92 tApril. 



Avauted on auy subject connected with North of England Natural History, 

 which had been published since auy interest whatever has been taken in 

 natural science in these counties. His help to science in this way has been 

 incalculable. He was personally known to almost every naturalist in York- 

 shire and Lincolnshire, and probably but few of them were unfamiliar with 

 his characteristic, clear, bold handwriting. 



As he was fortunately possessed with sufficient of this world's goods to 

 enable him to live comfortably without profession or business, he was able 

 to devote the whole of his time to congenial pursuits, and by far the most of 

 it was spent in the furtherance of Natural Science. His favourite hobby was 

 undoubtedly tlie Yorkshire Naturalists' Union, and from the time of his first 

 connection with it, when he was quite young, his work on its behalf was 

 untiring and indefatigable. It was on his suggestion that the Union, very 

 many years ago, adopted the system of the British Association of working the 

 different departments in " Sections," which has proved so successful ever since. 

 ¥oY nearly thirty years he was its honorary secretary, and, besides doing all 

 the ordinary detail work, edited its " Transactions" and saw through the press 

 many of the important works on. the Fauna and Flora of the County wiiich it 

 has published. For eighteen years (1884 to 1902) he edited the " Naturalist,"' 

 part of the time in co-operation with Dr. W. Eagle Clarke ; and also was 

 author, in conjunction with Dr. Clarke, of "The Vertebrate Fauna of York- 

 shire," published in 1881. Besides the Y. N. U., he was interested in many 

 other Scientific Associations. He had been a Fellow of the Linnean Society 

 since 1884, and had been President of the Yorkshire Naturalists' Union, and 

 also of the Lincolnshire Naturalists' Union. 



Born at Leeds, he resided there all his life, with the exception of a short 

 period of his youth, when he lived at Paunal, near Harrogate. His remains 

 were cremated at Lawnswood Cemetery, Leeds, on February 19th, the service 

 being attended by many members of the Yorkshire Naturalists' Union and 

 oiher Societies. — G. T. P. 



ON THE ALIMENTARY CANAL AND ITS APPENDAGES IN THE 

 LARVAE OF SCATOPSIDAE AND BIBIONIDAE (DIPTERA NEMA- 

 TOCERA), WITH SOME REMARKS ON THE PARASITES OF THESE 

 LARVAE. 



BY D. KEILIN, SC.D. 



(from the Quick Laboratory, University of Cambridge). 



The external morphology of the larva of Scatopse notata was first 

 described and figured by Perris in 1847, and tlie detailed structure of 

 the head, mouth-parts, and spiracles was recently given by de Meijere 

 (1916) and by Morris (1918). The internal organs of this larva, and 

 especially its digestive system, have not hitherto received attention. 



The structure of the alimentary canal of this larva is as follows : — 

 (Fig. 1.) The oesophagus (Oe.) is very short and ends in the proventri- 

 culus (P/\) or oesophageal valve ; the latter joins with the mid-gut 



