SOUTH AFRICAN BAG WORMS. 



181 



1 and 5. Relative positions of setfe the same as in the first 

 instar (text-fig. 12, b). 



The distinctive pattern on the head is shown in text-fig. 12, a. 

 It does not lend itself readily to description. 



Thorax. — Pattern of dorsal thoracic plates as shown in 

 text-fig. 12, H. Relative positions of setas correspond to 

 those described for A. junodi. Prothoracic spiracle piercing 

 the dorsal shield. 



Abdominal Segments. — Transversely wrinkled on 

 dorsal aspect. Segment 3 with one, posterior 4 and 5 with 

 two, and 6 with one, anterior, transverse pustular bands. 

 The arrangement of the seta3 and setiferous plates similar to 

 that of A. junodi. Anal plate uniformly coloured. Hooks 

 of prolegs numerous, arranged in a single loop, opened medio- 

 caudally. The number of abdominal booklets is not constant, 

 as shown in the following table : 



Those on the anal legs in the two specimens examined 

 range from 20 to 23 ; those on the abdominal legs from 

 18 to 24. 



Ultimate Instar (Male). 



Length 22 to 25 mm. Colour pale ; ground colour pinkish 

 buff (XXIX), markings on head and thoracic shields only 

 faintly indicated in sayal brown (XXIX) and bister (XXIX) ; 



