A. M. Altson 101 



There are several large setae symmetrically arranged on the 9th and 

 10th segments, which act as "hatching spines" (hs). 



The larval integument of the thorax and abdomen appears minutely 

 punctured (Text-fig. 1, 6). 



Description of Second Instar Larva. 



The following description — based on the examination of balsam 

 mounts — is comparative and only points of difference with the first 

 instar larva are referred to. 



The second instar larva (Text-fig. 2, i) is similar in appearance to the 

 later stages, that is, it is arched. It is subcyHndrical, and is creamy 

 white in colour, except towards the apex of the abdomen dorsally, where 

 the ahmentary tract filled with wood tissue gives it a coloured area, the 

 colour depending upon that of the wood on which it has been feeding. 

 The chaetotaxy is more complex than in the first instar. 



The head (Text-fig. 2, 2 a) is slightly rounded from a lateral aspect. 

 The frontal (fs) and epicranial (es) sutures are fairly pronounced. The 

 antenna (Text-fig. 2, 2 b) differs from that of the first instar, the apical 

 dorsal piece (a^) is longer than the venter piece (a^). The trophi are of the 

 same type with a variation in the number of and arrangement of the 

 setae. The eyes (e) are more pronounced. The epistomal and clypeal 

 sutures were not discernible. 



The thorax (Text-fig. 2, i) is clearly defined. Each segment is com- 

 posed of scutal (x), scutellar (z), prescutal (o), epi-pleural {g), and sternal 

 (h) lobes. The apical joint of the pro-thoracic leg {pi) bears six bristles 

 and the terminal seta (Text-fig. 2, 3); the apical joints of thcmeso- (msl) 

 and metathoracic legs (fntl) bear three bristles and a terminal seta. 



The abdomen (Text-fig. 2, i). Segments one to four are composed of 

 scutal (x), scutellar (2), prescutal (0), epi-pleural {g), and sternal {h) lobes; 

 segments five to eight of scutal (x), scutellar (2), epi-pleural (^r) and ster- 

 nal (h) lobes. No row of setae was found on segments one to four, but 

 these are present on five to eight. Each epi-pleural fold bears two setae. 

 The 9th and 10th segments (Text-fig. 1, 4) do not bear any fleshy pro- 

 tuberances and no setae appear on the last segment. 



The integument of the thorax and abdomen is covered with sym- 

 metrically arranged rows of minute chitinised scales (Text-fig. 2, 4). 



Observations on the Larvae. 

 First Instar. As soon as the young larva is fully developed, it 

 commences feeding upon the residual-yolk-mass whilst still enclosed 

 within the chorion, w^hich is soon broken at the posterior pole by its 



