1881.] REV. O. p. CAMBRIDGE ON A HYMENOPTEROUS PARASITE. 259 



the preceding and a Douroucouli {Nyctipithecus trivirgatus ?), 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. An 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. 18/5, p. 156.) 



Mr. Sclater exhibited examples of the eggs of : — 



1. OpISTHOCOMUS CRIST atus. 



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 Elemd, in Equatorial Africa, where the species 

 is said to be very common on the western shores of Lake Albert 

 Nyauza {cf. Petermaun, 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 re- 

 marks on a Hymenopterous parasite met with on certain Spiders in 

 Dorsetshire, Linyphia obscura, Blackw. (5 ), and Linyphia zebrina, 

 Menge ( d )• The larvae were apodous and adhered to the abdomen 

 of the Spider, and when full-grown were as large as the whole ab- 

 domen. 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. ser. 1. vol. ii. p. 1 17 

 (1839). 



Very similar larvae have been observed on the abdomen of The- 



