FORM" -VXD FUNCTION 



259 



107.) The labium removed, carefully pry apart the two 

 maxillae, endeavoring to obtain the full basal portion. 

 With the aid of a small hand-lens, the following parts 

 may be made out : 



Lacinia. A curved and toothed part, somewhat like 

 the mandibles. (Fig. 169, Le.) 



Galea. Lying laterad or outside of the lacinia is the 

 spoon-shaped galea. The galea is composed of two seg- 

 ments. (Fig. 196, gl.Y 



Palpus. Arising from the basis of the galea is the 

 long five-jointed palpus, or feeler. (Fig. 196, p.} 



Make a drawing of the rear or caudal view of the 

 maxilla 1 , naming all the parts. 



Labium. With the aid of a hand-lens, the labium may 

 be analyzed into the following- 

 parts : 



The two movable flaps, ligula. 

 (Fig. 197, L.) 



The central portion, known as 

 the mentum. (Fig. 197, If.) 



Arising from the basal por- 

 tion of the mentum are the 

 labial palpi. (Fig. 197, Lp.) 



Articulating with the base 



FIG. 197. Labium. g, gula ; 

 S, submentum ; M, mentum ; 

 Pg, palpiger ; Lp, labial palpus. 

 L, ligula, consists of the two 

 flaps below mentum. Enlarged 

 seven and one-half times. 



of the mentum is the cres- 

 cent-shaped submentum. (Fig. 

 197, S.) 



The gula and the palpiger are 

 inconspicuous parts, which will not readily be made out 

 without the aid of a compound lens. 



1 The basal portion of the maxilla is composed of a rectangular sclerite called 

 the stipes, connected at the distal end with the lacinia, and at the proximal end with 

 the small, two- jointed cardo. The larger joint of the cardo is somewhat triangular. 



