THE CANADIAN ENTOMOLOGIST 153 



a large number of the flies, and about an equal number of Dacniisa 

 scaptomyzae. 



July 1st, at Hancock, Md., mined leaves of radish were col- 

 lected, from which were reared the same fly, as well as several, 

 specimens of the parasite. 



July 30th, at College Park, Md., several cabbage plants grow- 

 ing in a box, where they had been seeded for transplanting, were 

 found severely mined. Here again the same fly and man}' speci- 

 mens of the parasite were reared during the month of August. 



Dacniisa agromyz(B, n. sp. 



Female. — Length, approximately 2 mm. Head twice as broad 

 as long, smooth, with a very few scattering hairs on the occiput, 

 vertex and cheeks; the face moderately hairy, with a slight median 

 carina on the upper half; vertex not divided by a median furrow; 

 eyes bare, ovate; maxillary palpi 6-jointed, the two basal joints 

 together not as long as the third, the fourth joint as long as 1, 2 and 

 3 combined ; labial palpi 4-jointed ; mandibles with the two lateral 

 teeth acute, the median tooth longer, with a distinct notch on its 

 ventral margin near the base making the mandible appear four- 

 toothed; antennae 33-36-jointed, nearly or quite twice as long as 

 the body; the first joint of the flagellum about equal to the scape 

 and pedicle combined; following joints shorter and decreasing in 

 length toward the tip. 



Prothorax mostly concealed from above; mesonotum slightly 

 bilobed owing to a broad depression extending from base to apex 

 along the median longitudinal line, its surface anteriorly and medi- 

 ally punctate and covered with white hairs, the broad posterior 

 angles opposite the tegulte smooth and glabrous, parapsidal furrows 

 not at all impressed ; scutellar fovea deep, with several cross ridges 

 at the bottom ; mesopleurae polished and glabrous except for a fe^^ 

 hairs just above the median coxae, with a shallow, longitudinal, 

 smooth depression below the middle; metapleurae covered with a 

 dense, short, white pile, completely concealing its sculpture; pro- 

 podeumhigh and broad, abruptly truncate posteriorly, rugose and 

 covered with white pile, which is not as dense as that on the meta- 

 pleurae. St'gma linear and extending nearly two-thirds the length 

 of the radial cell ; radius arising at about the basal one-fourth of the 



