420 PROCEEDINGS OF THE NATIONAL MUSEUM vol. los 



the genovertical plates not extending beyond the eye margin (fig. 137). 

 Crossvein m-m is beyond r-m. The larvae mine the leaves of 

 Ranunculus spp. I have seen specimens from Missouri, Indiana, 

 Michigan, Wisconsin, and from Ontario. 



Napomyza lateralis (Fallen) 



Phytomyza lateralis Fallen, Diptera sueciac, vol. 2, No. 41 (Phj^tornvzides), 



p. 3, 1823. 

 Napomyza lateralis (Fallen), Hendel, in Lindner, Die Fliegen der palaearktischen 



Region, fam. 59, p. 315, 1932 (figures of head and wing). 



Napomyza lateralis is a Holarctic species that has two rows of 

 acrostichal setae which separate it from N. davisii. From N. 

 parvicella, N. lateralis may be distinguished by the maxillary palpus 

 not being broadened distally and vein M1+2 being at the wing tip. 

 In Em'ope the larvae mine in the receptacles and the pith of stems of 

 many annual plants. In North America, this species was reared 

 from Achillea millefolium var. lanulosa Piper in California. I have 

 seen specimens from California, Oregon, Colorado, and Alaska. 



Napomyza parvicella (Coqiiillctt) 



Agroniyza parvicella Coquillett, Journ. New York Ent. Soe., vol. 10, p. 189, 1902. — 

 Malloch, Ann. Ent. Soc. Amer., vol. 6, p. 287, 1913 (figures of head and wing). 



Napomyza parvicella differs from A^. davisii in having only two rows 

 of acrostichals and the genovertical plates extending beyond the eye 

 margin (fig. 138). The maxillary palpus is broadened and the 

 wing tip is between veins K4+5 and M1+2, characters which serve to 

 separate N. parvicella from A'^. lateralis. The eye is setulose. Known 

 from one female from Alaska. 



15. Genus Phytomyza Fallen 



Phytomyza Fallen, Specimen entomologicum novam Diptera disponendi metliodum 

 exhibens, p. 21 (No. 67), 1810 (figure of wing). 



The most specialized North American genus, Phytomyza has the 

 orbital setulae proclinate (fig. 139), crossvein m-m absent, and Mj+o 

 the weakest vein (fig. 145). Napomyza is the only closely related 

 genus and is separated by having crossvein m-m present. 



There are only 39 described Phytomyza species in North America as 

 compared to the* 20lUisted for the Palaearctic region in 1936 by 

 Hendel. SinceTthatftime'^many more European species have been 

 described. The North American species are rather evenly distributed 

 throughout the genus as divided in Hendel's key. The first species 

 to be separated out by the use of that key to Palaearctic species is P. 

 trivittata (couplet 7), while the last is P. loevni, which keys out at the 

 last couplet (No. 236). 



