2 
Psyche 
[March 
near Puerto Viejo, Heredia Province, Costa Rica, had substantial 
populations of M. sp 3: M. sp. 4 was found on low vegetation in 
January and February, 1978, in mid-elevation wet forest in Guatopo 
National Park, Miranda State, Venezuela. Individuals of the last 
four species were observed in the field on only one or two days each, 
but in all cases more extensive observations had already been made 
on the other species, and it was thus possible to make critical ob- 
servations allowing comparisons among all six species. Miagram- 
mopes sp. 1-4 appear to be either undescribed species or females of 
species known only from males. Voucher specimens of these and 
of the two previously described species are deposited in the Museum 
of Comparative Zoology, Harvard University. 
The Webs 
M. simus 
The web typically consisted of a single vertical capture thread 
about 1 m long, attached above to a short, horizontal resting thread 
strung under a leaf, and below to the ground or a leaf or twig (Fig. 
la). The capture thread was covered with sticky, cribellar silk along 
the central 50 to 60 percent of its length, and one or more very fine, 
more or less horizontal threads often connected it to other supports. 
Both end portions of the capture thread were non-sticky. For an 
individual whose webs were measured periodically, the lengths of 
sticky and non-sticky sections in new webs were (in cm; lengths of 
sticky portions underlined): 20:50:30, 4:50:30, 6:52:34, 7:60:32, 
and 7:60:34. One adult female which had been starved for seven 
days made a web with two vertical capture threads and several thin, 
non sticky lines between them. 
One M. simus was seen laying sticky, cribellar silk on a non- 
sticky, vertical thread which was already in place. The spider moved 
slowly up the thread, combing out silk with legs IV until it was 
about 5 cm below the resting thread, then ran up and assumed the 
resting posture. 
Individuals of M. simus rested under the horizontal thread and 
held onto the broken end of the capture thread with one leg I and 
one leg II, while the other legs held the resting thread (Fig. lb). Ten- 
sion was exerted on the vertical capture thread both by pulling it up 
with leg I and by backing up and pulling in the resting thread with 
the fourth pair of legs. The spider which constructed a web with two 
