10 (9). Mesonotum predominantly dark, either narrowly yel- 
low or with V-shaped or rectangular patch adjoin- 
ing scutellum n 
Mesonotum with distinct bands, dark areas either 
shining black or gray, or more broadly yellow 
adjoining scutellum 13 
11 (10). Mesonotum narrowly yellow adjoining scutellum (fig. 
646) L. eupatoriella Spencer, n. sp. 
Synopsis. Head entirely yellow, including entire 
hindmargin of eye; mesopleuron with dark bar along 
lower margin; tibiae and tarsi darker, brownish 
yellow; wing length 1.75 mm, discal cell small, 
last section of vein M 3+4 3 times length of pen- 
ultimate; male genitalia with aedeagus as in 
figures 647, 648. 
Host/Early Stages. Ageratina altissima (=Eupatori- 
um rugosum ) . Larva forming long, narrow linear mine 
(fig. 649); puparium yellowish, posterior spir- 
acles each with about 8 bulbs. 
Distribution. Minnesota, Virginia, Wisconsin. 
Reference. Part 2, p. 288. 
Note. This species superficially resembles Phyto- 
liriomyza felti (fig. 989), but male terminalia 
clearly indicate the correct generic position of 
P. felti (part 2, p. 303). 
Mesonotum with V-shaped or rectangular yellow patch 
adjoining scutellum 12 
12 (11). Mesonotum with V-shaped or yellow patch adjoining 
scutellum (fig. 650) L. assimilis (Malloch) 
Synopsis. Small species, wing length in male 1.6 
mm; head, side of thorax, and scutellum lemon yel- 
low; legs largely yellow but tibiae and tarsi more 
brownish on p 2 and p 3; male genitalia with aedeagus 
as in figures 651, 652; sperm pump with large dark 
blade; surstylus elongate, with single short spine. 
Host/Early Stages. Helianthus sp. Larva forming 
linear mine (further details unrecorded). 
Distribution. Illinois, Pennsylvania; new record: 
Texas, Travis Co., Austin, 1 m. , 1 f., ex leaf 
mines on Lindheimera texana , 20. IV. 80 (S. Tavor- 
mina) . 
References. Malloch, 1918a: 80; Frick, 1959: 401. 
Mesonotum with rectangular yellow patch adjoining 
scutellum L. schmidti (Aldrich) 
Synopsis. Very small species, wing length 1.25- 
1.35 mm; frons, orbit, all antennal segments yel- 
low; mesonotum matt gray, yellow behind adjoining 
scutellum (fig. 653); legs with coxa and femora 
entirely yellow, tibiae and tarsi slightly darker, 
brownish; squama and fringe dark; male genitalia 
with aedeagus as in figures 654, 655; surstylus 
(fig. 656) with 2 stout bristles and additional 1 
at base. 
Host/Early Stages. Polyphagous, confirmed hosts in 
Florida include Albizia lebbeck , Bauhinia purpurea , 
111 
