436 Proceedings of the Royal Physical Society. 



numbers of brown wasps; their nests, which consist of 

 paper webs without any external protection, hung from the 

 branches of every tree. A large yellow and black species 

 burrowed in the sand dunes. There were two small black 

 bees, and others of various colours. Ants swarmed every- 

 where, Myrmeca domestica being particularly abundant. 

 Dipterse were represented by legions of the common house 

 fly, lots of bluebottles, some mosquitos, two small Muscce with 

 shining bodies, one green and the other blue, and some others, 

 but not of large size. We only secured one butterfly, not 

 unlike our own common blue, but smaller and less brightly 

 coloured. About a dozen species of moths were collected ; 

 the most abundant, during daylight, were a dull brown 

 variety, and another, smaller, with satin-like white wings 

 having a broad dark brown border ; one nocturnal species was 

 caught, and some of a small emerald-coloured variety. This 

 catalogue is simply miserable compared with that of Pernam- 

 buco, and we were much disappointed with this part of our 

 collection. 



■ In fresh water we got two Crustacea ; one, a small Gam- 

 marus-YikQ amphipod, occurred in the streams ; the other, an 

 ostracode, about the size of a split pea, was abundant every- 

 where. In a lake, which lies in the south-west part of the 

 island, are millions of ostracodes, but no other animal life 

 with the exception of some insect larvae. This sheet of 

 water is situated in a depression on a kind of terrace quarter 

 of a mile broad. A line of cliffs rises above it on the land- 

 ward side, and towards the sea; another cliff descends to the 

 beach. It is small and difficult to find, being surrounded 

 with dense scrub reaching to the water's edge ; and grass 

 grows in the water for some yards from the shore. The 

 bottom is completely covered by algse. 



We saw several spiders, a scorpion, a centipede, one or 

 two species of earthworm, and a couple of small terrestrial 

 snails. 



In regard to marine life, one is struck with the enormous 

 number of fish. Blennies and gobies swarm in the tidal 

 pools, and go skipping over the rocks in shoals as one walks 

 among them. The perch and wrasse type is represented by 



