GLOSSARY OF TP:RMS USED IN DIPTP^ROLOGY 



487 



Macrotrichia — The larger microscopic hairs on the surface of the wings. 

 Marginal cell — The cell Iving between the first and second longitudinal veins 



(R,). 

 Marginal scutellars — Bristles situated close to or on the margin of the scutel- 



lum. 

 Media — The fourth longitudinal vein. 

 Medial — Pertaining to the media or middle. 

 Median — Along the middle. 

 Mesad — Toward the middle. 



MESONOTAL BRISTLES 



a, acrosticals; as, apical scutellars; dc, dorsocentrals; hm, humeral; ia, 

 intra-alar; Is, lateral or basal scutellars; ms, marginal scutellars; npl, noto- 

 pleural; pa, postalars; pr, presutural; sa, supra-alars; sc, scutellars; si, sub- 

 laterals. 



Mesonotum — The dorsum of the mesothorax or the main part of the back. 



Sometimes termed the mesoscutum. According to morphological usage 



the divisions of the mesonotum are, from front to rear, prescutum, scutum, 



scutellum and postscutellum.* 

 Mesopleura — A so-called pleurite or sclerite of the pleura bounded above by 



the mesonotum, in front by the propleura, below by a move or less distinct 



suture and behind by a suture extending down from in front of the wings. 



The so-called suture separating the mesopleura and sternopleura is merely 



a fold leaving an exterior furrow. 

 Mesoscutum — See mesonotum. 



Mesosternum — The under side of the mesothorax. 

 Mesothorax — The second and largest segment of the thorax. The wings and 



second pair of legs arise from this segment. 

 Metacephalon — The area behind the mouth extending up toward the neck. 

 Metanotal slopes — Swellings on the sides of the metanotum or its sloping 



sides (pleurotergite). 



* While not jirofessinp any jrreat knowledge of morphology I am far from being con- 

 vinced that the Metanotum, as used by taxonomists is actually part of the Mesonotum: there 

 is a distinct, membranous suture between this part and the scutellum, such as one expects to 

 find between true sclerites. 



