164 MR. S. B. TVILSON ON THE GENUS CHASIEMPIS. [Feb. 1/, 



of which Parker^ 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 praesternum 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 my 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 Hare (Lepus timidus) : no differences of fundamental 

 importance being recognizable between them. 



3. On the Muscicajjine Genus Chasiempis, witli a Description 

 of a new Species. By Scott B. Wilson, F.Z.S. 



[Eeceived 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 

 gr\-en by my friend Dr. Stejneger (Proc. U. S. Nat. Mus. 1887, 

 p. 87), and 1 should also mention here that, quite recently, I sent 

 him a series of the different species in my collection, with the idea 

 of ascertaining his opinion on some difficult points. Dr. Stejneger 

 kindly answered me very fully, and I am glad to say that our views 

 are nearly, if not quite, in accord on tbe 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 repre- 

 sented in it. I shall comment at length on 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, my 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 .ind descriptions. 



Another article which must be referred to is that by Dr. Sclater, 

 "On the JVluscicapine Genus Chasiempis" (Ibis, 1885, p. 17), a 



^ W. K. Parker, Ray Society's Monograph on the Shoulder-girdle and 

 Sternum in Vertebrates, p. 217. Cf. also Flower, ' OBteology of Mammalia,' 

 pp. 99, 100, figs. 37, 39. 



