354 EXTERNAL ANATOMY OF INSECTS. 
I. CAPUT (The Heap). 
The Head is the anterior section of the body; consist- 
ing of a kind of box without suture or segment, which 
receives the organs of sensation and manducation. It 
includes the Os, Facies, Subfacies, and Collum. 
i. Os (the Mouth). That part of the head which re- 
ceives and prepares the food for passing into the 
stomach. It includes the Trophz*. 
1. TRoput (the Trophz). ‘The different instruments or- 
organs contained in the mouth, or closing it, and 
employed in manducation or deglutition. ‘They in- 
clude the Labrum, Labium, Mandibule, Mazilla, 
Lingua, and Pharyne. 
A. Lasrum (the Upper-lip). A usually moveable or- 
gan; which, terminating the face anteriorly, covers 
the mouth from above, and is situate between the 
Mandibule®. It includes the Appendicula. 
a. APPENDICULA (the Appendicle). A small piece some- 
times appended to the upper-lip*. Ex. Halictus ? 
(Melitta **.b). 
B. Lasrum (the Under-lip). A moveable organ, often 
- biarticulate, which terminating the surface ante- 
riorly, covers the mouth from beneath, and is situate 
between the Mazille*. It includes the Mentum, 
and Palpi Labiales. 
a. Mentum (the Chin). The lower joint of the Labium, 
2 We employ this term instead of Instrumenta Cibaria F., to avoid 
circumlocution. 
>’ Prates VJ. VII. &c. a’, and XXVI. Fic. 30—33. 
© Tbid. Fie. 30. Mon. Ap. Angl. i. 139. Melitta **. b. t. ii. f. 4, 5. 
4 Prates VI. VIL. &c. and XXVI. Fic, 23—29. b’. 
