. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 148 Bulletin Museum of Comparative Zoology, Vol. 140, No. 4 respectively. Metatarsi I-IV .68, .64, .65, .73 mm long, respectively. Male from Cambridge, Massachusetts, with structure essentially as in female, except as follows: carapace somewhat rounder (L/W = 1); eye area wider in proportion to length than in female (L/W =1); eyes smaller. Abdomen much smaller in proportion to carapace than in female. Calamistrum lacking from metatarsus IV. Palpal organ (Figs. 58, 59) of moderate size; radical apophysis absen
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 148 Bulletin Museum of Comparative Zoology, Vol. 140, No. 4 respectively. Metatarsi I-IV .68, .64, .65, .73 mm long, respectively. Male from Cambridge, Massachusetts, with structure essentially as in female, except as follows: carapace somewhat rounder (L/W = 1); eye area wider in proportion to length than in female (L/W =1); eyes smaller. Abdomen much smaller in proportion to carapace than in female. Calamistrum lacking from metatarsus IV. Palpal organ (Figs. 58, 59) of moderate size; radical apophysis absent; radix slightly produced at posterior lateral edge. Remainder of palpal structure close to O. concinnus. Coloration similar to fe- male, but paler in most cases. Total length, mm. Carapace .76 mm long, .82 mm wide. Tibiae I-IV .65, .71, .67, .73 mm long, respectively. Metatarsi I-IV .60, .65, .64, .72 mm long, respectively. Ecological Notes. The mode of life of this species is very similar to that of O. annutipes. Despite extensive remodelling of the rooms in which it was originally collected, O. interpellator is still (Septem- ber, 1968) remarkably common in the two rooms composing the insectary, and has spread to several adjacent rooms. All sizes except mature males were observed 20 September 1968, including six egg masses (PI. 1, Fig. 2) left in situ, all containing four eggs. The collection from which the types were taken contained nearly forty mature males and females (February, 1963). Webs (PI. 1, Fig. 1) cover virtually every corner and depression between cinder blocks, and are about a centimeter square, of the tubu- lar type described by Glatz (1967). Debris in the webs consisted of tiny cockroach nymphs and small ants, all of which had been sucked dry without obvious damage to the cuticle. When prodded from their webs, the spiders run with great agility over the walls, but seem unable to cling to smooth, clean surfaces. Distribution. Known only from the type loc
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