6o 



ENTOMOLOGY 



nating caterpillars (as Isia Isabella) probably protects them from sudden 

 changes of temperature. Hairs and spines frequently protect an insect 



FIG. 89. Modifications of the hairs of bees. A, B, Megachile; C, E, F, Colletes; D, Chelos- 



toma. After SAUNDERS. 



from its enemies, especially when these structures are glandular and emit 

 a malodorous, nauseous or irritant fluid. Glandular hairs on the pulvilli 



FIG. 90. Section of antenna of a moth, FIG. 91. Radial section through the 



Saturnia, to show developing hairs, c, cutic- base of a hair of a caterpillar, Pieris rapa. 



ula; //formative cell of hair; h, hypodermis; c, cuticula; /, formative cell; h, hair; hy, 



t, trachea. After SEMPER. hypodermis. 



of many flies, beetles, etc., enable these insects to walk on slippery sur- 

 faces. The twisted or branched hairs of bees serve to gather and hold 



