NOTES AND EXHIBITS. 521 



Mr. W. W. Froggatt showed a series of specimens recently 

 collected by him in the New Hebrides, comprising — a web- 

 spinner, Oligotoma sp. [Fam. Embiidce] ; a handsome fruit-fly, 

 Dacus frenchi Froggatt, a common orange-pest ; and another 

 fruit-fly( Dacus sp.) close to, if not identical with, the common 

 melon-fly of India and Ceylon(Z). cucurbitce Coqu.;, and destruc- 

 tive to melons in the Northern Territory of Australia. Also 

 specimens of four species of Coconut leaf -mining beetles [Fam. 

 Hispidce], Promecotheca opacicollis from the New Hebrides, P. 

 antiqua from the Solomon Islands, P. reichei from Fiji, and an 

 undetermined species from Samoa; these beetles do an enormous 

 amount of damage in the coconut plantations. 



Mr. North, by the sanction of the Curator of the Australian 

 Museum, sent for exhibition, the types of Vini stepheni, Ptilopus 

 insularis, and Porzana atra, collected by Mr. A. E. Stephen, in 

 1907, at Henderson or Elizabeth Island, an outlier of the 

 Paumoto Group or Low Archipelago, in the South Pacific, 

 described by Mr. North in the Records of the Australian 

 Museum, in the following year. Attention has recently been 

 drawn to these species by Mr. W. R. Ogilvie Grant, in a paper 

 in the July number of " The Ibis," in which he beautifully 

 figures Stephen's Lorikeet, Vini stepheni (North). 



DISCUSSION. 



The discussion on "The Study of Zoogeographical Distribution 

 by means of Specific Contours," introduced by Mr. R. J. Tillyard 

 at the Meeting in May, was continued by Dr. J. B. Cleland, 

 Mr. Tillyard reviewed, and replied to, the criticism of his 

 proposals. The following is a summary of the discussion : (for 

 Mr. Tillyard's introductory remarks-, see pp. 172-1 73). 



Dr. Ferguson exhibited a typical Entogenic Contour, which he 

 had obtained by Mr. Tillyard's method, for a well-defined group of 

 Australian Amycteridce [Coleoptera]. 



Dr. Cleland claimed that the chief, in fact, almost the only, fac- 

 tor in the determination of zoo-geographical distributions of 

 groups was the tendency of species to mutate; and expressed the 



