EXTERNAL ANATOMY OF INSECTS. 355 



I. CAPUT (The Head). 

 The Head is the anterior section, of the body; con- 

 sisting of a kind of box without suture or segment, which 

 receives the organs of sensation and manducation. It 

 includes the Os, Fades, 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 Trophi a . 



1. Trophi (the Trophi). The different instruments or 

 organs contained in the mouth, or closing it, and 

 employed in manducation or deglutition. They in- 

 clude the Labrum, Labium, Mandibular, Maxilla', 

 Lingua, and Pharynx. 



A Labrum (the Upper-lip). A usually moveable or- 

 gan ; which, terminating the face anteriorly, covers 

 the mouth from above, and is situate between the 

 Mandibular h . It includes the Appendicula. 



a Appendicula (the Appendicle). A small piece some- 

 times appended to the upper-lip c . Ex. Halictus ? 

 Walck. {Melitta **. b. K.) 



B Labium (the Under-lip). A moveable organ, often 

 biarticulate, which terminating the surface ante- 

 riorly, covers the mouth from beneath, and is situ- 

 ate between the Maxilla: d . It includes the Men- 

 tum, and Palpi Labiales. 



a Mentum (the Chin). The lower joint of the Labium, 



a We employ this term instead of Instrumenla Cibaria ¥. 3 to avoid- 

 circumlocution. 



*> Plates VI. VII. &c. a', and XXVI. Fig. 30-33. 

 e Ibid. Fig. 30. Mon. Ap. Angl. i. 139. Melitta **. b. t. ii./. 4 S 5. 

 •' Plates VI. VII. &c. and XXVI. Fia. 23—29. b'. 

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