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Show 1881.] REV. O. P. CAMBRIDGE ON A HYMENOPTEROUS"PARASITE. 259 the preceding and a Douroucouli {Nyctipithecus trivirgatus 1), all three probably from some district of the Upper Amazons. This is the first example of any species of the genus Callithrix which we have yet received alive. 3. A n example of a mammal of the genus Tupaia, obtained by purchase 11th January. The only form of this peculiar genus of Insectivora yet received was an example of Tupaia peguana, received in 1875 (see P. Z. S. 1875, p. 156.) Mr. Sclater exhibited examples of the eggs of:- 1. OPISTHOCOMUS CRISTATUS. Six specimens, belonging to Canon Tristram's collection, which had been obtained by a correspondent of Herr Nehrkorn of Riddags-hausen, Brunswick, at Obidos on the Amazons. These eggs" agreed in form and colour with the description of the egg of this singular bird given by Des Murs in his ' Oologie Ornithologique' (p. 108), and were certainly essentially Ralline in general characters. 2. COTURNIX DELEGORGII. A very beautifully marked egg, supposed to belong to this bird, had been sent for exhibition by Dr. Hartlaub. It had been obtained by Dr. Emin Bey, at Elema, in Equatorial Africa, where the species is said to be very common on the western shores of Lake Albert Nyanza (cf. Petermann, Mitth. 1881, p. 8). Mr. Howard Saunders exhibited, on behalf of Capt. E. A. Butler, Her Majesty's 83rd Regiment, some eggs of Dromas ardeola obtained on an island near Bushire, Persian Gulf. Mr. Saunders observed that this aberrant bird, which had generally been placed amongst the Plovers, laid pure white eggs placed in deep burrows in the sandy soil. {Cf ' Stray Feathers,' 1879, pp. 381-384.) The Rev. O. P. Cambridge, C.M.Z.S., exhibited and made remarks on a Hymenopterous parasite met with on certain Spiders in Dorsetshire, Linyphia obscura, Blackw. ($ ), and Linyphia zebrina, Menge ( <S ). The larvae were apodous and adhered to the abdomen of the Spider, and when full-grown were as large as the whole abdomen. The Spiders, although so burdened, seemed to lose none of their usual activity. The larvae had changed to the pupa state about three days after their capture, and, in ten days or so more, to the perfect insect. Dr. Capron, of Shere, near Guildford, has determined the parasite to be Acrodactyla degener, Haliday (Ann. N. H. ger. 1. vol. ii. p. 117 (1839). Very similar larvae have been observed on the abdomen of The- |