60 R. NEWSTEAD—THE PAPATACI FLIES (PHLEBOTOMUS) 
deeply and broadly channelled but does not appear to possess interlocking teeth 
or other structures. The hypopharyns (fig. 3, hy) is similar in width and 
general form to the labrum, but tapers off much more gradually towards the end 
and the marginal spinose teeth are much shorter and placed so closely together 
as to present a finely serrated edge; its upper surface is distinctly and broadly 
concave or trough-like and the salivary duct which is small, occupies a central 
Fig. 3—Mouth-parts of Phlebotomus pupatasii, 2 ; 1b, labium ; /br, labrum-epipharynx ; 
hy, hypopharynx ; md, mandible ; mz, maxilla. The uppermost figure represents 
the labrum and hypopharynx of the male, as seen in profile. 
position, The mandibles (fig. 3, md) are broad and blade-like, and have the outer 
edges faintly serrated, the serrations being rather widely separated. When at 
rest they lie, apparently, superimposed one over the other. The mazillac 
(fig. 3, ma) are much narrower than the mandibles, curved transversely, and 
attached to a broad trough-shaped sclerite, not to a long slender stalk as Grassi 
has shown. One edge is provided with five relatively large and widely separated 
teeth ; the opposite edge with smaller ones set closely together. 
