108 First Report on Economic Zoology. 
bulb as you describe. Those I have kept attacked as many as ten 
bulbs before becoming mature. When one bulb is destroyed they 
crawl through the soil and enter the next one at its base. The grubs 
seem to reach maturity during November, but some kept under 
observation lived until January. When full fed they form a cell in 
the earth near the last bulb attacked and line this cell with silk, 
forming a perceptible cocoon. The puparium is dark brown, oval in 
form, and has two projecting processes in front. 
It is probable that this pest is constantly being imported from 
the Continent. 
It is very desirable to lift all bulbs in a bed that is invaded 
before October ends, even if it is not the year for their removal. All 
bulbs should be examined and any showing decay destroyed, or the 
fly will go on increasing and may do endless harm. Where beds 
have been invaded and the bulbs lifted, the ground should be deeply 
dug and the top spit buried so as to prevent the flies emerging next 
year. Mr. Leney informs me that on lifting the bulbs to have 
them examined and to kill the larvae no more than two full-grown 
larvae occurred in each bulb, but more frequently only one in a bulb ; 
when, however, the larvae are in a younger stage and about half the 
size of those sent (fully mature) he invariably found from seven to 
eight in a single bulb. 
The Marguerite Fly and its Destruction. 
Specimens of Marguerite leaves tunnelled and generally damaged 
were received from Great Staughton, near St. Neots, on the 4th of 
June. The following reply was sent in answer to a request for 
information in regard to destroying the culprits : — 
The white daisies that are attacked are being tunnelled by the little 
grubs of a small fly, the Marguerite Fly (. Napomyza lateralis , Fall.). The 
only thing one can do is to pick off all the diseased leaves, and if they 
are very bad destroy (bum) the whole plant. There is no remedy, and if 
left alone they go on spreading very rapidly. When the plants are young 
spraying with paraffin emulsion will keep the fly away, but when it has 
once laid its eggs on the leaf you can do nothing for it. 
The Carrot Fly ( Psila rosce , Fabr.) and Aphides 
on Carrots. 
The Carrot Fly ( Psila rosce) was very destructive during the 
summer of 1902. One correspondent, Mr. Hammond, writing from 
Canterbury, states as follows: “I have since looked at my neigh- 
