MO LOGY. 



in different i; by the accompany 



What arc supposed to In Hyni t aiul 



.";. described by Will.J These consist 



:he labium and on the lower side of the maxilla: thro; 





49. Organ of taste in the labium FIG. 50. Similar or^an in maxilla of the 



\:ter Will.) same insect. (After Will.) 



'ing of Fifs. 49 and 50. C, cuticle; /', pit in the same; Sc, sense-cell; N<\ neurilemma of sense- 

 cell; A .der of sense-cell; E, end of the same; N t nerve connected with sense ^ 

 -land -eel Is. 



whi .I" nerves come to the surface. The structure of th 



is shown in Figs. 49 and 50. 



It is probable that organs of 

 touch are well developed in main- 

 insects. Leydig, Hicks, and Vial- 

 lanes have described tactile hairs, 

 which are situated upon pores in 

 the cuticle, in which nerves end. 

 Figure 51 is a diagram of one of 

 these hairs. 



The Respiratory System. If an 

 FIG. 5 i -DiaRTam of tactile hair, c cuticle: insect be carefullv examined there 



bm, basal membrane: //, 3 



; kc t hair-eel!; n. nerve; f, nerve-cell. can ] )c found along the sides of the 



: -.-ily seen in mam 



id other larva?; the}' are the openings of the respiralnrv 



termed the sf trades. 

 The number of spiracles varies greatly in different in> 



er, never more than one pair on a single segment 

 the body. They do not occur on the head, but are borne by i-ach 

 lents, and by the fir-t eight abdominal segments, 

 that may bear spi: mt they 



'ways lackin >r more of tli 



regarding these orga n, translate.] 1 



r<ilist, 1887, p. 182. 



rift fUr \Visscn. 

 1885, p. f 



