404 liXTRODUCTIOiN TO THE 



pellcd to admit that Entomology has made far more rapid strides in these days than 

 heretofore. Tlic estahhshment of Entomological Societies in France and England has 

 called forth the exertions of many students, \Yho, in every hranch of the science, have 

 added greatly to onr knowledge of these tribes of ainmals ; hut it has been especially 

 with reference to the description of new genera and species that the greatest strides 

 have been made. To attempt, within the very limited space devoted in this edition 

 to the Invertelirated Animals, to give even a list of all the new genera established since 

 18:29, would be useless ; and this portion of the work must therefore necessarily be I 

 treated in a plan somewdiat at variance with that of the vertebrated portion. As we 

 cannot, therefore, give the genera, subgenera, sections, subsections, and other iuferi(jr i 

 groups, wdiich, in the majority of instances, rest upon isolated structural characters, I 

 often of trivial nature (such as the number of joints in the antenna?, the nnmber of ' 

 cells or spaces formed by the veins ot the wings, &c.), I shall confine myself more espc- i 

 ciallv to those natural groups which LatreiUe, in his other works, regarded as " natural 

 families," — groups equivalent in general with the Linnjcan genera, to which but few 

 additions of importance have been made, and of which the knowledge will atford a good 

 and sufficiently general view of Entomology, — noticing, however, their sectional distri- 

 butiiai, and the more remarkatde of the groups now termed genera. 



It is in the tirst place, however, necessary to observe, that the limits of the sub-kingdorn 

 Articulata, and its primary divisions, have recently formed the subjects of much discus- 

 sion. 4'he researches of Drs. Nordmann, ^'. Thompson, and liurmeister have clearlv 

 proved, not only that the C'irrhipedes, placed by L'uvier amongst tlie Mollusca, are, in their 

 earlier stages, active Entomostraca; but ako that the L>;rn<'e;c, placed bv Cnvier amonirst 

 the intestinal worms, arc sinidarly active, and furnished with articulated legs in their 

 early state. The relation of the Annelides with some of the wingless insects has also 

 been strenuously maintained by some writers, who have deemed the internal organisms 

 of higher importance than the circumstance of the limbs being articulated. 



With respect to the primary divisions, or classes, into wdiieh the jointcd-leggcd 

 Articulata (or the Condylojia of Latreille) are firmed, it is to be ob.-erved that Latreille 

 Inniself, in his Coiirs il' Eii/uiiio/ar/ir, puldi-licd siibseipiently to the second edition t'f this 

 work, has modified his views herein set fortli, in the following manner: — 

 CoxDYLorA — {Insciia, Linn.) 



1. ApiRoroii.v. — With more than six feet; destitute of wings. 



Class I. Crustacea. 

 2. 7\rachnides. 

 •3. Alyriapoda. 



2. HnxAroii.v. — Including the single 



Class 4. In.-ecta.* 



Here we find the Alyriapoda, \\hieh Latreille had in this work united with the true 

 insects, raised to the rank of a class, whilst the orders Thysanura and Auoplura (Pani- 

 ii/d, Latr.) still remained with the f airth class. 



Mr. M'Leay, however, has united these two orders with the Myriapoda, forming 



' [W'ltli.iul /machine so muuli i\ci^ht tn coiisiikTiitiuii« n.-stiii,,' lliu^ inilicnte the I^lniiuimlia. Ttiiit tht Myrii,i,iK|:i aru '\iiiilu,^-ous rt. 



....lel)- u|,oa aii;.loLrical rcsi^niblauc'S, tou ofLci, oi a vurj- laiic.lul the rcpIiU'.s is suffiLiei.lly ..yiilciit hy ti ..uiu^r a Scolupyiaira with 



iiatiira.aa stinte of our recent Kiiglish naturalists (M'Leay, Swniiisoii), the pl,eletoti of a Snake, or an lulus uitli a pcrfeft otic {\Tl:ence 

 ,ye may nntice that these four t,rroup8 seeni to represent ttic fourpri- Latreille named the latter Angaiiformes) ; whilst tlte true insects, fur- 

 raary crimps of vertebratetl animals. The Crustacea arc aquatic, ami, nisiied tcitlt wings, at once refresent tiie only oilier ulnced class- 

 as aueh, are aiialot,^ou3 to fishes. The Araehniila arc terrestrial, ami that nf hirils.J 



