258 



H. TETLEY. 



II. Mouth-parts of the Female (text -fig. 2). 



(1). Mandible (PL vi, fig. 2). — A strong chitinous blade 10 mm. in length, with the 

 greatest width (near the base) of "53 mm., and tapering gradually towards the 

 apex ; the width half-way along its length being '30 mm. At '2 mm. from the 

 apex, it narrows more abruptly to a sharp point, which is more strongly 



Fig. 2. Lateral view of the head of P. longirostris, $ (X 5) : a, antenna ; e, eye ; 

 h. hypopharynx ; J, labium; le, labrum-epipharynx ; m, mandible; mx, maxilla; 

 p, maxillary palp. Owing to its great length only the proximal portion of the labium 



is shown, 



chitinised than the rest of the blade. Very small teeth are found on both 

 sides of the apex ; those on the inner side extend to a distance of '1 mm., but the 

 outer ones occur as far down as 3 '2 mm. from the tip of the mandible, and then 

 become minute (text-fig. 3). 



Fig. 3. x\pex of left mandible of $ 

 greatly enlarged. 



The inner edge of the mandible is produced proximally into a strongly chitinised 

 rod which articulates with a second much shorter rod. From the proximal end of 

 the outer edge there arises another short, curved and pointed rod, which, together 

 with the projection from the inner edge, forms a horseshoe-shaped end to the 

 mandible, in which the inner end of the horseshoe is prolonged beyond the outer 

 one. To this outer projection the abductor rectus muscle is attached. 



(2). Maxilla (PL vi, fig. 3). — This is composed of a cardo, stipes, lacinia, galea 

 and palp. Of these, the cardo is articulated with the head skeleton at a point 



