576 PROC/n<JniN(}S of the ^LiTIONAL MUtiEVM. vol. xxxvi. 



Metamere. — Any one of the primitive segments of an embryo. 



Metathorax {Met). — The third thoracic segment. It is sometimes 

 confused with the first abdominal segment in Diptera, and has this 

 segment incorporated into it in the Hymenoptera. Segment alaire 

 posterieur Chabrier (1820). Metathorax Andouin (1824), Strans- 

 Diirckheim (1828). Second segment of aUtiuncus Kirby and Spence 

 (1820). 



M'urothorax {Mi). — The body of the neck segment. Its sclerites 

 form the cervical sclerites of the neck and probably the gidar plate 

 of the head. Its appendages are transferred to the head and fuse to 

 form the labium. Microthorax Yerhoeif (1902). Collo Berlese 

 (1906). Cerviemn Crampton (1909). 



Muscle disl' {MD). — Any disk-like or cup-shaped apodeme, usually 

 stalked, forming the attachment or insertion of a nniscle. 



Notal tving pi^oeesses {ANP, PNP). — The anterior and posterior 

 lateral processes of the notum to which are articulated the first and 

 fourth axillaries, or first and third when the fourth is absent. (See 

 Anterioi' notal wing process and Posterior notal wing process.) 



Notum {N). — This term is restricted in this paper to the anterior 

 or wing-bearing plate of the tergum in the meso- and metathorax, the 

 name postnotam or psevdonotum being given to the secondary pos- 

 terior plate of the back. Where the latter is absent, as it is in all the 

 other body segments and in all the segments of nymphs and of adult 

 Orthoptera, the notum is the entire tergum. 



Paraptera {P, 1 P, 3 P, 3 P, i P).— The small pleural plates at the 

 base of the wing, typically two before the pleural wing process and 

 tw^o behind it. The former are the preparaptcra or episternal parap- 

 tera (which see) ; the latter are the postparaptera or epinieral parap- 

 tera {which ^^q) . P arapth^e Xm\o\\h\ (1824). Pleural gelenkplatten 

 Voss (1905). 



Patagkun. — The patagia are two vertically elevated lobes of the 

 pronotum in many Lepidoptera. They vary from thick swellings to 

 fiat plates. They should not be confused with the teguhe of the meso- 

 thorax, which are also highly developed in the Lepidoptera. Patagi- 

 um Kirby and Spence (1826). 



Pecfvs. — A term used by the earlier entomologists to designate the 

 ventral and pleural surfaces together of any thoracic segment. Pectus 

 Fabricius (1778), Audouin (1824), Kirby and Spence (1826). 

 Co7ique pectorale Chabrier (1820). 



Peritreme {Pt). — The small plate sometimes surrounding a spira- 

 cle. Peritreme Audouin (1824). 



Phragma {Ph). — The vertical or oblique plale depending from the 

 anterior or posterior edge of any terguui. A phragma is reall}^ a» 

 chitinized inflexion of the intersegmental uiembrane ;uid, hence, is 

 always composed of two lamelhe, though these are closely appressed 



