. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 72 Bulletin Museum of Comparative Zoology, Vol. 154, No. 2. Map 1. The number of species of Metazygia in various areas. tion. I don't know much about the retreats of the other nocturnal species (and since retreats may be disassociated from webs, I was unhkely to be aware of the spider's retreat when I found the spider on a web at night). Dynamics of webs: I can only give you details for gregalis and octama. The oc- tama web seems relatively fragile, and the spiders had often torn down the web and were feeding on a bal
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 72 Bulletin Museum of Comparative Zoology, Vol. 154, No. 2. Map 1. The number of species of Metazygia in various areas. tion. I don't know much about the retreats of the other nocturnal species (and since retreats may be disassociated from webs, I was unhkely to be aware of the spider's retreat when I found the spider on a web at night). Dynamics of webs: I can only give you details for gregalis and octama. The oc- tama web seems relatively fragile, and the spiders had often torn down the web and were feeding on a ball of prey not more than a couple of hours after dusk. I never saw one of these (they lived in our yard in Cali) put up another web, but might have missed it (espcially if a second web was put up just before dawn and then soon torn down). I had some students do all night projects with gregalis, and they found that the same individual built two to three webs per night. Generally the first web was just at dusk, and the others substantially later at night. M. gregalis is a generalist when it comes to feeding. I have the impression that in- traspecific variation in the form in the Me- tazygia orb is relatively high in M. gregalis. Sizes of prey items are reported in Cas- tillo and Eberhard (1983). Distribution. Metazygia is known only from the Americas. There are several pairs of very similar allopatric species, one north, the other south, without overlap: wittfel- dae and dubia, and zilloides and keyser- lingi. Metazygia species of the southeastern United States, not otherwise cited in this paper, are as follows: M. carolinalis (Arch- er) (the male is unknown); and M. calix (Walckenaer), NEW COMBINATION. Metazygia calix (Levi, 1976, figs. 137-144) was placed in Alpaida but has genitalia similar to those of M. laticeps (Figs. 226, 227, 230) and M. sendero (Figs. 216, 217, 221). Misplaced Species. Metazygia livida Mello-Leitao, 1941: 151, 12. Female from Argentina is a Dictyna (Dicty
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