PROGRESSIVE MOTION OF INSECTS. 343 



grade movements, it is provided with a pair of 

 posterior appendages, which are supplied with 

 large nerves, and may be regarded as serving 

 the purpose of caudal antennae. 



The fore-legs, (one of which is represented in 

 Fig. 158*) are the burrowing implements, and 



they are admirably cal- 

 culated for their pecu- 

 liar office, both in the 

 shape and in the mode 

 of articulation of their 

 several divisions, which bear a considerable ana- 

 logy to the corresponding member of the mole. 

 Dr. Kidd observes, that, compared with the 

 other legs, and with the general size of the 

 animal, they are as if the brawny hand and 

 arm of a robust dwarf were set on the body of 

 a delicate infant ; and the indications of strength 

 which their structure manifests, fully answer to 

 their extraordinary size. For a more particular 

 description of the mechanism of this instrument 

 I must refer the reader to the paper above 

 quoted. 



