110 
On the Ravages of the Turnip Fly. 
nemorum), found upon all these last plants, but in 
greatest abundance at night. 
1834. Experiment 6. 
July 24th. Placed some of the beetles, found upon the plants of 
Exp. 5, under glasses upon plants, growing in small 
phials, in common soil. 
July 25th. Plants of Nos. 3, 4, 5, and 7, of Exp. 4, unprotected, 
not touched at present. No other beetle seen upon 
the plants of No. 6, in Exp. 1, the solitary speci- 
men having been removed when first seen. 
28th. Thinned the plants of Exp. 1. None eaten, and no 
appearance of beetles. 
Thinned, also, the unprotected plants (Expts. 2 and 3) 
in the open ground : many eaten. 
Aug. 7th. Thinned the plants of Exp. 1 a second time: none 
eaten. Thinned, also, the plants of Expts. 2 and 
3 : many eaten. Nos. 3, 4, 5, and 7, (Exp. 4), not 
touched : no fly visible. 
8th. Plants of Exp. 5 thinned, and transplanted ; numbers 
of beetles upon them, and much eaten : sixty were 
found upon one row. 
Sept. 24th. Some beetles (//. oleracea ) found feeding upon turnips: 
three enclosed in a box. A very large beetle of this 
kind found. 
25th. Haltica nemorum seen. Turnip plants very little eaten 
after this time. 
Oct. 31st. A specimen of H. nemorum seen. 
1835. 
Mar. 28th. Repeated Exp. 5. 
April 7th. Seeds of Nos. 4, 5, 6, and 7, coming up. 
9th. Beetles of H. nemorum , and H. oleracea, feeding upon 
the young plants. 
10th. Seeds of Nos. 1 and 3 coming up. 
20th. Many beetles feeding. Sowed mustard, cabbage, and 
radish seed. 
22d. Sowed fresh seeds of all the varieties of turnip enu- 
merated above. Many beetles feeding on the first 
sown plants. 
28th. Beetles found upon all the young plants of turnip, 
cabbage, radish, and mustard. 
These insects may be found upon the first sown plants of mus- 
