AGROMYZID LEAF MINERS — FRICK 427 



reddish brown (fig. 146). The head is rather denuded, but the dorsal 

 upper-orbital is absent (fig. 147). The frons is wider than long. The 

 mesonotum has the setae as shown, with only about seven acrostichals 

 (fig. 146). The wing has R24.3 and R4+5 straight and very close 

 together and Mi4.2 undulating medially (fig. 148). Known from two 

 males reared from Clematis sp. in southern Texas. 



Phytomyza crassiseta Zetterstedt 



Phytomyza crassiseta Zetterstedt, Diptera Scandinaviae, vol. 14, p. 6469, 1860. — 

 Melander (part), Journ. New York Ent. Soc, vol. 21, p. 271, 1913 (299, 

 Mount Constitution, and 1 9, Chehalis, Wash.; 1 9, Collins, Idaho). — 

 Hendel, in Lindner, Die Fliegen der palaearktischen Region, fara. 59, p. 

 387, 1935 (figures of head and wing). 



Phytomyza crassiseta is a Holarctic species that has the frons yellow, 

 all three antennal segments, mesonotal margins, scutellum, and femora 

 dark, and both upper-orbitals of equal length and strength. The 

 mesofacial plate is dark and the forecoxa is distally yellow. Charac- 

 ters that separate P. crassiseta from closely related species are the 

 dark first and second antennal segments and the greatly expanded 

 arista. The larvae make serpentine mines in the leaves of Veronica 

 spp. I have seen specimens from Washington and Idaho. All are 

 females because this species is parthenogenetic. 



Phytomyza delphiniae Frost 



Phytomyza delphiniae Frost, Canadian Ent., vol. 60, p. 77, 1928. — Griswold, 

 Journ. Econ. Ent., vol. 21, p. 855, 1928. 



The holotype female is in the U. S. National Museum (No. 50024). 

 This species belongs with those species having a yellow frons, dark 

 third antennal segment, scutellum, and femora, and the mesonotum 

 laterally bordered with yellow. Phytomyza delphinii, like P. plumiseta, 

 has both upper-orbitals of equal length. From P. plumiseta, this 

 species may be distinguished by the wide gena (medially about two- 

 fifths the eye height) (fig. 149), the brown tarsi, and the mesonotum 

 dull gray pollinose. The larvae form blotch mines in the leaves of 

 Delphinium cultorum Voss. I have seen specimens from Ohio, Penn- 

 sylvania, and New York. 



Phytomyza dura Curran 



Phytomyza dura Curran, 1931, Amer. Mus. Nov., No. 492, p. 10, 1931. 



Phytomyza dura has a yellow frons, dark third antennal segment, 

 mesonotal margins, scutellum, forecoxa, and femora. The upper- 

 orbitals are of equal length (fig. 150) and there are two rows of 

 acrostichals. From P. atripalpis this species can be distinguished by 

 its smaller gena (medially .30 of the eye height) (fig. 150) and by 



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