AGRICULTURAL EXPERIMENT STATION. 179 



so far as I know'has never before been reported from the United 

 States. It is regarded as a very troublesome insect abroad and its 

 introduction here is certainly unfortunate. I am at a loss to sug- 

 gest how it reached your locality, and will be pleased if you can 

 give me any help in the matter. Have you noticed it before in 

 your place ? Please ascertain whether your neighbors have noticed 

 it. Have carrots been imported to your locality, if so, from where? 

 You better watch your carrot bed this season and if the leaves of 

 the young plants turn brown, examine the young roots for the 

 brown rust spots on the surface and the interior for the maggots. 

 If you find them, then after thinning, sift sand saturated with 

 kerosene between the rows, and water heavily to pack the dirt 

 close to the roots so the flies cannot crawl down to lay their eggs. 



Respectfully, F.L.Harvey." 



We put the larvae and pupae sent by Mr. Morrell into sand in a 

 breeding cage and in about two weeks the flies began to emerge in 

 abundance and continued to come out for two weeks. We trans- 

 ferred some males and females to a jar containing parsnips, as we 

 were not able to get carrots. In a day or two we noticed the 

 females crawling between the leaves and going down to the base 

 of them and though we had not observed them mating presumed 

 they were ovipositing. The next day we broke off a leaf and found 

 the eggs near the base laid on the surface in small clusters and 

 loosely attached to the surface of the leaf. Having now eggs, 

 larvae, pupae and flies we made out the following description : 



Eggs — .6 mm. long (.024 in.) by .115 mm. broad (.0046 in.) 



§ white, oblong, about five times as long as broad, longi- 

 I tudinally marked from end to end by about 10 ridges and 

 -, | furrows which are from centre to centre .022 mm. The 

 furrows between the ridges are marked by about thirty 

 circular pits. The sculpture resembles the surface of a 

 peanut. At one end the egg abruptly narrows and bears 

 an oblong pedicil, twice as broad as long, and one- third 

 the width of the egg at the widest part, (.022 mm. x 

 .044 mm.) The pedicilate end of the egg reminds one 

 Eggjof i;siia f a t i e( j o r ain sack. See Fig. 18. 



times, (t >ri- 

 ginal.) 



Larvce — 6 mm. long, (.25 in.) breadth 1 mm., (.04 in.) leg- 

 less, white or pale yellow, semi-transparent, head end quite pointed 

 and armed with a pair of black hooks for gnawing. Aboral end 

 12 



