SYSTEM OF INSECTS. 385 
** Orders in which all the ordinary Trophi do not occur, 
or the Mouth is imperfect a (Haustellata). 
7. HEMiPTERA b (Ryngota F.). Linne at first con- 
fined this Order to those insects which have a jwomuscis, 
which he denominated a rostrum c ; but afterwards, con- 
vinced that the Orlhoptera of the moderns could not be 
associated properly with the Colcoptera ; 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. Redenominated the 
first of these sections, or rather suborders, Heteroptera t 
and the last Homoptera d . Dr. Leach, observing that 
very considerable differences take place both in the eco- 
nomy and structure of Heteropterous and Homopterous 
insects, followed De Geer in considering them as sepa- 
rate Orders, which he has called Hemiptera and Omo- 
ptera, and in which he has been followed by Mr. Mac- 
a Vol. III. p. 417. 
b From iifitav, the half. 
c Vol. III. p. 463—. Linn. Si/st. Nat. Ord. II. 
d If considered as suborders, their denomination should not ter- 
minate precisely as that of Orders. Perhaps Hewipterita and Hetc- 
ropterha might be an improvement. 
VOL. iv. 2 C 
