The Spectres of Stoll (_Phasma_ F.) are so strikingly analogous to another crustaceous tribe, the _Læmodipoda_, particularly the genus _Caprella_, that Montagu gave one species the Trivial name of _Phasma_[401]. The jumping _Amphipodiform_ Crustacea are represented extremely well by _Gryllus_ L., and the _Stomapodiform_, particularly _Squilla Mantis_, by _Mantis_. The resemblance in this last instance is so very striking, that it cannot escape the eye of the least intelligent observer. Orthopterous insects may perhaps one day be discovered analogous to the two other crustaceous orders, the _Decapods_ and _Branchiopods_; but at present I know of none of that description.
_Hemiptera._ The larvæ of this order, which in general resemble the perfect insect, except that they have no wings, seem most commonly to belong to the _Anopluriform_ type[402]; but the _Aphides_, _Chermes_, and _Thrips_ may, I think, be regarded as more analogous to the genera _Podura_ and _Sminthurus_ in the _Thysanura_[403]. I have some suspicion that the _Nepidæ_, _Naucoris_, and the remipedes, _Notonecta_, _Sigara_, &c. may find their prototypes amongst the _Crustacea_; but my confined knowledge of the latter does not enable me to point to any individual genera or tribes that they may be presumed to represent.
_Neuroptera._ As the kinds of larvæ of the different tribes composing this order, as it now stands, are very various, it is to be expected that the analogical forms they represent are equally so. The _Libellulina_ MacLeay (whose metamorphosis that gentleman has denominated _subsemicomplete_, a term warranted by their losing in their perfect state the mask before described[404]) in their oral organs, particularly by their galeate _maxilla_ and distinct _ligula_[405], have some relation to the _Orthoptera_, the prototypes of whose larvæ we have found amongst the _Crustacea_: probably, therefore, those of the tribe in question lurk in that class; a suspicion that receives strong confirmation from the larva of _Agrion_[406], which in its tapering body and anal natatorious laminæ represents a shrimp. The larvæ of that very peculiar and distinct tribe, the _Ephemerina_, appear to be intermediate between the _Stomapodiform_ and _Thysanuriform_ types. Their natatory respiratory abdominal laminæ seem copied from the former, and their anal diverging setæ from the latter[407]. The _Myrmeleonina_, as well in their general form as in their motions and habits, present a most singular analogy with the tribe of spiders, as does also in some respect that of _Cicindela_. With regard to _Panorpa_, which Mr. MacLeay remarks is related to _Myrmeleon_[408], and is a most ferocious insect[409], as its larva has not yet been discovered, nothing certain respecting its analogical form can be asserted; but should it, like the male fly, represent the scorpion, both orders of _Arachnida_ will have their representatives in the class we are considering. The _Corydalina_, as far as the larva of _Hemerobius_ instructs us, is _Chilopodiform_, but with a tendency to the _Araneidiform_ Type. The _Ametabola_ also furnish the prototype of the next tribe, the _Termitina_, which, as is evident both from _Psocus_ and _Termes_, are perfectly _Anopluriform_. The _Sialina_, or _Plicipennes_ of Latreille, excluding _Trichoptera_ Kirby, appear to me to be intermediate between the _Chilopodiform_ and _Stomapodiform_ Types, and not without some relation to the _Thysanuriform_. Their pediform, jointed, respiratory abdominal appendages, their head and falcate mandibles, seem copied from the first tribe. The same appendages considered as organs of respiration, and their taper forks, are moulded upon the plan of the _Stomapodiform Crustacea_, and the long seta which terminates the abdomen is upon the _Thysanuriform_ plan[410].