570 PROCEEDiyrJS of the yAriONAL museum. vol. xxxvi. 



VIII. GLOSSARY AND SYNONYMY. 



The followinij principles have been used in the selection, applica- 

 tion, and si^elling- of the anatomical terms here explained: 



1. The same names are repeated in each segment on corresponding 

 parts and distinguished in each by the prefixes pro, meso, or meta. 



2. The terms proposed by Andonin (1824) are retained in all cases 

 except where there are very strong reasons for discarding any one 

 of them, as in the substitution of cntostern^im Chabrier (1820) for 

 entothorax Audouin, and of 'pscridonotiiin Yerhoeff (1903) for post- 

 scutellum Audouin as the general name of Ihe posterior tergal plate. 

 (See rule 8.) 



3. Parts not named by Audouin have been given names selected 

 from the works of other anatomists when such names are descriptive 

 of the parts to Avhich they are applied or are in accord with the gen- 

 eral system of naming the other parts. Priority is not recognized 

 because it would involve the retention of too many inappropriate or 

 cumbrous terms. 



Jr. In naming the Aving A'eins and their l)ranches, the names and 

 venational system of Comstock have been used in all cases. 



5. No attempt has been made to give, in the synonymy, the equiva- 

 lence of terms used b}^ systematists in different orders. Their systems 

 of nomenclature too often show an absolute disregard for, or igno- 

 rance of, comparative anatomy. 



G. The term dorsum is used to designate the entire back of the 

 insect or of any part or segment, and the term venter is applied in 

 like manner to the ventral surface, 



7. The names tergtim, pleiirinn, and sternum are used to designate 

 all the chitinous parts of the morphological dorsal, lateral, and ven- 

 tral surfaces, respectively, in any segment; the individual plates in 

 each are called tergites, pJeuritcs, or stern '/tes. An exception to this 

 is the use of the word sternum, applying also specifically to the second 

 sternite of any segment. 



8. The term iiotum is applied to the jjrimitive wing-bearing plate 

 of the dorsum, and is synonymous with tergum, except where, as in 

 the meso- and metathorax of most adult insects, the dorsum acquires 

 a secondary tergal plate back of the wing-bearing notum. This sec- 

 ondary plate is called the postnotum or pseudonotum. 



9. The prefixes pro, meso, and meta are* used only to signify that 

 the part so designated belongs to the prothorax, mesothorax, or meta- 

 thorax. 



10. The prefixes pre and post are used to indicate the anterior and 

 posterior parts, respectively, of any one segment. 



11. The prefix prm is discarded in favor of pre. 



