a Family of Coleopterous Insects. 679 



EXPLANATION OF TAB. XXXIII. 



Noie. — The Figures are all more or less magnified. The lines near the Insects 

 figured represent their natural size. The same small letters refer to the correspond- 

 ing or analogous parts throughout the dissections, as follows : 



a. The labrum. 



b. The mandibles. 



p. The basal part of the maxilla. 



c. The apical lobe of ditto. 



d. The maxillary palpi. 



e. The mentum. 



e e. The produced lateral angles of ditto. 



f. The labium. 



g. The triarticulate labial palpi. 

 h. The basal scapes. 



i. The place of insertion of the antenna ; with the exposed 

 part of the circular moveable ball above mentioned, 

 upon the upper surface of which, 

 A:. The basal joint of the antennae is inserted. 

 /. The small articulation ? between the basal and terminal 

 joints of the antennae. 

 m. The apical portion or clava of the antennae. 

 n. The eyes. 

 0. The neck. 



Fig. l.to 14. Pentaplatarthrus paussoides and details. 

 Fig. 1. The insect magnified. 



2. The head, seen above ; exhibiting the formation and in- 



sertion of the antennae. 



3. The same, seen from the front, showing the elongation 



of the palpi and the flatness of the antennae. 

 VOL. XVI. -4s Fig. 4. 



