USED IN ENTOMOLOGY. 83 



Metablastic: relating to the ecto- or metablast or ectoderm. 



Metabola: insects with a complete metamorphosis in which the larva does 



not resemble the adult, and the pupa is quiescent. 

 Metabolism: is transformation: the whole process or series of changes of 



food into tissue and cell-substance and of these latter into waste products ; 



the first of these changes being anabolic, the second katabolic. 

 Metabolous: undergoing metamorphosis or transformation. 

 Metacoxal plate: in Coccinellida, that portion of the first ventral segment 



included above the ventral lines visible on that segment. 

 Metagnatha: insects which feed with jaws when young and by suction, with 



tubular mouths when mature ; e. g., the Lepidoptera: see menognatha and 



menorhyncha. 



Metagonia: the hind or anal angle of a wing. 



Metallic: having the appearance of metal: applied to a surface or color. 

 Metaloma: the sutural or inner margin of primaries. 

 Metamere: a segment, somite or athromere. 

 Metameric: made up of segments or metameres. 

 Metamerism: the arrangement in metameres. 

 Metameros: in Lepidoptera, the 6th to 8th abdominal segments. 

 Metamorphosis: is that series of changes through which an insect passes in 



its growth from egg through larva and pupa to adult : it is complete when 



the pupa is inactive and does not feed ; incomplete when there is no pupa 



or when the pupa is active and feeds. 

 Metamorphosis dimidio: an incomplete transformation. 

 Metamorphosis perfecta: a complete transformation. 

 Metanotum: the primitively upper surface of the third or posterior thoracic 



ring: in Diptera, the oval arched portion behind, beneath the scutellum ; 



best developed in flies with long, slender abdomen : e. g., Tipulidcc. 

 Metaphragma: the hindmost internal thoracic septum. 

 Metapleura: in Diptera, a swollen space at the outside of the metanotum, 



between it, the pteropleura and the hypopleura ; in Hymcnoptera, the piece 



behind and below the insertion of the hind wings. 

 Metapleural bristles: in Diptera, are inserted in the metapleura. 

 Metapneustic: larvse, chiefly dipterous, in which the spiracles are confined 



to the posterior segment. 



Metapnystega: that circular area of metanotum behind the postscutellum. 

 Metapodeon: the abdomen behind the podeon or petiole in Hymcnoptera. 

 Metasternal: relating or attached to the metasternum. 

 Metasternal epimera: small sclerites separating the metasternal episterna 



from the ventral segments. 

 Metasternal episterna: sclerites situated on each side of the metasternum, 



immediately behind the mesosternal epimera. 

 Metasternellum: the sternellum of the metathorax. 

 Metasternum: the underside or breast of the metathorax. 



Metastethidium: = metathorax ; q. v. * 



Metastigma: in Odonata, the spiracles of third thoracic segment. /v / 



Metastoma: in Orthoptera; - - hypopharynx ; q. v. /c^ O^ O/\ 



O \ _f. 



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