ARKIV FÖR ZOOLOGI. 



BAND 5. N:o 12. 



Oii tlie biologj and development of CUtostethKs 

 arcuatus (Rossi), an eiiemy of tlie Alejrodid*, 



By 

 IVAR TRÄGÅRDH D. se. 



Upsala. 



With 1 Plate and 7 Textfigures. 

 Communicated April 14th by Chr. Aurivillius and Y. Sjöstedt. 



While studying the Aleyrodidse last year at the Entomo- 

 logica] Laboratory of the R. Scuola Superiore d'Agricoltura 

 in Portici I had an opportunity of studying the biology 

 of Clitostethus arcuatus Rossi and was able to follow the 

 development from egg to adult; this I intend to describe 

 on the following pages. 



It is true that two authors, Rey^ and Hegeer-, pretend 

 to iiave discovered the larva of this beetle. But as to Rey,^ 

 his only reason for referring the larva he describes to CL 

 arcuatus is, that he foiind both on the same tree, a hawthorn, 

 a fact which to most entomologists would not appear to be 

 a conclusive proof on that point. And, as a matter of fact, the 

 larva described by Rey is not the. larva of Cl. arcuatus, that 

 is obvious from his statements of antennae with several joints, 

 (how many he does not tell us!) of the colour etc. 



As to Hegeer's"- description, which is accompanied by 

 figures, it conveys, at the first glance, the impression that it 

 is quite authentic, and it has as a matter of fact induced 

 Clément to the following eulogy, in which he holds it out 



^ Annales de la Société Linnéenne de Lyon. T. 2S. 1881. p. 131 — 133. 

 - Sitzungsberichte d. Kais. Akademie d. Wissenschaft. Matem.-Xa- 

 turw. Classe. T. 24. 1857. p. 326—330. Taf. 5- 



Arkiv för zoologi. Band 5. N:o 12. 1 



