16 THE ENTOMOLOGICAL CODE. 



72. In case of minute insects or acari where more than one speci- 

 men is mounted on a slide one should label but one slide as the type 

 slide, and if there is doubt or a mixture of species it shall be treated 

 as a case where the author has labeled more than one specimen as 

 type. 



73. The following rules apply for the fixation of types of species 

 in the order given: 



A. Author's Fixation in the Original Description. 



a. If a specific name is based on but one specimen, that specimen 

 is the type. 



b. If an author labels or, in the original description, designates a 

 certain specimen as type, that specimen is the type. 



c. If an author in the original description designates a series or 

 collection of specimens as type, then the type is among such desig- 

 nated material. 



Note. — Obvious errors or transposals of labels are sufficient 

 grounds for disregarding rules b and c. 



B. Fixation by Others than the Author, or by the Author 

 Subsequent to the Original Description. 



d. A specimen to be chosen as type must be found among ma- 

 terial presumably examined by the author at the time of its descrip- 

 tion. 



e. The type shall not be selected from among material indicated 

 in the original description as variational or aberrational, nor from 

 material doubtfully included in the species. 



/. If it is anywhere stated in a work that a new species described 

 therein is based on material wholly from a source other than the 

 author's own collection, the type is to be selected from among such 

 material. 



g. If there are distributed to two or more collections specimens of 

 a species all labeled by the author as types, or none labeled as types, 

 the type should be selected from the specimens retained, if any, in 

 the collection of the author. In case of a joint work the first author 

 has precedence. 



h. If two or more species are included in the original series of 

 specimens upon which a new species has been based and the author 



