Rules of Zoological Nomenclature. 181 



Ahrceus cohceresy sp. n. 



A. bonzico eimilis, sed multo minor, fronte leviter impressa ; meta- 



sterno baud canaliculato. 

 L. If miU. 



Circular in outline, convex, black and somewhat opaque, 

 densely punctate, with short slightly club-shaped setae ; the 

 head densely and coarsely punctured, with a feeble median 

 frontal impression ; the thorax and elytra are similarly punc- 

 tate, except that the thorax has large punctures along the 

 basal edge, and the elytra for the posterior half are longi- 

 tudinally rugose ; the propygidium is punctured like the disk 

 of the thorax, but the punctuation of the pygidium is smaller, 

 more even and clear ; the prosternum and mesosternura are 

 somewhat irregularly punctured, the punctures varying in 

 size ; the metasternura has an extremely fine longitudinal 

 median line, and the punctures on the surface are more closely 

 set than those of the mesosternum ; along the anterior edge 

 of the first abdominal segment is a row of large punctures. 



This species resembles A. bonzicus, Mars., but it is about 

 half its size. A. honzicus has a straight, shallow, but well- 

 marked median channel down the middle of the metasternum; 

 this character is not noticed by Marseul. It is probable 

 both species are of stercoraceous habits, as I found A. bonzicus 

 in great profusion in horse-dung at Otaru, on the west coast 

 of Yezo, on the 4th August, 1880. 



Hab. Hongkong {J. J. Walker). Several examples. 



XXIV. — Report on the Eules of Zoological Nomenclature to besuhmittecl 

 to the Fourth International Zoological Congress at Cambridge by 

 the International Committee for Zoological Nomenclature*. 



1898. 



Iktkodxjction. 



This Keport is " informal," in the sense that while the Committee 

 has discussed the subject-matter herein contained, and has agreed 

 to submit to the next International Zoological Congress the views 

 expressed below, it has not yet had an opportunity to discuss in 

 detail the exact arrangement of the various rules and recommenda- 

 tions. In its final sessions at Cambridge the Committee will 



* The International Committee, which was appointed at the Leyden 

 Meeting of the Congress in September 1895, consists of Dr. R. Blanchard 

 of Paris, Prof. J. Victor Cams of Leipzig, Dr. F. A. Jentink of Levden, 

 Mr. P. L. Sclater of London, and Dr. C. W. Stiles of Washington. ' The 

 English edition of the Keport has been prepared by Dr. Stiles, 



