414 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io8 



similar throughout the genus and is much like that of Xyraeomyia 

 conjunctimontis (fig. 130). Phytoliriomyza may be separated from 

 Xyraeomyia by the fully developed axillary lobe and calypter and the 

 presence of acrostichal setae and crossvein m-m. 



Phytoliriomyza is a small but widely distributed genus. There are 

 three species from North America, two from Europe, and one each 

 from extreme southern South America, Formosa, and Hawaii. Frick 

 (1953b) gave a key to the species of the world known at that time. 

 Since then the correct status of P. arctica (Lundbeck), P. immacvlata 

 (Coquillett), and P. imperfecta (Malloch) has been determined. 



Key to the described species of Phytoliriomyza 



1. Eye bare; anepisternum mostly yellow with a ventral dark area 2 



Eye setulose; anepisternum gray, dorsally narrowly yellow arctica 



2. Vein M344 with ultimate section about 1.5 times as long as penultimate section; 



abdominal tergites gray in lateral view immaculata 



Vein M3+4 with ultimate section about twice as long as penultimate section; 

 abdominal tergites yellow in lateral view perpusilla 



Phytoliriomyza arctica (Lundbeck) 



Agromyza arctica Lundbeck, Vidensk. Medd. Naturh. For. Kj0benhavn, vol. 5, 



p. 304, 1900 (figure of wing). 

 Phytoliriomyza arctica (Lundbeck), Shewell, Canadian Ent., vol. 85, p. 469, 1953. 



This species is unique among North American species of Phytolirio- 

 myza in having the eye setulose and the anepisternum mostly dark 

 gray. P. montana Frick of Hawaii is the most similar species but has 

 the maxillary palpi black while they are yellow in P. arctica. No 

 larval host plants are known. Lundbeck notes that the species is 

 found especially in willow thickets along the west coast of Greenland 

 as far north as latitude 69°. The types are from Greenland and I 

 have seen two specimens from Yale and Bear Lake, British Columbia. 



Phytoliriomyza immaculata (Coquillett) 



Odinia immaculata Coquillett, Journ. New York Ent. Soc, vol. 10, p. 185, 1902. 

 Agromyza immaculata (Coquillett), Malloch, Ann. Ent. Soc. Amer., vol. 6, p. 289, 



1913 (figure of wing). 

 Agromyza ■perpusilla (Meigen), Melander, Journ. New York Ent. Soc, vol. 21, 



p. 257, 1913. 



The holotype of Phytoliriomyza immaculata is teneral and therefore 

 easily confused with the more yellowish P. perpusilla. The abdominal 

 tergites of P. immaculata are dark when viewed laterally as contrasted 

 with the laterally yellow tergites of P. perpusilla. Also, the ultimate 

 section of M3+4 is shorter (1:1.5 vs. 1:2) in P. immaculata. This 

 species is widespread and I have seen specimens from California, 

 Washington, Idaho, New Mexico, South Dakota, Minnesota, Kansas, 



