UfJURIOUf TO THK TURNIP CHOP. SStt 



Cartii, In the Oardentri' Chronicle, Feb. 22, 1845, p. 117, mentiona having^ 

 reared Phytomyza nigrieomU, a small fly, from larvee that form long 

 galleries in the substance of turnip leavex. At Dunglnss,on the immediate 

 confines of Berwickshire, I met, on the 18th of July, with a mining dipterous 

 larva on the Swedes, living in irregular bleached blotch-like spaces, out 

 of which it had dug the uaronchyma. The specimen unfortunately died, 

 but it did not agree with some other larvm known to belong to species 

 of Phytomyza. It is narrow, elongate, spindle-ehaped, much tapered in 

 front, tapered also from the middle backwards, smoothbh above, yellowish 

 white ; oral hooks and their internal apparatus well marked ; intestinal 

 canal faint ; spiracular lines not very distinct, terminating on each side 

 in front in two tubercles, surmounted by small scales, that look like ears, 

 and cause the anterior end in front to appear deltoidal ; posteriorly these 

 lines end after approximating, in two mmute stigmatic books, or rather 

 bristle shaped proeei<ses arising in a minute tubercle; two prominent 

 tubercular lobes on the margin on each side of these projections ; above 

 them the surface of the body has, as it were, been let down two steps, 

 each marked by a transverse ridge ; beneath them there is a slight slope 

 inward, with about three little granulations at its apex; segments beneath 

 slightly elevated along the incisions, granulated or sub-tuberculated. 

 Length 2i lines. 



Westwood's figure of the larva of his Piophila Apii (the Celery Stem 

 Fly), Gardeners* Chronicle, May 20, 1848, p. 332, approaches nearest to it, of 

 anything I can find, but difi'ers posteriorly. I have subsequently found 

 it both on the yellow and white turnip, and, in one instance, burrowing 

 >iDto the mid-rib of the leaf. 



