r 



OF THE ANNULOSA. 403 



exactly the same rate of progression. Looking at the 

 Hemiptera, we necessarily must compare some in their 

 aspect to Coleoptera, others to Blatta, but few to the true 

 Grylli. Nay, these have more similarity in the form of 

 their head and external structure to Homoptera than to He- 

 miptera, and the Homopterous insects, which resemble 

 most in their perfect state the Neuroptera, are perhaps 

 those which compose Latreille's second family. To be 

 brief, but I fear more abstruse, it may be said that in that 

 space of the series of Haustellata, which intervenes be- 

 tween the Ap)tera and hepidoptera, the analogy of external 

 appearance with the Mandibulata commences a little 

 nearer to the Aptera than that of metamorphosis. A cir- 

 cumstance, however, which makes me almost sure that 

 there is some rule in this, is to observe that in the other An- 

 nulose columns symptoms of the same apparent irregularity 

 are visible, and always in the corresponding space, that is, 

 between the second and fifth orders, as they are disposed in 

 page 392. What also deserves remark is, that this space 

 nearly, if not altogether, coincides with half the column, and 

 its extremities are the opposite points of the class, which, 

 according to what has been said of such circles, always 

 approach to each other, if they do not even meet. This 

 we see in the disposition of Cocci and other Homopterous 

 insects to come in between the Aptera and Diptera, and 

 likewise in the relation which holds good between Ter- 

 mites and Ants; or still better perhaps between Psoci, 

 the larvae oi Coleoptera, and Anoplura, which, by the by, 

 appear to affoni a parallel for the relation betv/een Aranea, 

 Pi/cnogonum, and Phulangium. 



The greatest fault, however, of the tabular view above 

 "gixcw is my uncertainty, not only with respect to the 



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