310 TJie Life History of " Wireivorms" 



The Cauda, though colourless at first, later becomes slightly tinted 



with yellow. Its shape affords a slight means of differentiation, for while 



that of obscurus is blunt, it is distinctly pointed, though quite short, in 



sputator. 



Third Instar. 



In the early part of the third instar the larva is about 6-5 mm. in 

 length (nearly the same as A. obscurus at the same age), and of a pale 

 yellow colour, though this appears to vary somewhat with the individual. 

 In section it is considerably more rounded than specimens in the first 

 instar, but is slightly flatter on the dorsal and ventral aspects than at 

 the sides. In general the larva may be distinguished from that of 

 A. obscurus by its coarser punctuation and by its longer and proportion- 

 ally narrower spiracles. 



The head is rather smooth and its setae of the posterior are longer 

 than those of the anterior row. Length of segments of the antennae as 

 25: 13:21, taking the basal, second and supplementary segments. Eyes 

 situated in a line with the anterior pair of setae and behind the antennae. 

 The mandibles appear to be somewhat sharper-pointed and more curved 

 on the outer margin than in A. obscurus at the same age. The nasale is 

 distinctly tridentate, with the middle tooth extending considerably 

 further forward than the two lateral teeth. The sub-nasal process is not 

 well defined: in one specimen examined it consists of five rounded teeth 

 borne in an almost straight line at the base of the nasale, the middle 

 tooth being a little more prominent than the rest. 



The tergites are coarsely punctured with irregularly-shaped punc- 

 tures, while the anterior margin of each of the abdominal tergites 1-8 

 bears a fine and close granulation, which extends backwards as far as 

 the spiracles. This granulation is also present on the 9th abdominal 

 tergite, though the remainder of the tergite is less strongly punctured 

 than that of any other abdominal segment. It is absent from the pro- 

 notum, but present on the meso- and meta-notum, where is extends to 

 the anterior row of setae. 



The sternites are more sparsely punctured than the tergites but bear 

 a few punctures and also a few somewhat irregular transverse rugae. 

 The posterior margin of the prothoracic sternite behind the coxae and 

 the whole of the meso- and meta-thoracic sternites bear fine granulations. 



All the setae are yellowish. Those of the pronotum are about equal 

 in length as between the anterior and posterior rows, while in the first 

 eight abdominal segments the posterior row is the longer. None is as 

 long as the segment to which it belongs. The ventral setae are short. 



