Zoological Xomenclature. 193 



c. In case of words of different etymology, but identical in form 

 and spelling, the later name is to be considered a homonym of the 

 earlier. 



Examples : Abeona Girard, 1854, and Aheona Stal, 1876. 



d. But words of different etymology, differing from each other 

 even in a single letter, are to be retained. 



Examples : Macrodon and Microdon ; Tmiia furcigem and Tcunia 

 furcifera. 



e. Similar generic names are not to be rejected when they are not 

 absolutely identical if correctly spelled. 



38. 



"When the name of the author of a species or other group is 

 abbreviated, the writer will do well to conform to the list of abbre- 

 viations proposed by the Zoological Museum of Berlin, adopted and 

 enlarged by the Paris Congress. 



39. 



In selecting a type authors should govern themselves by the 

 following : — 



1. A genus which contains a species bearing the same name, 

 either as a valid name or a synonym, takes that species as its type. 



2. To select as type some species which the original author studied, 

 unless it can be definitely shown that he had some other species 

 more particularly in mind. 



3. (If the genus has already been divided by former authors, 

 without the specification of types, the only available method of 

 fixing the original name to some part of the genus to which it was 

 originally applied is, of course, by the process of elimination ; but) 



If the genus contains both exotic and non-exotic species, from 

 the standpoint of the original author, the process of elimination is 

 to be restricted to the non-exotic species. 



4. To select as the type the species which is best described, or 

 best figured, or best known. 



40. 



It is very desirable that the original description of any group 

 should be accompanied by a diagnosis both individual and diffe- 

 rential, and written either in Latin, French, German, Engli>h, or 

 Italian. This diagnosis should also state in what museum the type 

 specimen has been deposited. 



41. 



In works not published in any of these five languages it is desir- 

 able that the explanation of the figures -and an abstract of the article 

 be translated into one of these tongues. 



