GLOSSARY OF TP:RMS USED IN DIPTEROLOGY 491 



Rostrum — The beak or snout. 



Rugose — Wrinkled. 



Rugulose — Finely wrinkled. 



Scape (of antennas) — The basal two segments in those flies having six or more 

 antennal segments. These segments are differentiated from the remain- 

 ing segments, although the first may be small and ring-like; the second 

 segment is sometimes called the pedicel. 



Sclerite— Any piece of the body well surrounded by sutures. 



Scutellum — A (usually) convex sclerite attachetl to the back of the mesonotum. 

 Sometimes termed the shield. 



Scutum — The part of the mesonotum behind the transverse suture. 



Second basal cell — A cell lying immediately behind the first basal, rarely 

 united with it, more often open apically and united with the discal cell, 

 but closed in most cases (Cell M). 



Second vein — The vein (frequently absent), lying immediately behind the first 

 vein, its base always united with the base of the third vein (Rs and its 

 anterior branch R.+s). 



Serrate — Toothed along the edge like a saw. 



Sessile — Broadly attached; incapable of movement. 



Seta — A bristle. 



Setaceous — Bristle-like. 



Setigerous tubercles — Tubercles, occurring on the scutellum or legs, each 

 bearing a spine or bristle on its top. 



Setulse — Very short hairs, sometimes coarse. 



Setules — Setulae. 



Setulose — Bearing setulae. 



Sinuous — S-shaped, winding back and forth. 



Sixth longitudinal vein — The first anal vein. The second anal is usually absent 

 or represented by a fold extending around the anterior apex of the alula. 

 (Anal vein). 



Small crossvein — The anterior crossvein (r-m) . 



Spatulate — Broadened apically, narrow basally. 



Spiracles — The external openings of the tracheal system. 



Spurs — Either movable spines at the end of the tibiae or strong production of 

 apex of tibiae or a tapering production of some part of the body, usually 

 on the legs. 



Spurious vein — An extra, usually very weak vein crossing the anterior cross- 

 vein. 



Squamae — The scales or connecting lobes connecting the wings basally with 

 the thorax. There are two lobes, the upper and lower. The lower lobe 

 is often greatly enlarged and is generally referred to as the squama. 



Squamose — Scale-like. Refers particularly to scale-like hairs. 



Sternites — Ventral sclerites or the under side of the segments. 



Sternopleural bristles — Bristles situated on the upper part of the sternopleura 

 on the posterior half. 



Sternum — The under side of the thorax, comprising the pro-, meso- and meta- 

 sternum. 



Stigma — A darkened and often thickened area lying immediately behind the 

 costa, either beyond the tip of the first or second veins. 



Stylate — Bearing a style. 



Style — A thick, terminal portion of the antennae arising from the third seg- 

 ment, sometimes simulating segments, but usually tapering. 



Stylose — Bearing a style. 



Subantennal groove — See facial grooves. 



Subcosta — The vein, usually present, between the costa and the first longitudi- 

 nal vein. 



