412 



EXTERNAL ANATOMY OF INSECTS. 



The twelfth segment, paratelum, becomes the terminal 

 one in the females of all pedunculated, and some few other 

 ordei's of insects. 



The thirteenth segment, telum, is remarkable for its various 

 apophysal and epiphysal appendages, for its containing the 

 organs of generation and reproduction, and for its total absence, 

 or perhaps conversion into some essential organs, in the females 

 of pedunculated insects. 



The principal variations will perhaps be more readily under- 

 stood by a glance at the following table : 



And here it is necessary that I conclude this letter, which 

 has already extended to an unreasonable length ; although, in 

 the desire of intruding as little as possible on the pages of a 

 magazine occupied by writers in every respect so much more 

 worthy of them than myself, I have studiously suppressed 



^ By " Maximum of Caput " I mean more particularly to imply the full, perfect, 

 and osseous development of the seven organs of manducation. By " Minimum 

 of Caput " the entire absence of masticatory organs. 



