PREVENTION AND REMEDY. 223 



lives in societies of small numbers. The web is slight. The 

 eggs are large. " I have very often found it on the Plum 

 tree," on the Quince, on Petunias, &c. Piather common. 

 Length of body one millimetre and a half."* 



The following note is another description of the above 

 species {T. ruhescens) under the synonym of Tetranyclius 

 telarius of Dufour, as given by Canestrini in his work on 

 Italian Acar'inaf : — 



Tetranyclius telarius, Duf. 



"Body oval. Colour excessively variable— green, yellow, 

 rose, red ; usually there is a longitudinal central stripe along 

 the back, which is of a brighter^ colour than the rest of the 

 body. The skin is delicately striated. The whole of the back 

 is marked by four rows of rather long and slightly plumose 

 bristles, the most frontal being the sliortest. On tlie ventral 

 side the skin is similar to that of the back, and bears simple 

 bristles of moderate length and moderately numerous. The 

 feet are lighter than the rest of the body, and bear rather 

 longer bristles. Length, •■40 mm. ; breadth, '25 mm. 



"Beneath the leaves of many plants; together with the 

 adult forms, there are many eggs, in which the embryos are 

 visible in all stages of their development. Besides these are 

 hexapod larvae and octopod nymphs. It is common on almost 

 all plants, and sometimes causes much damage ; for example, 

 to Maize, Sorghum, and also to Vines. 



" This Acarus, whether on account of its variety of colour, 

 or its vast geographical distribution, being found on the most 

 different kinds of plants, also in moss and beneath stones, 

 has been described by authors under different names, which 

 are to be considered as synonymous." — (G. C.) 



The above technical descriptions are given in the hope 

 that they may be of service where differentiation of the 

 species referred to is needed ; but for all practical purposes 

 it will probably be sufQcient to consider them, and to deal 

 with them, as being what in this country we commonly know 

 as "Red Spider." 



Prevention and Eemedy of Red Sjiider attack on Plum or 

 orchard trees or in gardens. — The "Pied Spider" is most 



* ' Recherches pour servir a I'hist. des Tetranyques,' par A. L. Donnaclieu, 

 p. 152. 



t See ' Prospetto dell' Acarofauna Italiana,' per Giovanni Canestrini, Prof, 

 nella R. Universita de Padova, vol. iv. p. 433. A^jpended to the above descrip- 

 tion is a synonymical list of about sixteen different appellations. 



I " piu chiara," ? lighter or brighter. 



