805 



investigators to bc x. siilx/orsdlis^ rcinovod to tlic front-border 

 of the segment. But agaiust this explaiiatioii I have an ol)jectioii 

 for the follüwing reasons : 



1'\ In ditferent families there appear on the abdonum tliree 

 setae above the stigma: e. g. Phalera bucephala, HcjJ/alus^ Pieris 

 naj)i and the Psychidae. 



2°. On the prothorax we very reguhirly find .s. dorHolateralis 

 together with s. stibdorsalis. 



3". On all the pupae of Rhopalocera, which I have examined 

 and which possess a pattern, I could show three elevations or 

 pigment-spots on the oral side of the abdominal segments, above 

 the stigma. At the same time there exists a spot or an eleva- 

 tion, agreeing with s. siihdorsalis. 



In all three cases it is evident, that the middle one of the 

 three setae is not s. subdorsalis. This seta I have called s. dor- 

 solateralis. 



At first I hesitated whether we could possibly explain this 

 seta in another way, namely by calling the upper one s. dorsaUs, 

 the next one s. suprastigmalis and by considering the third one 

 as agreeing with III B of Quail. I thought at first that III B 

 had changed its place and had come above the stigma and by 

 this transgression had caused a dorsad motion of s. suprastigmalis. 

 I think, however, that the seta before and not that above the 

 transparent wing-rudiment, viz. s. prostigmalis, agrees with III B. 



A third possible explanation of the thoracic arrangement fol- 

 io ws liere: 



Starting from the idea that the prothoracic stigma really be- 

 longs to the praesegmental zone of the mesothorax, and that the 

 metathoracic stigma is removed to the intersegmental membrane, 

 it is easy to imagine, that the setae lying in the neighbourhood 

 have also taken part in this shifting. Further taking it for granted 

 that the setae on the thorax are originally arranged in the same 

 way as on the abdomen, we also find there s. suprastigmalis^ s. 

 prostigmalis (III B), s. i^oststlgmalis and s. Infrastlgmalis. If a 

 stigma is shifted from the oral side of a segment to the caudal 



