4.52 HISTORY OF ENTOMOLOGY. 
10. Exocuwara®. (Macrurous Decapod Crustacea Latr.) 
Mazilie many without the labium, covered by 
palpi. cae 
11. Guossata®.. (Lepidoptera L.) Mouth with a spiral 
tongue between reflexed palpi. 
12. Ryneora®. (Hemiptera Latr.) Mouth with a ros- 
trum, having a jointed sheath. 
13. Anrurata’. (Diptera L., Anoplura Leach., Trachean 
Arachnida Latr. &e.) Mouth with a haustellum 
without joints. 
The Orders of Fabricius are equivalent usually to the 
primary groups of the Linnean Orders, and are regu- 
lated chiefly by the antenna. 
In estimating the value of the above system, we must 
bear in mind that, according to the statement of its au- 
thor, it was intended to be partly artificial and partly 
natural: artificial as to its Classes and Orders ; natural 
as to its genera, species, and varieties*. He admitted, 
however, that natural Classes, &c. do exist; but he con- 
tended that artificial ones should be substituted for them, 
till further discoveries had cleared the way for their sa- 
tisfactory developement‘. As therefore his system, in 
its primary and secondary groups, was confessedly arti- 
ficial, and the only use ofan artzficial system being to fa- 
cilitate the study of any department of Natural History, 
its value must be estimated by the facilities it affords to 
the entomological student. But here, it must be allowed, 
* EZ, Without, and Tvedos. b Tadaoce, A tongue. 
© “Puyxos, A rostrum. 4 Avtarre, A pump. 
¢ Dispositio insectorum sistit divisiones s. conjunctiones eorum, 
et est aridficialis que Classes et Ordines, et naturalis que genera, 
species, et varietates docet. Philos. Entomol. vi. §. 2. * Ibid. §. 7. 
