384 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io8 



4. Legs with all femora distally light yellow for a distance subequal to the femoral 



diameter 5 



Legs with forefemur distally light yellow, others black luctuosa 



5. Abdomen with basal two or three tergites laterally yellow morosa 



Abdomen with basal two or three tergites laterally black . . . magnicornis 



Phytobia {Dizygomyza) iraeos (Robineau-Desvoidy) 



Agromyza iraeos Robineau-Desvoidy, Rev. Mag. Zool., ser. 2, vol. 3, p. 393, 



1851. 

 Dizygomyza {Dizygomyza) iraeos (Robineau-Desvoidy), Hendel, Die Fliegen der 



palaearktischen Region, fam. 59, p. 86, 1931 (figures of larval spiracles), 

 Agromyza taeniola (Coquillett), Melander (part), Journ. New York Ent. Soc, 



vol. 21, p. 256, 1913 (1 ? , Douglas, Alaska). 



This species is very similar to Phytobia (Dizygomyza) iridis, another 

 Holarctic species, but may be separated by the three hght yellow 

 "knees." The key characters of romided head, dark tarsi, and small 

 size serve to separate this species from P. (D.) thompsoni. The 

 larvae mine in Iris spp. There are reared specimens from Indiana 

 and Louisiana; other specimens that I have seen are from Michigan 

 and Alaska. 



Phytobia (Dizygomyza) iridis (Hendel) 



Dizygomyza iridis Hendel, Zool. Anz., vol. 69, p. 253, 1927. 



This Holarctic species is very similar to Phytobia (Dizygomyza) 

 iraeos but is distinguished by having only the forefemur light yellow 

 distally, the others being light brown. The larvae mine in Iris spp. 

 I have identified specimens from California and Michigan. 



Phytobia {Dizygomyza) luctuosa (Meigen) 



Agromyza luctuosa Meigen, Systematische Beschreibung der bekannten euro- 



paischen zweiflligeligen Insekten, vol. 6, p. 182, 1830. 

 Dizygomyza (Dizygomyza) luctuosa (Meigen), Hendel, in Lindner, Die Fliegen der 



palaearktischen Region, fam. 59, p. 88, 1931 (figures of head, wing, and 



puparial spiracles). 

 Agromyza taeniola (Coquillett), Melander (part), Journ. New York Ent. Soc, 



vol. 21, p. 256, 1913 (2? 9, Portland, Oreg., and Monroe, Wash.). 



A rather distinctive species among the species having relatively 

 sparse acrostichals in that the midfemora and hind femora are all 

 black. No reared specimens are known from North America, but the 

 larvae mine species of Carex and Juncus in Europe. At present this 

 species is known from California, Oregon, Washington, and New York, 

 in the United States, and from Nova Scotia in Canada. 



Phytobia (Dizygomyza) magnicornis (Loew) 



Agromyza magnicornis Loew, Berliner Ent. Zeitschr., vol. 13, p. 46, 1869 (Cen- 

 turia VIII, No. 86). 

 This is a Ncarctic species that may be separated from the closely 

 related Phytobia (Dizygomyza) morosa in having the abdominal ter- 



