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 promuscis, 

 which he denominated a rostrum c ; 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, Heteroptera, 

 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- 



VOL. III. p. 417. 



b From viptavy the half. 



c VOL. III. p. 463. Linn. Syst. Nat. Ord. II. 



d If considered as suborders, their denomination should not ter- 

 minate precisely as that of Orders. Perhaps Hemipterita and Hete- 

 roptenta might be an improvement. 



VOL. IV. 2 C 



