A. D. Imms 



219 



are present; they are peg-like in form and measure -049 mm. long and 

 •007 mm. wide across the middle region (Text-fig. 2). 



The mandibles (Text-fig. 3) closely resemble one another. At its base, 

 each is flattened and plate-like and measures -07 mm. in breadth; 

 apically it is drawn out into a straight spine-like piercing tooth, beset 

 with minute spines along a portion of its antero-posterior margins. The 

 mandible measures, from the apex of the tooth to the condyle, -11 mm. 

 in length. 



Fig. 2. Right antenna of a fully grown Fig. 3. Right mandible of a fully grown 

 larva : highly magnified. larva, x 300. 



Fig. 4. Ventral view of the labium and 1st maxillae of a fully grown larva; x600. 

 Z, labium: to, 1st maxiUa (left): p, sensory (?) papillae. The dotted lines indicate the 

 position of the underlying head skeleton. 



The ynouth is bounded dorsally by the labrum, laterally by the first 

 maxillae, and its floor is formed by the labium. The labrmn is an oblong 

 transverse plate, slightly curved and measures -13 mm. from side to side, 

 and -04 mm. in the antero-posterior direction. The first maxillae (Text- 

 fig. 4) are extremely simple and their ventro-lateral margins are closely 

 applied to the sides of the labium. No traces of galeae or laciniae are to 

 be found, neither is there any division into basal sclerites. Near to its 

 outer free margin each maxilla carries a papilla (p) arising from a divided 

 basal ring of chitin measuring -015 x -Oil mm. This structure occupies 

 the same position as the group of small papillae found in the young 



15—2 



