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Show 164 MR. S. B. WILSON ON THE GENUS CHASIEMPIS. [Feb. 17, of which Parker1 remarks: "There is an oval fontanelle (such as is common in Lizards) in the prsesternum and a large part of the mesosternum, and the hinder part of the prsesternum is occupied by the primordial fissure." This inquiry has been carried out in the Biological Laboratory of the Royal College of Science, South Kensington, at the suggestion of m y teacher, Prof. G. B. Howes; and to him my sincere thanks are due for his help and supervision. The features noted apply equally to both the Rabbit (Lepus cuni-culus) and Flare (Lepus timidus): no differences of fundamental importance being recognizable between them. 3. O n the Muscicapine Genus Chasiempis, with a Description of a new Species. By S C O T T B. W I L S O N , F.Z.S. [Received January 31, 1891.] I propose in the present paper to state briefly the distinctions between the various species of this interesting genus of Flycatchers which are to be found inhabiting the various islands of the Hawaiian group, and this object will, I think, be greatly furthered by a key. In drawing this up, I have to some extent followed that given by m y friend Dr. Stejneger (Proc. U. S. Nat. Mus. 1887, p. 87), and I should also mention here that, quite recently, I sent him a series of the different species in m y collection, with the idea of ascertaining his opinion on some difficult points. Dr. Stejneger kindly answered m e very fully, and I am glad to say that our views are nearly, if not quite, in accord on the subject. Graf Hans von Berlepsch was kind enough to send me a short time since a paper of his on Chasiempis, containing a good coloured figure of one species. I do not agree with the conclusions at which he arrives, and think that they are partly due to the insufficient material he had to work upon ; for, though the collection upon which he based his observations is rich enough as regards the number of specimens, but one island-Oahu-seems to be represented in it. I shall comment at length ou this paper in the Part of my ' Birds of the Sandwich Islands' which deals with Chasiempis, merely stating here that Graf von Berlepsch unites Chasiempis ridg-wayi, Ch. ibidis, Ch. sclateri, and Ch. gayi under the head of Chasiempis sandwichensis, and is of opinion that his series of skins bears this out. As will be seen further on, m y views are very different from his, but are more probably correct, as I have had specimens from the different islands for comparison, while he had to rely in a great measure on figures and descriptions. Another article which must be referred to is that by Dr. Sclater, " O n the Muscicapine Genus Chasiempis" (Ibis, 1885, p. 17), a 1 W . X. Parker, Ray Society's Monograph on the Shoulder-girdle and Sternum in Vertebrates, p. 217. Cf. also Flower, ' Osteology of Mammalia,' pp. 99, 100, figs. 37, 39. |