TRÄGÅRDH, ON DEVELOPMENT OF CLITOSTETHUS ARCUATUS. ]1 



3^"^ stages are very short, since the larva is active onh^ 

 during 3 days, secondly, that the time during which the larva 

 remains inert increazes from the P^ to the 4*^ stage, viz. 1, 

 1, 3, 4 days resp. 



From the facta gathered concerning the metamorphosis 

 it seems clear that the beetle hibernates as adult. In the end 

 of March the females, which however at that time are com- 

 paratively rare, lay egg, which develop during April and 

 become adult in the middle of May. 



At that time the adults were very common and were 

 often found in copula on Phillyrea. At the same time Aley- 

 rodes Pfdllyrea becomes adult and starts laying eggs. Con- 

 sequently it is evident that the propagation of Clitostethus 

 is closely adapted to that of Aleyrodes Phillyrea Halid. 



Textfig. 6. Leaf of Phillyrea, under surface, infested with Aleyrodes Phil- 

 lyrea Halid. Xat. size. 



How many specimens of A. phillyrea a Clitostethus requ- 

 ires for his development, I have not been able to ascertain, 

 but it is certanily a voracious insect and I generally had 

 to change its »menu» every other day and one leaf oi Phil- 

 lyrea is apt to lodge up to 150 specimens of Aleyrodes (Text- 

 fig. 6). 



The adult. 



Both the typical form, dark with double yellow luniform 

 spöt, ab. Hausmanni Credler, dark with only one luni- 

 form (the median one) spöt and var. Hegeeri Ganglb. 

 yellowish brown with one dark spöt, were abundant at 

 Portici in May. 



Allthough the adult lias been described by Hegeer (1. c. 



