1978] Lubin, Eberhard, & Montgomery — Miagrammopes 13 
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Figure 8. Two possible mechanisms which could result in prey becoming en- 
tangled as a result of sagging behavior. A) The prey drops faster than the line 
below it, and thus becomes entangled. B) The prey’s momentum, acquired when 
the spider jerks the line up after a sag, causes it to become entangled in the line just 
above it. This hypothesis depends on the thread below the prey being extensible. 
on four occasions. Each time the spider jerked and sagged the cap- 
ture thread several times, ran a short distance down the capture 
thread, wadding it up as it went, and then cut the line above the ant 
and ran back up to the resting thread. These ants were thus recog- 
nized from a distance, perhaps by their strong alarm odor. After 
an ant was rejected, the wadded-up section of the capture thread 
was manipulated in the mouthparts for several minutes (feeding?), 
then dropped. Rejection of prey thus resulted in destruction of the 
capture thread. A new thread was often built within a few hours. 
Three other ants, two Camponotus sp. and one Ectatoma sp., 
all about the same size as the spider (6-7 mm long), were attacked 
successfully, but modifications of the capture sequence occurred in 
all three trials. In two, the spider dropped the lower portion of the 
