390 SYSTEM OF INSECTS. 
Def. Metamorphosis obtected 3 . 
Mouth antliate". 
Prothorax very short, covered by a pair of tip- 
pets. 
Wings four, covered partially or generally with 
minute scales : ncuration branching, often 
with a central areolet. 
10. Diptera c (Antliata F.). This Order likewise 
appears indebted for its name to the philosopher of 
Stagyra, who distinguishes the members of it from their 
counter-parts — the Hymenoptera — by their having an 
oral, while these have an anal sting d : and we may add, 
that while the last, on account of their wonderful eco- 
nomy and the benefits which by them Providence con- 
fers upon mankind, have been justly regarded as the 
princes of the winged insect world, — the former, when 
we consider the filthy and disgusting habits of their 
grubs, and the annoyance, both from their numbers and 
incessant assaults, of them, in their fly-state, may very 
properly be considered as its canaille. Almost all the 
tribes of Hymenoptera, from the saw-flies to the ants, 
have their representatives in this Order. Though the 
number of wings is its prominent feature, yet there are 
two- winged insects in other Orders, as some Ephemera ; 
and the Eproboscidea of Latreille seem rather a kind of 
winged Aptera, if we consider their tropin, than real 
Diptcra ; or they may form an osculant group, partly 
winged and partly apterous, between the two. I have 
before remarked, that though, apparently, the insects of 
» Vol. I. p. 65—. " Vol. III. p. 468. 
r From lt$, twice, or double. '' Hist. Animal. 1. iv. c. 1, 2/. 
