Santa Ysabel has six species of megachiropterans and 10 occur on Guadalcanal (Table 5). These two islands, separated by about 100 miles of water, share five species (_Rousettus amplexicaudatus_, _Pteralopex atrata_, _Pteropus rayneri_, _Dobsonia inermis_, and _Nyctimene albiventer_). The Nggela Group, in which Florida is the largest island and the only one from which bats have been collected, is 50 miles southeast of Santa Ysabel and 30 miles north of Guadalcanal (Fig. 16). Four species of megachiropterans are known from Florida (_Dobsonia inermis_, _Macroglossus lagochilus_, _Melonycteris aurantius_, and _Nyctimene major_). Three of these are known from Guadalcanal and one occurs on Santa Ysabel. This situation resembles the one involving Fauro, Bougainville, and Choiseul because none of the large bats (_Pteropus_ and _Pteralopex_) is known from Florida, even though two species of large bats that occur on Santa Ysabel to the northwest occur also on Guadalcanal to the south. Possibly Florida and the smaller islands that comprise the Nggela Group are ecologically unsuitable for large bats, or perhaps these small islands can support only limited numbers of individuals during part of a year. [Illustration: FIG. 16. The number of megachiropteran species known from individual islands (number within a circle) is compared with the number of species common to two different islands (number without a circle). For names of islands see Fig. 2.] Some of the small islands in the Solomons have populations of large fruit bats. For example, _Pteropus admiralitatum_ and _P. hypomelanus_ have been reported from the small islands in the Russell Group (Table 5). Possibly these species do not live concurrently in the Russells; specimens of the two were obtained in different years. Two small megachiropterans, _P. woodfordi_ and _Melonycteris woodfordi_, also inhabit the Russells. Shortland, a small island about 15 miles south of Bougainville, supports one large bat, _P. admiralitatum_, as well as smaller megachiropterans.