GLOSSARY. 231 



Segments. — Eings of which an insect is composed — considered to be 

 thirteen, including the head. 



Spiracles. — Breathing-pores for the most part placed along the sides 

 of insects, or at the end of the tail, by means of which the air is 

 drawn into or expelled from the trachece, or breathing-tubes. 

 Stigma. — A small thickened spot on the front edge of the fore wing of 



various kinds of insects. 

 Sucker-feet. — Prolegs ; fleshy appendages, whereby hirvce hold firmly 



to the twigs, &c., whereon they are placed. 

 Tarsi. — Feet, the fourth chief division of the leg ; being that on which 



the insect rests. 

 Telum. — Last segment of the abdomen. 

 Thorax. — The three segments next to the head, known respectively 



as the p?'o-, meso-, and meta-thorax, of which in i^erfect insects 



the first bears a pair of legs, the other two each a pair of legs and 



wings. 

 Tibia. — Shank ; third chief piece of the leg; between the thigh (femur) 



and foot (tarsus). 

 'Trachea;. — Organs of respiration communicating with the air by 



breathing-pores (spiracles), and conveying it by means of smaller 



tubes throughout the body. 

 Troclmnter. — A very small portion of the leg placed between the hip 



and the thigh. 

 Ungues. — Claws, or curved hooks, at the extremity of the foot. 

 Viviparous. — Producing living young. 



