152 THE CANADIAN ENTOMOLOGIST 



x^bdomen subsessile, as long as the thorax, ovate, squarely cut 

 off at the apex, the apical segments retracted ; first segment rugose, 

 broader at the apex, than at the base, as long as the posterior coxa?, 

 its spiracles about midway of the segment and prominent, basally 

 the segment is bicarinate, the carinae originating at the lateral 

 and angles and meeting before the spiracles, back of the triangular 

 area enclosed by the carina?, the surface is convex, the posterior 

 lateral angles depressed; segments beyond the first smooth and 

 polished; ovipositor sheath about one-fourth the length of the 

 abdomen. 



Colour. — Shining black; palpi, labrum, scape and legs, including 

 the coxae, testaceous; mandibles slightly darker; flagellum brown- 

 black, the basal oints paler; first segment of the abdomen black, 

 the following dorsal segments very dark brown, the second seg- 

 ment often somewhat testaceous on the disk. Wing veins and 

 stigma brownish testaceous. 



Male. — Like the female in every respect, except that the an- 

 tennae are 24-25-jointed; the stigma is broader than the length of 

 the first abscissa of radius, considerably broader than in the female; 

 the abdomen is slightly longer than the thorax and attains its 

 greatest width just before the apex, therefore not ovate, but spatu- 

 late. 



Type locality. — College Park, Md. 



Host. — Scaptomyza flaveola Meig. 



Type Cat. No. 15596, U. S. National Museum. Paratypes 

 in the United States National Museum and the Collection of the 

 Maryland Agricultural Experiment Station. 



During the season of 1912 the dipterous leaf miner Scap'.omyza 

 flaveola Meig. was collected by the writer in three different localities 

 and on as many different dates. June 3rd, at Hyatts\ille, Md., it 

 was found infesting the leaves of turnips in a small garden plot. 

 Both larvae and puparia were present in large numbers. The pu- 

 paria were found either in the original larval mines or beneath 

 wilted and fallen leaves on the ground. The majority seemed to 

 have pupated in the leaves, and none seemed to ha\e entered the 

 soil to transform. Many leaves were collected and taken to the 

 laboratory, and from these were reared during the month of June 



