28 



ANATOMY OF THE SUGAR LOUSE. 



Fig. 1. Fig. 2. 



Fig. 3. 



The mouth consists of two upper and two under jaws; and of one 

 upper and one under lip. The upper jaws (kinnbacken) are roundish 

 and somewhat curved, conical at the base, and furnished at the tip 

 with five teeth (m, m, fig. 1). The under jaws (kinnladen) are bulged 

 behind (7, fig. 2), but taper off to a sharp point at the tip (/c), with a 

 moveable, pointed, and somewhat curved member (g), arising at the 

 base of a long, thread-shaped five jointed feeler. 



The upper lip is triangular, and divided crosswise into four portions, 

 which are moveable on the under part (a, fig. 1). The under lip is 

 bluntly triangular, ends on the fore part in four small lobes (n, x, fig. 

 3), and is furnished with two four jointed feelers, the tip joint of which 

 is club-shaped and remarkably thick (h f fig. 1, and a, b, c, d, fig. 2). 



Fig. 1. 



The digestive canal runs in the form of a narrow tube (A, B, fig. 1) 



