ORISM0I.0GY. 317 
Mandibular; Maxilla:; Maxillary and Labial 
Palpi; and Tongue. — Ex. The Masticating Orders. 
a. Feeders retracted (Tropin retracti). When, in 
a perfect mouth, the Tropin are not capable of be- 
ing much pushed out or drawn in. — Ex. Most Co- 
leoptera, Orthoptera, &c. 
b. Feeders retractile (Trophi retractiles). When, 
in a perfect mouth, the Tropin can be considerably 
pushed forth or drawn in. — Ex. Stenus, Apis, &c. 
4. Imperfect (Imperfectum). When the mouth wants 
any of the Tropin, or they exist in it only as rudi- 
ments. — Ex. The Suctorions Orders. 
5. Elabrate (Elabratum). When an imperfect mouth 
has Mandibular, Maxilla?, Labium, and Maxillary 
Palpi, or what perform their office, but no Labrum. 
— Ex. Araneidea. 
6. Emandibulate (Emandibulatum). When an im- 
perfect mouth has all the Troplii but the Mandi- 
bular. — Ex. Triclioptcra. 
7. Bipalpate ( Bipalpatum ). When an imperfect 
mouth has only either Labial or Maxillary Palpi. 
— Ex. Tabanus, &c. 
8. Expalpate (Expalpattnn). When an imperfect 
mouth has no Palpi. — Ex. Hcmiptera. 
9. Stomapodous (Stomapodum). When the Legs and 
Sternum act the part of Maxilla?, Labium, and 
Palpi. — Ex. Araneidea, Scolopendra, &c. 
a. upper lip (Labrum). 
1. Whiskered (Mystacinum). When the upper lip 
is furnished with whiskers (Mystax), or bearded. 
—Ex. Creopliilus hirtus. Plate XXVI. Fig. 30. 
