TRÄGÅRDH, ON DEVELOPMENT OF CLITOSTETHUS ARCUATUS. 9 



metathorax and of the subterminal glandular hairs of the 

 abdominal pleural processes. 



Fiirthermore the median dorsal tubercles have grown 

 darker. 



The 4^^' stage does not differ from the 3^^ one except by 

 its greater size and by the dorsal tubercles becoming darker. 



Textfig. 5. Pupa, dorsal view. 



The pu^m (Textfig. 5). 



In the cases when I observered how the larva made 

 ready for piipatidn, it always left the leaf and attached itself 

 to the walls of the glass tiibe. From what we know about 

 the behaviour of other Scymnidae, which all attach themselves 

 to the under surface of leaves, it is probable that the dif- 

 ference in this respect in C. arcuatus was due to the con- 

 finement, in which it was hold. 



The larva remained inert during 4 days, af ter which the 

 larval skin split and shriveled to a wrinkled mäss round 

 the top of the abdomen. 



The pupa is at first white but darkens låter. There are 

 a pair of dark, irregular and transverse spöts on the dorsal side 

 of the 3—5*^ abdominal segment, near the median line; and the 

 tips of the alse are blackish. The pupa is richly provided with 

 dark spines and hairs. On the prothorax there are in all 9 

 pairs of which 2, placed at the anterior margins, and 4 pairs, 

 at the lateral angles, are as long as V2 the width of the 



