376 SYSTEM OF INSECTS. 
Trophi in most not used for mastication *. 
Wings four : neuration generally areolate”. 
Prothorax obsolete, giving place to an ample 
collar. 
Tarst pentamerous. 
Ovipositor 5—6-valved, the vagina darting 
forth two retroserrulate spicule. 
** Orpers in which all the ordinary Trophi do not occur, 
or the Mouth zs imperfect. 
7. Hemiprera’ (Ryngota F.). Linné at first con- 
fined this Order to those insects which have a promuscis, 
which he denominated a rostrum; but afterwards, con- 
vinced that the Orthoptera of the moderns could not be 
associated properly with the Coleoptera ; instead of form- 
ing them into a distinct Order, as nature would have 
dictated—perhaps to avoid the multiplication of Orders 
and without altering his definition—with equal infelicity 
he added them to this. Subsequent Entomologists, who 
saw the impropriety of masticating insects thus herding 
with suctorious ones, restricted the Order to its old limits ; 
but Latreille very judiciously altered its arrangement, 
and divided it into two Sections, separating those whose 
hemelytra terminate in membrane, from those in which 
they are mostly tegmina, or of a substance intermediate 
between that of the elytra of Coleoptera and that of the 
wings of the Tetrapterous Orders. He denominated the 
first of these sections, or rather suborders, Heferoptera, 
* The Hymenoptera, though they have all the usual oral organs, can- 
not be denominated masticators generally ; these organs, especially 
the mandibles, being chiefly used in their economy. 
» See above, p. 341. * Vou. ILI. p. 418. 
4 From guicv, the half. © Vot. IIL. p. 464—. Linn. 
Syst. Nat. Ord. VI. 
