428 PROCEEDINGS OF THE NATIONAL AIUSEUM vol. io8 



having only about 9 acrostichals and vein M1+2 straight (fig. 151). 



1 have seen 16 swept specimens from Quebec. 



Phytomyza flavicornia Fallen 



Phytomyza fiavicornis Fallen, Diptera sueciae, vol. 2, No. 41 (Phytomyzides), p. 4, 

 1823. — Hendel, in Lindner, Die Fliegen der palaearktischen Region, fam. 59, 

 p. 402, 1935 (figures of head and wing). 



This is a moderately large Holarctic species (2.3 to 2.6 mm. in wing 

 length) that has yellow frons, dark scutellum, and femora mostly 

 yellow, Phytomyza fiavicornis is distinct from related species by 

 having one upper-orbital and the mesonotum shining black. P. 

 rufijpes and P. genalis have the mesonotum gray pollinose and P. 

 nervosa has the thu-d antennal black. The species has not been 

 reared in North America but the larvae mine the pith of stems of 

 Urtica dioica L. in Europe. I have seen specimens from Indiana and 

 Michigan. 



Phytomyza flavinervis Frost 



Phytomyza flavinervis Frost, Mem. Cornell Univ. Agr. Exp. Sta., vol. 78, p. 85, 

 1924. 



The holotype female is in the U. S. National Museum (No. 50022). 

 This is a large species (3 mm. in wing length) that has the frons yellow, 

 scutellum and femora dark, and the third antennal segment yellow. 

 Phytomyza flavinervis may be separated from P. auricornis by the bare 

 third antennal segment (fig. 152) and the more setulose (4 to 6 vs. 



2 to 3) intraalar row posterior to the transverse suture. The two 

 specimens of the type series are all that are know^n. They are from 

 Texas. 



Phytomyza genalis Melander 



Phytomyza genalis Melander, Journ. New York Ent. Soc, vol. 21, p. 272, 1913. 

 A large species (2.75 to 3.25 mm. in wing length) that has the frons 

 yellow, scutellum dark, and the femora mostly yellow. The third 

 antennal segment is yellow and the mesonotum is gray pollinose. 

 The head has the gena extremely wide and the genovertical plates 

 greatly extending beyond the eye margin (fig. 153). From Phyto- 

 myza rufipes, P. genalis may be separated by its anepisternum being 

 more than one-half j^ellow and with a ventral brown triangle. I have 

 seen specimens only from Illinois. 



Phytomyza gregaria Frick 



Phytomyza nigritella (Zetterstedt), Melander, Journ. New York Ent. Soc, vol. 



21, p. 270, 1913. 

 Phytomyza obscurella (Fallen), Melander (part), Journ. New York Ent. Soc, 



vol. 21, p. 270, 1913 (excluding 1?, Bellingham, Wash.). 

 Phytomyza gregaria Frick, Ann. Ent. Soc. Amer., vol. 47, p. 371, 1954 (figure of 



leaf mines). • 



