On the Origin of Periphyllus testudo. 93 
VII.— On the S Ones and Mobel pimeni ef ar m testudo, 
n der Hoeven. By € 
In the sixth volume (for 1863) of the * Nederlandsch Tijd- 
schrift voor Entomologie, Professor Jan van der Hoeven 
called attention to a small Hemipterous insect which frequently 
occurs on the leaves of Acer campestre and A. pseudoplatanus. 
. He named it Periphyllus testudo. 
It was observed in 1852 by J. Thornton, who gave it the 
name of Phyllophorus testudinatus, and regarded it as the pupa 
of a new species of Aphis, for whic robably a new genus 
would have to be establishedt. Subsequently (1858) Lane 
Clarke mentioned the same little animal under the name of 
* Translated from the Dutch by W. S. Dallas, F.L.S., from a separate 
impression communicated by the author, from the he Mededcelingen der Kon. 
Akad. van Wetenschappen, 2% Reeks, Deel iv 
d 
ii. Proc. p. 7 
1 ‘Objects for the Microscope, being a popular Descri tion of the most 
ei and beautiful sh for ies by L. Lane Clarke. 
ha as early as : . I cannot, however, see clearly why Van der 
Hoeven changed the sige name of testudinatus, given by Thornton to 
this animal, into mes and I believe that there is no reason for so 
:n thi 
insect 
must sink, I have thought it better to abstain from a strict appli of 
the law of priority, a a to adopt Van der Hoeven’s name in this paper, 
than to increase still further the number of pants 
