430 PROCEEDINGS OF THE NATIONAL MUSEUM vol. los 



the second costal section from 3 to 3.8 times as long as the fourth. 

 This is an introduced European species whose larvae make serpentine- 

 blotch mines in the leaves of Ilex aquifolium L. Now positively- 

 known from Oregon, Washington, and British Columbia. 



Phytomyza lactuca Frost 



Phytomyza lactuca Frost, Mem. Cornell Univ. Agr. Exp. Sta., vol. 78, p. 85, 1924 

 (figure of leaf mines); Canadian Ent., vol. 60, p. 77, 1928. — Needham, Frost, 

 and Tothill, Leaf-mining insects, p. 263, 1928 (figure of leaf mine). 



This species has the frons yeUow and the third antennal segment, 

 mesonotal margins, scutellum, forecoxa, and femora dark. There are 

 two equally strong upper-orbitals and two rows of acrostichals. 

 Phytomyza lactuca may be distinguished by the very long setulae 

 on the third antennal segment (fig. 156). The larvae make serpentine 

 mines in the leaves of Lactuca scariola var. integrijolia (Bogenh.) 

 G. Beck. I have seen specimens from Michigan, New York, and 

 Pennsylvania. 



Phytomyza loewii Hendel 



Phytomyza clematidis Loew (not Kaltenbach, 1859), Berliner Ent. Zeitschr., vol. 



7, p. 55, 1863 (Centuria iir. No. 100). 

 Phytomyza loewii Hendel, Konowia, vol. 2, p. 145, 1923. 

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



(1 9 , White Plains, N. Y.; 2 d' cf, Troy and Bovill, Idaho). 



This is a shining dark bro^vn species with the frons dark, the dorsal 

 upper-orbital very small, and the eye ovoid and about two-thh*ds as 

 wide as high (fig. 157). It is distinguished from Phytomyza minuscula 

 by the three setulae in the intraalar row posterior to the transverse 

 sutm'e and the inner postalar being at least one-half as long as the 

 outer. P. loewii is close to P. centralis but is different in having the 

 forefemur distally yellow and the second costal section of the \viug at 

 least twice as long as the fourth (fig. 158). The larvae make serpen- 

 tine mines in the leaves of Clematis spp. and I have reared it from 

 Clematis ligusticijolia Nutt. in Washington. I have seen specimens 

 from Washington, Idaho, Indiana, District of Columbia, and Louis- 

 iana. 



Phytomyza major Malloch 



Phytomyza major Malloch, Proc. U. S. Nat. Mus., vol. 46, p. 150, 1913. 



This is a large species (3.75 mm. in wing length) that is mostly 

 yellow with the frons and scutellum yellow. The antennae are en- 

 tirely yellow and the mesonotum has four brown vittae between the 

 rows of setae, two between the dorsocentral rows. Both known 

 specimens are teneral females from Labrador. 



