95 



Segm. 8. On the place of the s. donutlc^t of the left and right 

 sides, we find the median caudal horn which is white directly 

 after the birth and gets hluck later on. The skin has totally 

 changeil on this spot and is covertnl with numerous, irre- 

 gularly plaeetl small setae. 



I do not think that the caudal horn has exclusively been 

 developed from the two s. donalrs^ which are distinctly 

 to be seen on the top, as two knobs each with a seta, 

 but I am incline<l to consider it as a protubcnuue which 

 has lifted up the «. dorsaUs on its top. 



Besides the horn we find in the usual order: a. sub- 

 doi'saiiSy ». siHjtrdiftif/inalis, n. prostif/malis, a. infrastujmalis^ 

 s. bfwalis, and a. proitrdalin. 

 „ 9 = 1. But s. infrastigmalis is absent, there is only one 



8. boMiis and one ». propedalis. 

 „ 10. iS>. dorsaiis, s. subdorsalis and s. suprustujmnUs on the 

 anal-flap; there is a s. prostiynialix, s. infrastigmalis is 

 absent, one s. i>ed(ili<i. 

 „ 11. Just under the anal-flap a large tuberculum with setae. 

 The seta under it we might take aas. basalis of segment 10, 

 but in connection with the reduced number of setae of 

 segment 9, this does not seem probable to me. I consider this 

 , tuberculum to belong to the ventral part of 11. 

 Instar // and the following instars. 



The primary tubercula and setae have disappeared. The skin 

 is totally covered with small tubercula placed in vertical rows, 

 each of which has a very short seta. 



Recapitulation. Instar / has a primitive setal-pattern, which 

 is nearly the same as that of the other families. The caudal horn 

 has arisen on the place of the left and right setae dorsales which 

 remain visible on the top. "With some exceptions (meso- and meta- 

 thorax) which it is easy to explain, the tubercula bear one seta. 



There is no s. poststigmalis, but we find on the abdominal 

 segment a 8. jjrostignialis. In instar II this pattern is lost and 



