432 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io8 



The larvae form serpentine mines in the leaves of Aquilegia spp. and 

 Thalictrum spp. I have reared it from Aquilegia, cultivated variety; 

 A. truncata F. & M.; A. paucifloiu Jepson; Thalictrum, cultivated 

 variety; and T. fendleri Engelm. I have studied specimens from 

 California, Washington, Idaho, Illinois, Indiana, District of Columbia, 

 and Connecticut. 



Phytomyza nervosa Loew 



Phytomyza nervosa Loew, Berliner Ent. Zeitschr., vol. 13, p. 52, 1869 (Centuria 

 VIII, No. 99). 



The holotype female is in the Museum of Comparative Zoology 

 (No. 13432). This species, together with several other species, has a 

 yellow frons, dark scuteUum, and femora primarily yellow. The 

 third antennal segment is black, a chai'acter which separates Phy- 

 tomyza nervosa from the other species. There are no acrostichals. 

 The wing is relatively wide for its length and M1+2 has a distinct curve 

 outwardly (fig. 162). I have seen specimens from Iowa, Kansas, and 

 District of Columbia. 



Phytomyza nigra Meigen 



Phytomyza nigra Meigen, Systematische Beschreibuug der bekannten europais- 

 chen zweifliigeligen Insekten, vol. 6, p. 191, 1830. — Hendel, in Lindner, Die 

 Fliegen der palaearktischen Region, fam. 59, p. 436, 1935 (figures of head 

 and wing). 



This Holarctic species is unusual in having the eye setulose. It also 

 has a yellow frons and dark thuxl antennal segment, mesonotal mar- 

 gins, scutellum and femora. Both upper-orbital setae are of equal 

 length and strength and the acrostichals are in two rows. The larvae 

 make linear mines at the tips of leaves of Bromus tectorum L., Festuca 

 arundinacea Schreb., F. rubra var. commutata Gaud., Hordeum juba- 

 tum L., Lolium perenne L., and Triticum aestivum L. I have seen 

 specimens from Oregon and Washington reared from the grasses listed 

 here. 



Phytomyza nigrinervis Frost 



Phytomyza nigrinervis Frost, Mem. Cornell Univ. Agr. Exp. Sta., vol. 78, p. 87, 

 1924. 



The holot^'pe male is in the U. S. National Museum (No. 50028). 

 This is the darkest species among those species having a dark frons, 

 antenna, and tarsi, two equally strong upper-orbitals, and the acrosti- 

 chals in four or five rows. The head is distinctively shaped (fig. 163) 

 and is totally brown or black. The femora are not lighter colored 

 distally and the basal Aving veins are black. The entire type series is 

 from Colorado. 



