FIELD BOOK OF INSECTS. 



the front legs is called the prothorax; the middle legs are 

 on the meso horax; and the hind legs, on the metathorax 

 The top is called the notum and the under side the stern! 

 We have, then, "pronoun," "prosternum, " and soT 



In manT" K th , 6 ^ the b d ^ back <* ^ thorax' 

 'fl /l Wdinary Cater P iIla "' * - 



' ^ props or claspers ' and i 



or another rt a ? C2Ua a PP end ^s of one sort 

 or another at the hmd end of the abdomen. Going from 

 the thorax outwards, the principal parts of the legs are 

 coxa trochanter, femur, tibia and tarsus. The tafsus s 

 usually made up of several joints and usually ends n one 

 or more claws. The first joint of the tarsus is sometime! 



ha 



obass Th b S Ca ~- 



. basitarsus. The big joints of the leg are the tibi 



ioint 7^, The tr Chanter " SmaU a " d - - 

 The coxa usually looks like a small part of the 



thorax. An insect's jaws chew, if they do chew sidewav 

 not up and down. The mouth parts are 



raodifieat and i 



n. e mouth parts are sb cto 



si the: f raodifieat r and in s me s^ ^ 



set of ? P ' erCe , a " d suck - ^^117, there are two 



ts of jaws: mandibles and maxilte. The latter are 



usually the more delicate and are furnished with a pair of 



alt ha '*- '" Ca " ed PalPS " THe l *> ^S 

 ha 



a has a- , " e *> 



has a pair of palps. These two sets of palps are 



supposed to be tasting organs. The eyes are of two" 

 compound and simple. The pair usually noticed are the 

 compound eyes and are compact clusters of singk eyes 

 (ommatidia). Some insects , such ag certa ^ fl ^ 



hsh, have not more than 12 ommatidia to each eye- and 

 some hawk-moths, 27 ,ooo. The simple eyes (oee H^are 

 situated between, and usually a little higher than tie 

 compound eyes. There are usually three! Finally' e 

 ou side of an insect's body is usually more or less cove ed 

 with hairs In butterflies and moths these hairs are 

 largely scale-like. When descriptions refer to hairy eyes 

 do not expect too much; a lens is usually necessary to see 

 these hairs. This is about all the anatomy one needs to 

 start with. .More will be explained as occasion arises 



8 



