424, HISTORY OF ENTOMOLOGY. 
at present admitted. His Coleoptera, Psyche, and Di- 
ptera are evidently such. His idea of Hemiptera seems 
taken solely from the Cicada or Tettiv: but the man- 
ner in which he expresses himself concerning it, as 
having no mouth, but furnished instead with a lingui- 
form organ resembling the proboscis of Diptera*, proves 
that he regarded it as the type of adistinct group. Since 
he considers the saltatorious Orthoptera as forming such 
a group, it is probable that he included the cursorious 
ones with the Neuroptera in his majora section of Te- 
traptera ; and the resemblance of many of the Mantide 
to the Newroptera is so great, that this mistake would not 
be wonderful. His division of the Diptera is quite ar- 
tificial. 
How far Aristotle’s ideas with regard to genera and 
species attained to any degree of precision, is not easily 
ascertained: in other respects his knowledge of insects 
was more evident. As to their anatomy, he observes 
that their body is usually divided into ¢hree primary seg- 
ments,—head, trunk, and abdomen; that they have an 
intestinal canal,—in some straight and simple, in others 
contorted,—extending from the mouth to the anus; that 
the Orthoptera have a ventricle or gizzard». He had 
noticed the drums of Cicada, and that the males only 
are vocal. Other instances of the accurate observation 
of this great man might be adduced, but enough has 
been said to justify the above encomiums. His princi- 
pal error was that of equivocal generation. 
Little is known with regard to the progress of other 
Greek Naturalists in entomological science. It ap- 
4 Hist, Anim. 1. iv c. 7. 6 Tbhid. 
