AGROMYZID LEAP MINERS — FRICK 377 



mine the cambiiim*of Acer ruhrum L. I'have^: seen specimens from 

 Iowa, Indiana, Michigan, Virginia, District of Columbia, Maryland, 

 New York, Massachusetts, and Quebec. 



Phytobia {Phytobia) tca/toni (Malloch) 



Agromyza waltoni Malloch, Abd. Ent. Soc. Amer., vol. 6, p. 303, 1913 (figures of 

 head and wing). 



This species differs from P. amelanchieris and P. setosa in having a 

 brown antenna, crossvein m-m not more than six-tenths of its length 

 from r-m, and the lack of medial posterolateral setae on the midtibia. 

 It was originally described from a female from northern New York. 

 There is a male from Tennessee in the Iowa State College collection. 



5b. Subgenus Nemorimyza Frey 



Nemorimyza Frey, Notulae Ent., vol. 26, p. 42, 1946. 



This subgenus was erected for a single species having the characters 

 of Phytobia except that the presutural dorsocentral is absent. Such a 

 separation is justified because the larva is a leaf miner of the usual 

 type and is up to 5 mm. long when full grown. There are three 

 short bulbs on each posterior spir9,cle. 



Phytobia (Nemorimyza) posticata (Meigen) 



Agromyza posticata Meigen, Systematische Beschreibung der bekannten 



europaischen zweifliigeligen Insekten, vol. 6, p. 172, 1830. — Frost, Mem. 



Cornell Univ. Agr. Exp. Sta., vol. 78, p. 50, 1924 (figure of leaf mine). 

 Dizygomyza (Dendromyza) posticata (Meigen), Hendel, in Lindner, Die Fliegen 



der palaearktischen Region, fam. 59, p. 30, 1931 (figure of head and wing). 

 Agromyza terminalis Coquillett, Proc. Acad. Nat. Sci. Philadelphia, vol. 47, 



p. 318, 1895. 

 Agromyza taeniola Coquillett, Proc. Ent. Soc. Washington, vol. 6, p. 191, 1904. 

 Agromyza parvicornis (Loew), Melander (part), Journ. New York Ent. Soc, 



vol. 21, p. 254, 1913 (1 9 , Wisconsin). 

 This species is shining black and has the lunule white tomentose, 

 only three postsutural dorsocentrals, setae medially on the midtibia, 

 vein R4+5 nearest the wing tip, and the male abdomen primarily 

 yellow. It is a very common and widespread Holarctic species. The 

 larvae form blotch mines in the leaves of species of Solidago and Aster. 

 There are specimens from States in all parts of the country and it may 

 be considered as occurring throughout the United States. I have 

 seen specimens from Ontario and Quebec in Canada. 



5c. Subgenus Amauromyza Hendel 



Amauromyza Hendel, in Lindner, Die Fliegen der palaearktischen Region, fam. 59, 

 p. 59, 1931. 

 This is a small subgenus that has six European species (Hendel, 

 1931) and two North American species. The halter is totally or 



