54 



ENTOMOLOGY 



FIG. 63. 



other secondary sexual peculiarities of the legs may be men- 

 tioned the tibial brushes of the male Catocala concwnbens, 

 regarded as scent organs, and the queer appendages of male 



Dolichopodidse that dangle in the 

 air as these flies perform their 

 dances. 



The pulvillus is commonly an 

 adhesive organ. In flies it has 

 glandular hairs that enable the in- 

 sects to walk on smooth surfaces 

 and to walk upside down; so also 

 in many beetles and notably in the 

 honey bee (Fig. 63) ; in this insect 

 the pulvillus is released rapidly 

 from the surface to which it has 

 been applied, by rolling up from the 

 edges inward. 



Sense organs occur on the legs. 

 Thus tactile hairs are almost always 

 present on these appendages, while 

 auditory organs occur on the front tibiae of Locustidse, Gryllidse 

 and some ants. Finally, the legs may be used to produce sound, 



FIG. 64. 



Foot of honey bee, Apis mel- 

 lifera. c, c, claws; p, pulvillus; 

 t 3 -t 5 , tarsal segments. After 

 CHESHIRE. 



Caterpillar of Phlegethontius sexta. Natural size. 



