372 PROCEEDINGS OF THE NATIONAL MUSEUM vol. los 



are all proclinate. The males lack the upper-orbital setae (fig. 55). 

 The mouthparts, including the labella, are greatly elongate. 



• Tylomyza nasuta (Melander) 



Agromyza vasuta Melander, Journ. New York Ent. Soc, vol. 21, p. 260, 1913. 

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



vol. 21, p. 251, 1913 (49 9, Idaho and Washington). 

 Agromyza simplex (Loew), Melander (part), Journ. New York Ent. Soc, vol. 21, 



p. 252, 1913 (1 9 , White Plains, N. Y.). 

 Agromyza youngi Malloch, Ent. News, vol. 25, p. 312, 1914. 

 Ophiomyia madizina (Hendel), Hendel, in Lindner, Die Fliegen der palaeark- 



tischen Region, fam. 59, p. 185, 1931 (figures of head and wing). 



This is a Holarctic species that may be distinguished from the 

 Palaearctic T. pinguis by the three dorsocentral setae (the anterior is 

 about one-half the length of the posterior) and crossvein m-m being 

 less than (from one-third to three-fourths) its own length from r-m 

 (fig. 56). The head is illustrated to show the proclinate orbital 

 setulae and the absence of the upper-orbital setae in the male (fig. 55) . 

 The larvae have been reared from Taraxacum officinale Weber (==T. 

 dens-leonis) . I have seen specimens from across the northern half 

 of the United States from Washington to New York and from Ontario 

 and Quebec in Canada. 



5. Genus Phytohia Lioy 



Phytobia Lioy, Atti 1st. Veneto, ser. 3, vol. 9, p. 1313, 1864. 

 Dizygomyza Hendel, Arch. Naturg., Abt. a, vol. 84, p. 130, 1920. 



The genus Phytohia contains 52 described species, making it the 

 largest in North America. No other genus has such a diversity of 

 species, not only in regard to adult morphology but that of the larvae 

 as well. Ten subgenera have been described in an effort to system- 

 atically arrange all of the diverse groups. Giving generic status to 

 them is not accepted herein because of the annectant species found 

 throughout the genus and the over-all similarity of the male terminalia 

 (Frick, 1952). 



Two unusual species have been described from the Neotropical 

 region. The first is P. (Phytohia) kallima that has the wings marked 

 with brown (fig. 60). The other is P. {Phytohia) picta that has the 

 scutellum and sides of the mesonotum yellow (fig. 61). Such a 

 character usually places a species into Liriomyza and would do so in 

 this case except that vein R4+5 is nearer the wing tip than is M14.2 

 (fig. 60) and the midtibia bears strong setae medially. 



The similarity between Phytobia and Liriomyza also may be shown 

 by the enlarged third segment of the male antennae. Such a character- 

 istic is common to the subgenus Dizygomyza (fig. 80). One Liriomyza 

 species, commelinae, also has the third segment' enlarged (fig. 102). 



