268 JOUKNAL OF THE KOYAL HORTICULTURAL SOCIETY. 



For the maggot the best remedy is carboHc acid and hme. Slake 

 the hme to a thin cream. Use 3 pints to 1 gallon of water ; add 1 table- 

 spoont'ul crude carbolic. Apply weekly with great thoroughness, so 

 that surface of soil about plants is well coated. — C. H. L. 



Orangre Thrips. By D. Moulton {U.S.A. .Dep. Agr. Bur. of 

 Entom. Tech. Bull. 12, part 7; Feb. 1909; figs.).— This {Euthrips 

 citri) is a new and troublesome pest of orange trees in California. Its 

 attacks are characterized by curled and thickened leaves and marked 

 fruits. The pest is less prevalent on loamy than on clayey soils. It 

 is suggested that a strong tobacco wash should be used as a spray. 

 The insect is described. — F. J. G. 



Orchid, Fertilization of a Green. By G. W. Bulman, M.A., 

 B.Sc. (Knowledge, April 1910, pp. 129-130).— This article is based 

 upon observations by Prof. Plateau, of the University of Ghent, whom 

 the author supports in his view that the bright colours of flowers do not 

 play the important role in attracting insects which is usually assigned to 

 them. His observations extended to some seventy-nine species with 

 green or greenish flowers, which he found able to attract all the attention 

 from insects required for their pollination. The article is more particu- 

 larly concerned with observations upon the methods of pollinating the 

 Twayblade [Lister a ovata), an indigenous orchid bearing green flowers. 



Many observed details did not accord with those recorded by Darwin 

 and others, the insects settling indifferently upon any part of the flower 

 convenient, and commencing their consumption of nectar sometimes 

 from the bottom of the furrow in the lower lip and sometimes from the 

 top. Of 152 visitors not more than fifteen carried away pollen ; one 

 ichneumon fly visited twenty flowers without carrying away any. 

 Insects with pollen sometimes succeeded in freeing themselves from 

 their burden, and of those which safely collected and retained pollen 

 much was wasted on flowers already past the right stage ; but all this is 

 compensated for by the multiplicity of visits, so that most of the flowers 

 were successfully pollinated. One hundred and fifty-two visits observed 

 included eighty-four Diptera, twenty-one ichneumon flies, forty-three 

 other Hymenoptera, two Lepidoptera, and two beetles. Ichneumon 

 flies, although constituting only about 14 per cent, of the visitors, led to 

 about half the successful pollinations. — W. A. V. 



Orchid Portraits. — The following new and rare orchids have 

 been figured recently : — 



Angraecum Kotschyi . . Gard. Chron. 1909, ii. p. 221, fig. 



94. 



^Anguloa Cliftonii . . . Gard. Mag. 1910, p. 83; Journ. 



Hort. 1910, i. p. 117. 



Brassocattleya x Cliftonii mag- 



nifica Gard. Mag. 1910, p. 31; Orch. 



Rev. 1910, p. 48, fig. 4. 



