297 



2. The alphabetioal order is not so fixed iu the iniud as to 

 prejudice one in regard to homology. 



lle distinguishes : 

 Priiiiarj/ setae on the newly hatched larvae. 



SubpriDKir)/^ appearing after one nioiilt, but fairly constant (/c/., b). 

 Secondanj, no constant position bnt scattered, very rare in the 

 first instar. 



PI. X fig. 15 shows Fracker's indication best. 



The above-mentioned writer thinks it justifiable to conclude 

 from the setae on the prothorax of the Tortricidae (1. c. fig. 39), 

 Aegeriidae and Yponomeutidae (1. c. fig. 35), that e remains in its 

 place and p moves forward towards it, whilst in the Macrolepi- 

 doptera the opposite movement is to be nöted. In the latter s has 

 migrated back to p on the fullgrown larva, whilst they are far 

 away from each other on the newly hatched larva (1. c. p. 34). 



He therefore thinks that, for instance, in instar I the first seta 

 over the stigma of Fel f la (/hmdaria, is not 7 or f but p (see PI. 

 X, fig. 17). 



On the mesothorax and the metathorax also he arrivés at con- 

 clusions, which difïer from those of former writers. 



These diflFerences have been expressed in his figures, which 

 are kept very diagrammatic. Seta p as well as seta (3 is always 

 turned caudally, whilst x and s point in an oral direction. These 

 figures already suggest the hypothesis proposed by Fracker. 

 For the formation of an unprejudiced opinion it is therefore pre- 

 ferable to pay exclusive attention to the points of implantation 

 of the setae on the skin. 



I also wish to draw attention to PI. X, fig. 16 which agrees 

 with Fracker's PI. V fig. 36, the mesothorax of Atteva aurea 

 ( Yponomeutidae). 



Fracker sometimes unites the setae into several groups : 



B = ;*j 4- /3. K = ^ -\- x + y,. P = f -f p. 



n = V + TT (on thorax), v + tt -\- r (on abdomen). 



T = r + (p -f 03. 



Before proceeding to the nomenclatures I should like to 



