52 A MANUAL OF 



bling the common house-fly, but somewhat 

 smaller in size, measuring 0.20 in length to 

 the end of its body and 0.26 to the tip of 



the closed wings This cabbage 



fly is so closely related to the onion fly, that 

 the same remarks made respecting the reme- 

 dies for that species .will apply equally well to 

 this." In speaking of the striped flea-beetle, in 

 the same Report, he describes certain " crooked 

 marks" to be seen upon the leaves of cabbage 

 and turnip plants, and says : " These marks are 

 really produced by minute worms living in the 

 interior of the leaves, feeding upon their green 

 pulpy substance, and leaving the skin unbro- 

 ken, mining a serpentine track, which increases 

 in thickness as the worm grows to a larger 

 size. These worms are the larvae of the flea- 

 beetles, which make most of these marks, 

 which occur in the turnip and other leaves 

 in the garden." 



It is but justice to state that this fallacy 

 for we have proved it to be such did not 

 originate with Mr. Fitch, but is credited as 

 being a new and valuable discovery, made by a 

 Mr. Le Keux, a member of the Entomological 

 Society of London. But Mr. Fitch heartily 

 endorses it, and so it has been handed down 



