THE CONTROL OF INJURIOUS INSECTS 



413 



Sensoria. 



Spennatogenesis. 

 Spinneret. 



Spiracle. 



Stemite. 



Suctorial. 



Sulcus. 



Suture. 



Tergal. 

 Thorax. 



Trachea — ae. 

 Transition Zone. 



Truncate. 

 Venation. ' 

 Viscera. 

 Vittate. 

 Viviparous. 



The circular openings covered by membrane on the antennae 



or legs of plant-lice. 

 Development of the spermatozoa. 

 Any organ consisting of an internal tube, terminating in a 



pore, spine or process, producing a silky or waxy fibre. 

 A breathing pore opening to the trachea (Fig. 28). 

 The ventral piece in a ring or segment (Fig. 17). 

 Adapted for sucking. 



A furrow or groove; a groove-like excavation. 

 A seam or compressed line indicating the division of distinct 



parts of body-wall; the line of junction of elytra in Coleop- 



lera. 

 Belonging to the primitively upper surface. 

 The second or middle portion of the insect body, bearing the 



true legs and wings; made up of three sections, the pro-meso- 



and meta-thorax (p. 14). 

 The breathing tubes of insects (p. 23). 

 The transcontinental belt in which the austral and boreal 



elements overlap; it is divided into a humid or AUeghanian 



area, a western arid area, and a Pacific coast humid area. 

 Cut off squarely at tip. 



The system of chitinous framework supporting the win^s. 

 The internal organs of the body. 

 Striped. 

 Bearing living young. 



