75 
NOTES ON DIPTEROUS LEAF-MINERS ON CABBAGE. 
The leaves of cabbage, radish, and other cruciferous plants are 
liable to injury from the attack of maggots of the families Drosophil- 
ida3 and Oscinidse. Three species have been identified with such 
attacks in this country, and a fourth can now be added. It seems 
probable if the leaves of cruciferous crops in various portions of the 
country were carefully examined, we might find that several more 
species have this habit. They are not of themselves particularly 
destructive, but they contribute their share toward the injury of these 
plants, different species of cabbage worms being the principal enemies, 
except in regions where such other pests as the harlequin cabbage 
bug and the cabbage plant-louse are most numerous. 
The Imported Turnip Leaf-miner {Scaptomyza flaveola Meig.). — This 
appears to be the most abundant species, and has received attention 
by Mr. D. W. Coquillett in an article in Insect Life (Vol. VII, 1895, 
Fig. 17 .—Scaptomyza flaveola: a, larva; b, puparium; c, adult; d, antenna of fly; e, work in radish leaf— 
e natural size; all others enlarged (reengraved after Coquillett). 
pp. 381-383). Since that publication was issued the writer reared 
the same species from the leaves of cabbage in the District of Colum- 
bia, the adult issuing June 7, 1900. October I of the following year 
the same species was obtained from cabbage at Tennallytown, D. C. 
It was noticed that the mature flies were quite sluggish in the cool 
temperature which prevailed at that time. Being interested in this 
group of insects, the writer obtained from Prof. H. Carman, of the 
State agricultural experiment station at Lexington, Ky., a specimen 
of the species which he described and figured on pages 46-51 of" 
Bulletin No. 10 of that station as Drosophila sp. This was pro- 
nounced by Mr. Coquillett to be the same as that figured in Insect 
Life, and mentioned under the name of Drosophila flaveola. It is 
illustrated herewith (tig. 17). Mr. Coquillett has since adopted the 
generic name of Scaptomyza. A short notice is given of this species 
