NEUROPTERA. 9 
alternately placed by Latreille amongst the Orthoptera and Neurop- 
tera, has been supposed by MacLeay to constitute a passage between 
the two orders; but from what I have already advanced concerning it 
(Vol. I. p. 412. note +), Iam but little inclined to adopt this relation 
beyond one of analogy; if, indeed, the pupa of Mantispa were ascer- 
tained to be active and semicomplete, there might be better grounds 
for this relation. In like manner Mr. MacLeay has considered the 
Panorpideous genus Boreus as a connecting link between the two 
orders ; influenced, indeed, not by the real characters of the insect, 
but apparently by Panzer having called it a Gryllus, and by the in- 
sufficient observation of early authors. There exist, however, nearer 
points of relation between the two orders than those pointed out by 
MacLeay ; thus the genus Termes, in the structure of the mouth, and 
especially the galeated maxillz and labium, is almost identical with the 
Orthoptera. The same may also be said of the Perlidz, which have 
also the posterior wings longitudinally folded, and the extremity of the 
body terminated by articulated filaments; their pupa state is also 
active, and the larva resembles the imago. 
Various plans have been suggested for the classification of this order. 
Latreille, in his various works, has adopted an arrangement founded 
upon the natural habits of these insects, commencing with those “ vi- 
vant de rapine,” at the head of which the Libellulz are pre-eminent, 
followed by Ephemera, which, although destitute of organs of nutrition 
in the perfect state, is predaceous whilst a larva, and is closely allied 
to Agrion in the antennz, form of head, size of eyes, &c. These 
are followed by other predaceous tribes, which are succeeded by the 
omnivorous white ants, and this series is closely followed by the Phry- 
ganee. The peculiarities of these insects in the preparatory states 
‘‘ consolident l’établissement et la suite des familles qui remplissent 
cet ordre.” (Latr. Cons. Gen. p.73.) In the Regne Animal (vol. v. 
p- 234.) we, however, find a more precise sketch of this proposed ar- 
rangement : — 
1. Insectes carnassiers, demi-métamorphose, larves aquatiques. 
2. Insectes carnassiers, métamorphose complete, larves terrestres 
ou aquatiques. 
3. Insectes carnassiers, ou omnivores, terrestres, demi-métamorphose. 
[4. Insectes herbivores, métamorphose compléte, larves aquatiques, 
se construisant des domiciles portatifs.” Phryganea. ] 
In the genera Crustaceorum, the arrangement of the families of 
