6o 



ENTOMOLOGY 



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

 changes of temperature. Hairs and spines frequently protect an insect 



\ 



B 



D 



FIG. 89. Modifications of the hairs of bees. A, B, Megachlle; C, E, F, Colldes; 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 



-_-Jt 



tiii 



I 



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



Satitrnia, to show developing hairs, c, cutic- base of a hair of a caterpillar, Picris rapce. 



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



