W. Ritchie 177 



On each side of the labrum and partly overlapped by it, are the 

 mandibles. Each mandible (>//.) is dark brown in colour, highly chitinized 

 and bears three teeth, the posterior one being the smallest. 



On the ventral aspect of the head lie the maxillae (Fig. 6). 



1st Maxillae: These lie one on each side of the labium and are com- 

 posed of the usual three parts: posteriorly the cardo (c), more anteriorly 

 the stipes (.<?.), bearing a three-jointed maxillary palp {inx.p.) and a few 

 scattered bristles, and thirdly the lacinial lobe [la.) which has a number 

 of stout chitinous bristles on its outer margin. 



2nd Maxillae: In the centre of the field lies the labium or fused 2nd 

 maxillae, made up of the mentum (w.) with two labial palps (l.p.) each 

 two-jointed and with the ligulae (l.) lying between them. Posterior to 

 the mentum is the submentum (s.wi.), often indistinct from the submental 

 area (s.a.) which lies still further back. 



The Thorax (Fig. 3 b). 



The thorax of the larva is made up of the usual three segments, 

 namely the prothorax, lying behind the head, the mesothorax, and the 

 metathorax. 



In a side view of the prothorax (Fig. 3 d) one can make out the 

 following five folds: the scutellar (scr.) forming the dorso-lateral portion 

 and bearing the rectangular patch of fine hairs already referred to; 

 the scutal {sc.) bearing a spiracle on its most ventral portion; the 

 epipleural (ep.) and the hypopleural {hp.) forming the lateral portion 

 (the two last-named folds are more ventral than tha first) ; the sternellar 

 (sr.) forming the ventral portion. 



The mesothorax (Fig. 3 e) in side view shows six folds: the prescutal 

 (ps.) forming the anterior dorsal portion: the scutellar (scr.) forming the 

 dorso-lateral portion: the scutal {sc), epipleural {ep.) and hypopleural 

 {hp.) forming the lateral portion; the sternellar {sr.) forms the ventral 

 portion. There are no spiracles borne by the mesothoracic segment. 

 The metathoracic segment (Fig. 3/) is similar to the mesothoracic in 

 structure and is of a corresponding size and shape. 



The Abdomen (Fig. 3 c). 

 The first seven abdominal segments are similar in structure although 

 they vary in size. In side view each segment shows seven folds: the 

 prescutal {ps.), scutal {sc.) and scutellar {scr.) form the dorso-lateral 

 portion; the epipleural {ep.) and the hypopleural {hp.) form the lateral 

 portion: while the sternal {st.) and the sternellar {sr.) form the ventral 

 portion. On each segment, between the epipleural {ep.) and the scutal 



