2.4 
7.3 
80.4 
0.0 
12.3 
80.4 
2.0 
9.7 
78.8 
