359 



Hiporrita {EucheUa) jacobaea Linn. 



Material 1915 (the Hagiie) and coU. Kall. Plate XIII, fig. 7. 



The specimens collected by me in the middle of April measured 

 10 mm. I did not succeed in culti vating them, therefore I do not 

 know to which instar they belonged. The arrangement of the 

 setae of these specimens is the same as of those of coll. Kall. 

 The full-grown specimens are 35 mm. 



Prothorax. S. dorsaUs, s. suhdorsalis, s. prostigmalh^ two .s\ Ixmdeü 

 on one tuberculum, s. propedalis^ s. posfpedaUs. 



Mesofhora.r and Metafhorax. S. dorsaJis^ s. dorsoJaferaHs^ s. siipra- 

 sfu/niaJis, s. prostigmalis and on the place of the wing-rudiment 

 one seta. One might be tempted to look for the rudimentary 

 stigma on this spot, as in this place the air-tubes arise from the 

 main tracliea. Two s. hasales^ s. propedalis, s. postpcdalis. 



Abdomen 1, 2. S. dorsalis, s. subdorsalis^ s. snprastigiiKdis, 

 s. postsfigmaUs, s. infrastigmalis^ two s. hascdes on one tuber- 

 culum, s. pedalis. 



Segiii. 3, 4, 5, 6=1, but instead of s. pedalis there is a seta 

 on the front side of the leg = s. propedalis. 



„7,8,9 = 1. 



„ 10 = 1, but somewhat reduced, for s. poststigmalis and 

 s. infrastigmalis are absent. On the anal legs three setae. 



Fupa. Coll. Kall. no setae. 



Arctia caja Linn. Plate XIII, fig. 4, 5 a, b. 



Material on alcohol. Groningen 1914. 



Instar I. Length 6 — 7 mm. The head is black, the tubercula 

 are brown, they soon begin to colour. The tubercula are warts, 

 the setae are plumed. 



Prothorax. There is no prothoracic shield, but the two v. dorsales 

 of the left and right sides approach one another and they have 

 progressed a great deal over the segment in ventral direction. V. sub- 

 dorsalls is very small. V. sHprastigmalis is large and situated 

 a little lower than usually is tlie case in other families of cater- 



