BY R. J. TILLYARD, 



797 



carries a single hooked liair on its inner side, and there is a 

 larger one situated just below it. Five or six smaller hooked 

 hairs are situated on either side of the middle line, upon the 

 basal portion of the labium. 



This basal portion of the labium remains undivided through- 

 out all stages in Psychopsis, and probably represents both 

 inentum and subinentum combined. 



Text-fis.'").^ 



Text-fi.i^.O.t 



7'he Body- Armature (Text-figs. 7, 8). We have already de- 

 scribed the peculiar hooked hairs, set upon raised papillae, which 

 are found upon the head of the larva. They also occur upon the 

 hard tergal plate of the prothorax, which is formed of tough 

 dark brown chitin, like that of the head. Upon the rest of the 

 thorax, and upon the abdomen, these hairs are almost entirely 

 replaced by more highly specialised structures, which I shall call 

 dolichasters (Greek SoA-iyo?, long; and da-ri'ip, a star). The doli- 

 chaster is a more or less elongated, hollow, chitinous structure, 

 set upon a definite papilla; it is very narrow at the base, but 

 expands distad in narrow pyramidal form, and ends distally in 

 from four to nine sharply projecting points, which pass beyond 

 the general periphery of the enclosing chitinous membrane. 



Labium and clypeus of larva of Ps, eleyans (Guer,), third instar; ( x 30). 

 t liabium of larva of P.s. e/egaiis (dui'-r. ), third instar; ( x 30i. 



b'2 



