A. W. Rymer Roberts 311 



The spiracles are now distinctly elongate, the ventral orifice being 

 often a little shorter than the dorsal. They are longer and proportionally 

 narrower than those of A. obscurus at the same age. At either side of 

 each orifice the teeth or corrugations number 14 to 16 in the thoracic, 

 10 or 11 in the abdominal spiracles. The marginal rims are brown. 



The 9th abdominal segment appears to be narrowed to its apex some- 

 what more gradually than that of /] . obscurus, being widest in the region 

 of the sensory pits. These latter are small, round and surrounded with 

 a brown margin. The cauda is short, but a trifle more acute than that of 

 A. obscurus. At this stage it is slightly yellower than the surrounding 



area of the cuticle. 



Final Instar. 



In general the larva closely resembles that of A. obscurus, already 

 described in Part 11(9). It does not, however, attain the same size, being 

 full fed when of a length of 16-17 mm. and a breadth of 1-1-5 mm. 

 Many specimens are a little darker in colour but this character is not 

 reliable. 



Head with a few shallow punctures and short irregular longitudinal 

 striae above and beneath. Antennae differ from those of the early stages 

 in having the third or supplementary segment shorter in proportion to 

 the other segments and especially the basal one, the proportion being 

 as 25: 9-5: 12-75 from basal to third segment. Mandible somewhat nar- 

 rower in proportion to its length than that of A. obscurus, but the differ- 

 ence is not very marked. Both species have the posterior one-third on 

 the ventral surface minutely and rather closely punctulate. 



The anterior portion of the cephalic plate, which overlies the base of 

 the mandible on either side, is in A. sputator rather more pointed at the 

 apex than in A. obscurus. 



By an unfortunate mistake the semi-membranous lining of the palate 

 was described in Part II (p. 206) as the floor of the mouth. The "anterior 

 margin " appears to represent a suture found a short distance behind the 

 sub-nasal process, while the tufts of bristles referred to are in reality a 

 portion of those at the anterior margin of the cephalic plate, on its 

 ventral side. The real floor of the mouth is a membranous structure lined 

 with fine hairs and situated behind the base of the laciniae, above 

 (dorsal to) the mentum. 



The anterior portion of each tergite, with the exception of that of the 

 prothorax, is minutely granulate (Plate XIII, fig. Ix). On the meso- and 

 meta-nota and abdominal tergites 1-8 the granulations extend in a trans- 

 verse band from the intersegmental membrane to a line of minute pores 



