GLOSSAKY. XVll 



guished by a distinct ring, ridge, or well defined space, or not. Tlio 



frontal orbit is that part of the orbit immediately abutting on the frons. 

 thoccra. — Schiner's and Erauer's name for the Bombylimorpiia, Procei-iiala, 



and PoLYTOMA. Scbiner, however, includes Leptid.e in the Oktiiocera. 

 Orthogeiiya. — Brauer's second division of his OuTiioRitnAi'iiA Braciiyceua, 



composed only of Empid.e and DoLiciiopin.E. 

 Ovate. — Egg-shaped, that is, an ellipse moi-e pointed at one end than the 



other. 

 Ovipositlon. — The act of depositing eggs by the female. 

 Ovipositor. — The female genital organs, as distinguished from those of the 



male. 



Falpi,2)<-(lijus. — These organs in the Diptera possess from one to five segments; 

 the vast majority of Brachycerous flies having only one segment, and 

 tlie Nematocera four. In many groups they are rudimentary, in 

 others absent (p. 19). 



Pectinate.— ^'hew tlie vestiture of the antennas is stronger tlum stiff pubescence 

 or vertieillate hairs and takes the form of stiff bristles, or branched 

 pendulous or variously formed solid jjrojections, they are termed 

 pectinate. 



Pectus. — The breast. Walker used it to denote the lower anterior part of the 

 thorax. Modern authors do not, I believe, employ the term. 



Perijmeiistic. — Larvte with spiracles on the median segments, as well as at the 

 head- and tail-ends, are so called. 



Peristoma, or peristome. — Apparently a synonym of epistoma. 



Piceous. — Blackish brown ; pitch colour. 



Pile.— A very closely set and very short pubescence of erect hairs resembling 

 the " pile " of velvet. 



Plati/ffciii/a.—Bmuevs first division of the Ortiiorruaimia Brachycera, com- 

 prising all the families except the E.mi'id.e, Dolichopid.e, and Loxciior- 



TEUID.E. 



Pleiirce.— The sides of the thorax are in many Diptera separated into fairly 

 distinct divisions by two sutures running longitudinally to the axis of 

 the body, and by one perpendicular or transverse suture. The upper 

 suture is the dorsopleural (or more correctly notopleural) ; the lower 

 longitudinal suture is the stervapleural. The vertical suture (though it 

 is seldom eitlier straight or absolutely vertical) is the mesopleural. The 

 pleurie (or spaces) are named the propleura (or prothorax), mesoj)leiira , 

 and pterovletira, the two latter divided from each other by the meso- 

 thoracic suture. Below the sternopleural suture are, tlie ster7iop)leMra (ia 

 front) and the hypupleura (above the middle and hind coxfc). The meta- 

 plenra \s & move, or less indistinct space behind the pteropleura and 

 hypopleiira, and adjacent to the metanotuni. 



Phmnbeous. — Leaden colour, which may be dull or shining. 



Poisers, or balancers. — The older authors' terms for the halteres. 



Pollinosr.—An expression used to define a surface with a light dust -like 

 covering, resembling pollen ; a finer vestiture even than tomentuin. 



Polytoma.—'Bvsmev's, (and Bezzi's) name for a superfamily consisting of the- 

 TiiEREViDiE and Scenopinid.e. 



