382 PROCEEDINGS OF THE NATIONAL MUSEUM vol. los 



Agromyza coquilletti Malloch, Ann. Ent. Soc. Amer., vol. 6, p. 295, 1913 (figure 



of head). 

 Agromyza marginata (Loew), Melander, Journ. New York Ent. Soc, vol. 21, p. 



256, 1913. 



Paratype males of Phytobia coquilletti were compared with two 

 males lent by E. M. Hering. The distinctive keel on the ninth tergite 

 (figs. 74, 75), first described by Shewell (1953), is also present on the 

 European males. Malloch 's figure of the head is somewhat inaccurate 

 and I have redrawn it (fig. 76). This species is quite yellow with 

 most of the head, most of the humerus, notopleural triangle, all femora 

 dis tally, and all tergites posteriorly being yellowish. The larvae 

 mine the leaves of many species of grass and there are North American 

 records from the following: Avena sativa L., Elymus canadensis L., 

 Hordeum juhatum L., Triticum aestivum L., and Zea mays L. I 

 have seen specimens from many of the States in the northern half 

 of the United States and from Manitoba in Canada. 



Phytobia (Poemyzd) muscina (Meigen) 



Agromyza muscina Meigen, Systematische Beschreibung der bekannten euro- 



paischen zweifliigeligen Insekten, vol. 6, p. 177, 1830. 

 Dizygomyza (Poemyza) muscina (Meigen), Hendel, in Lindner, Die Fliegen der 



palaearktischen Region, fam. 59, p. 44, 1931 (figures of head and wing). 

 Agromyza marginata Loew, Berliner Ent. Zeitschr., vol. 13, p. 49, 1869 (Centuria 



viii, No. 91). 

 Agromyza superciliosa (Zetterstedt), Melander, Journ. New York Ent. Soc, 



vol. 21, p. 256, 1913. 



Phytobia muscina is a distinctive species because the femora are 

 distally yellow for about one-third of their length. The genovertical 

 plates are yellowish on the dorsal half and usually are brownish for 

 the full length, contrasting with the black frontal vitta. The larvae 

 mine the leaves of several species of grass. The only reared specimens 

 that I have seen from North America were from leaf mines on Agro- 

 pyron repens (L.), Ehrharta erecta Lam., and Hordeum murinum L. 

 I have seen specimens from California (including Los Angeles), Ore- 

 gon, Washington, Idaho, Illinois, Indiana, Michigan, District of 

 Columbia, Maryland, Pennsylvania, New York, and Massachusetts. 

 The species also occurs in the North West Territories of Canada. 



Phytobia (Poemysa) subangulata (Malloch) 



Agromyza subangulata Malloch, Psyche, vol. 23, p. 51, 1916. 



This species is similar to Phytobia angulata in having the prescutellar 

 seta developed. However, it differs in having only the forefemur 

 distaUy yellow, the other femora distally reddish brown, crossvein 

 r-m definitely distad of center of cell I-M2 and sHghtly beyond the 

 junction of Ri in the costa (fig. 77). There is a narrow but rather 



