iS94.] 
335 
[Packara 
tube, and is important in affording an outlet for the .salivary 
gland into the mandibles. The two salivary ducts pass as a 
slender furrow along the inner side of each mandible, becoming 
at the base a closed canal and extending within the head to the 
salivary glands situated in the thorax." 
nix.p 
-\-mx.p 
Fig. 20. Beak of Vermipsylla. — After Wagner. 
In his account of the '-unpaariges stechorgan," J. Wagner, as 
he states in a footnote, adopts Landois's German name for it, 
"since the homology of this organ is not yet settled." In 
Vermipsylla alacurt he describes it as a chitinous tube, somewhat 
