Glossary of Special Terms. 127 



Ventral membrane, the skin-like tissue connecting the tergites and the sternites 



(Diptera). 

 Ventral segments, the sternites of the abdomen. 

 Vertex, the crown of the head. 

 Verticillate, provided with whorls of fine hairs. 

 Vestigial, small, degenerate, not functional. 

 Vibrissa (-sse), a bristle or bristles on each side of the mouth-opening in front 



(Diptera) (PI. 13, fig. 304, v.). 

 Viviparous, bringing forth living young, not egg-laying. 



