Phreatoicoides. 129 



succeeding six or seven ; more distally they become gradually 

 longer up to the penultimate, which is somewhat longer than the 

 first. Each bears at its distal margin a circlet of short setae. 

 The terminal joint is short, and bears on its summit a few longer 

 setae. 



T/ie Upper Lip (Fig. 2). — The upper lip is large and strong, 

 broader than long, and regularly I'ounded at its distal end. The 

 extremity is not produced as in P. australis. The front margin 

 is thickly fringed with fine setae which also clothe the front inner 

 surface. 



Mandibles (Figs. 3 and 4). — The mandibles differ in no essential 

 respect from P. australis and P. terricola. From their basal 

 attachment, which is very wide, they project directly downward 

 and curve inward. On each, at about half their length, a molar 

 tubercle arises from the inner concave surface, and, when the 

 mandibles are closed, the summit of one meets that of the other 

 in the mid axis. The distal or lower half of each of the 

 mandibles rapidly becomes attenuated, continuing downward and 

 curving inward, at the same time twisting round somewhat hind- 

 ward, to form at their apices the cutting teeth. These also meet 

 together at the mid axis, but more ventrally than the molar 

 tubercles. The anterior margin is somewhat convex ; the hind 

 margin gradually becomes narrower as it approaches the position 

 of attachment of the molar tubercle, and is then sharply and 

 deeply cut forward, and then continued downward to the distal 

 extremity. The basal angular piece remaining at the base of the 

 molar tubercle is densely clothed with short setae. Near the 

 basal attachment of each mandible and close to the anterior 

 margin arises a three-jointed palp, which is directed forward and 

 downward. (In the figures they do not lie in their normal 

 position, the ends being displaced somewhat by the pressure of 

 the cover slip used in examination). The first joint is short, the 

 second three times longer, and the third slightly longer than the 

 first. This joint has its upper margin convex and free from 

 setae, and on the under margin there is a double row of setae, the 

 first two or three distal ones being very long and incurved, but 

 more proximally they gradually decrease in length. The second 

 and first joints have their upper borders fringed with very short 

 setae, the under border of the first joint bears two or three 



