SLIME SLUGS, MYRIAPODS AND INSECTS 133 



tinguish colors and pattern when the color shades and the 

 outlines are strongly contrasted, yet on the whole insect eyes 

 are much better constructed for quickly recognizing moving 

 bodies and passing shadows than for seeing in detail either 

 the shape or the color pattern of objects. 



Legs. The appendages of the bee's thorax are the legs and 

 the wings. The thorax is composed of three closely fused body 



FIG. 55. Legs of honey-bee. A, Left front leg of worker, anterior 

 view, showing position of notch, dd., of antenna cleaner on base of first 

 tarsal joint, tar., and of closing spine ee, on end of tibia tb; B, spine of 

 antenna cleaner, ee, in flat view; C, details of antenna cleaner; D, left 

 middle leg of worker, anterior view; E, left hind leg of worker, anterior or 

 outer view, showing the pollen basket, cb, on outer surface of tibia, 

 tb and the so-called "wax-shears," ff, F, inner view of first tarsal 

 joint of hind leg of worker, showing rows of pollen-gathering hairs 

 on tarsus, tar. (After Snodgrass.) 



segments. Each, of these segments bears a pair of legs, but 

 only the hinder two bear pairs of wings. The legs of the bee 

 are of the number characteristic of insects. However, some 

 insects have the legs wanting. In such insects as have adopted 

 a strictly sedentary life, as the scale insects, absence of the 



