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Psyche 
[Vol. 93 
Table 1. Measurements of ten females and ten males of Gladicosa gulosa from 
Allegan Co., Michigan. 
Females: 
Mean SEM 
Mean SEM 
Ant. Eye Row 
.985 ± .023 
Femur I 
4.26 ± .06 
PME 
1.218 ± .016 
Pat. -Tibia I 
5.50 ± .09 
PLE 
1.623 ± .020 
Meta. I 
3.13 + .05 
POQ 
1.138 ± .015 
Tarsus I 
1.86 + .03 
Car. Width 
4.36 ± .08 
Total I 
14.74 + .22 
Car. Length 
5.88 ± .09 
Femur IV 
4.92 ± .08 
Body Length 
13.18 +.49 
Pat. -Tibia IV 
5.77 ± .08 
Pat. -Tibia II 
4.96 +.09 
Meta. IV 
5.40 ± .07 
Pat. -Tibia III 
4.37 +.08 
Tarsus IV 
2.34 ± .02 
Total IV 
18.44 + .24 
Males: 
Mean SEM 
Mean SEM 
Ant. Eye Row 
.900 ± .025 
Femur I 
4.13 ± .06 
PME 
1.141 ± .021 
Pat. -Tibia 
5.46 ± .09 
PLE 
1.503 ± .028 
Meta. I 
3.46 ± .06 
POQ 
1.049+ .018 
Tarsus I 
1.89 ± .03 
Car. Width 
4.14 +.06 
Total I 
14.93 ± .23 
Car. Length 
5.50 +.12 
Femur IV 
4.63 ± .08 
Body Length 
11.46 +.30 
Pat. -Tibia IV 
5.50+ .10 
Pat. -Tibia II 
4.79 +.08 
Meta. IV 
5.27 ± .08 
Pat. -Tibia III 
4.18 +.07 
Tarsus IV 
2.33 ± .05 
Total IV » 
17.73 ± .30 
Natural History. Kaston (1948) reports gulosa running over 
dead leaves on forest floors in Connecticut. I have found it in leaf 
litter of deciduous woods in Michigan. Here it is found in more 
open Oak woodlands as opposed to the shaded floor of Beech- 
Maple forests. In Michigan and New England gulosa usually 
matures late in the fall, overwinters as an adult, and mates in early 
spring. Kaston (1936) made the following observations of courtship 
behavior in the species: 
Immediately upon coming in contact with the female, or 
within 3 minutes thereof, the male begins to drum his palps 
rapidly against the floor of the cage. These drumming move- 
ments are made so rapidly that a distinct purring or humming 
sound can be heard. The palps are used alternately and are 
raised only a very short distance during the process. The body 
is held at an angle so that the posterior end of the abdomen 
almost touches the floor. As a consequence when the male 
begins to twitch his abdomen in a vertical plane the tip strikes 
