AGROlSfYZID LEAF MINERS — FRICK 417 



Phytagrotnyza nitida (Malloch) 



Agromyza nitida Malloch, Ann. Ent. Soc. Amer., vol. 6, p. 288, 1913 (figures of 

 head and wing). 



A diverse species having the mouthparts elongate, Phytagromyza 

 nitida is distinct from other North American species. The head is 

 partially yellow and has the eye much higher than long, only the dorsal 

 upper-orbital reclinate, and the mouthparts elongate (fig. 131). 

 There are only two developed dorsocentral setae. No larval host 

 plants are known. I have seen specimens from Iowa, Illinois, Mary- 

 land, Virginia, and North Carolina. 



Phytagromyza orbitalis (Melander) 



Phylomyza orbitalis Melander, Journ. New York Ent. Soc, vol. 21, p. 271, 1913. 



Phytagromyza orbitalis and P. populicola lack crossvein m-m, but 

 P. orbitalis has the genovertical plates yellow in contrast to the darker 

 frontal vitta, head, and antenna (fig. 132), dark brown mesonotum, 

 pleura, and legs, and the wing tip between R4+6 and M14.2. In common 

 with P. plagiata and P. lonicerae there are about six developed dorso- 

 central setae. The larvae form blotch mines in the leaves of Symphor- 

 icarpos albus (L.), S. mollis Nutt., and S. rotundifolius Gray. I have 

 seen mined leaves on Symphoricarpos at Kamiac Butte, Wash., the 

 type locality. Thus far P. orbitalis is known from Washington, 

 Idaho, and California. 



Phytagromyza plagiata (Melander) 



Napomyza plagiala Melander, Journ. New York Ent. Soc, vol. 21, p. 273, 1913. 

 Agromyza brevicostalis Malloch, Ann. Ent. Soc. Amer., vol. 6, p. 283, 1913. 



This species, in common with Phytagromyza lonicerae, has crossvein 

 m-m present, mouthparts not elongate (fig. 133), and mesonotum 

 dull grayish pollinose with about six developed dorsocentral setae. 

 It may be distinguished by the head having the gena mostly yellow 

 and the two or three orbital setulae (fig. 133). The notopleural 

 triangle is yellow. Larval host plants are unknown and the species 

 is known from two specimens, one from Idaho and the other from 

 Montana. 



Phytagromyza populicola (Walker) 



Phytomyza populicola Haliday (MS), Walker, Insecta Britannica, Diptera, vol. 2, 



p. 247, 1853.— Hendel, Arch. Naturg., Abt. a, vol. 84, p. 154, 1920. 

 Phytomyza populicola Walker, Kaltenbach, Die Pflanzenfeinde aus der Insekten, 



p. 560, 1874. — Becker, in Becker, Bezzi, et al., Katalog palaarktischen 



Dipteren, vol. 4, p. 258, 1905. 

 Phytagromyza populicola (Haliday), Hendel, in Lindner, Die Fliegen der palaeark- 



tischen Region, fam. 59, p. 289, 1932 (figure of head). 



This species should be credited to Walker because Haliday did not 

 publish a description. Phytagromyza populicola is a small yellow 



