CH. VIII.] THE DISEASES OF PLANTS. QG7 



Spotted with white, and the length of the body one 

 line and two-thirds^. 



The general experience of all the farmers and 

 gardeners with whom I have conversed upon the 

 subject, testified that the ambuiy of the turnip and 

 cabbage usually attacks these crops when grown for 

 successive years on the same soil. This is precisely 

 what might be expected; for the parent insect 

 always deposits her eggs in those situations where 

 her progeny ^^ill find their appropriate food ; and in 

 the fragments of the roots of preceding crops, some 

 of these embryo ravagers are to be expected. That 

 they never attack the plants upon a fresh site is not 

 asserted. Mr. Marshall's statement is e\'idence to 

 the contraiy; but it is advanced that the obnoxious 

 weeN-il is most frequently to be observed in soils 

 where the turnip, or cabbage, has recently and 

 repeatedly been cultivated. 



" He adds, subtus albido squamosus ; inter thoracem et elytro- 

 rum basin puncto albo pectus notatur. Thorax utrinque obsolete 

 dentatus, postice et antice fossula intermedia exaratur. Femora 

 omnia denticulata. Entomologia Brit. 282. A very full de- 

 scription of this insect is in the " Insecta Suecica Descripta" of 

 Gyllenhal, vol. iii. p. 229, under the name of Rhynchcenns sulci- 

 collis. It is the Curculio affinis of Panzer's Faunae Insectorum 

 Germanicce initia ; the Curculio sulcicollu in PaykuU's Suecica, 

 the Falciger suldcollis of De Jean's Catalogue des Cleopteres ; 

 and the Cryptorhynchus alanda of Germar's Insectorum species 

 novae, &c. 



