EXTERNAL ANATOMY OF INSECTS. $55 
where it is jointed; in other cases its base. It is 
usually seated between the base of the Mazille*. 
b. Patri Lastates (the Labial Feelers). Two jointed 
sensiferous organs, the use of which is not clearly 
ascertained, which emerge, one on each side from 
the Labcum, mostly near its summit». 
C. Manpipuia (the Upper-jaws). Two transverse late- 
ral organs, in most insects used for manducation ; 
generally corneous, moving horizontally, and clos- 
ing the mouth above, under the Labium*. They 
include the Prostheca, Dentes, and Mola. 
a. ProstHeEca (the Prostheca). A subcartilaginous pro- 
cess attached to the inner side, near the base, of the 
Mandibulea of some Staphylinide 4.—Ex. Ocypus 
similis, Creophilus mawxillosus, &c. 
b. Denes (the Teeth). The terminating points of the 
Manbibule. ‘They include the Incisores, Laniari?, 
and Molares*. 
A. Inctsores (the Cutting-teeth). Teeth somewhat 
wedge-shaped, externally convex and internally 
concave ‘.—Ex. Gryllotalpa, Gryllus, &c. &c. 
* Prates VI. and VII. a", and XXVI. Fic. 34, 35. 
The part in this work regarded as the mentum, does not in all 
cases accord with what MM. Latreille, Savigny, &c. have regarded 
as entitled to that denomination. Thus in Hymenoptera, their 
Mentum is what we term the Labiuwm, while our Mentum is the 
small piece upon which that part sits (Pirate VII. Fic. 3. a"). This 
is called the Fulcrum in Mon. Ap. Angl. (See i. Explan. of the 
Plates.) Our Mentum may generally be known by its situation be- 
tween the hinges and base of the Mazville. 
> Prates VI., VII., and XXVI. b". © Jbid. 
oPrare MIT. Pre. 7..e". 
* Marcel de Serres Comparaison des Organes de la Mastication des 
Orthoptéres. 7. Ann, du Mus. 11. ~ 
f Prate VI. Fic. 6. c’, a!", and XIII. Fic. 5. a!". 
J Ai? 
