Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 254. 
3 (1). Mesonotum at least partially yellow adjoining 
scute Hum (figs. 632, 650) 4 
Mesonotum dark to margin of scutellum 17 
4 (3). 3 d antennal segment angulate (fig. 629) 
L. angulicornis (Mai loch) 
Synopsis. Small species with frons and 3d anten- 
nal segment yellow; mesonotum black, largely 
matt, with V-shaped area yellow adjoining scutel- 
lum; male genitalia with aedeagus as in figures 
630, 631. 
Host/Early Stages. Triglochin maritimum and T. 
palustre . Larva forming narrow linear mine that 
runs round filiform leaves and can penetrate 
deeper into parenchyma; puparium reddish, re- 
maining in leaf, posterior spiracles each with 3 
rather large bulbs. 
Distribution. Illinois; Canada, widespread in 
Europe (as L. triglochinae Hendel). 
References. Frick, 1959: 401 and fig. 96 (3d 
antennal segment); Spencer, 1969a: 166. 
- 3d antennal segment rounded 5 
5 (4). 3d antennal segment infuscated distally 
L. variata (Mai loch) 
Synopsis. Frons lemon yellow, 2 ors, 3 ori, orbit 
darkened on upper half; gena pale yellow, at 
broadest point less than 0.25 height of eye; 3 d 
antennal segment yellow below, distinctly 
darkened above (see Frick, 1959: fig. 126); meso- 
notum matt blackish gray (fig. 632), broadly yel- 
low adjoining scutellum; legs with femora bright 
yellow, tibiae and tarsi cons trastingly black; 
wing length 2.3 mm (not 1.5 as stated by Malloch, 
1913a: 277); male genitalia unknown. 
Host/Early Stages. Unknown. 
Distribution. Maine. 
References. Malloch, 1913a: 277; Frick, 1959: 411. 
Note. The unique holotype is now in poor condi- 
tion and lacks its head. 
- 3d antennal segment yellow 6 
6 (5). Frons strongly projecting above eye (fig. 635) 7 
Frons not or at most slightly projecting above eye 8 
7 ( 6 ). Squama 1 fringe yellow L. f lavonigra (Coquillett) 
Synopsis. Head largely yellow, apart from short 
area along hindmargin of eye; frons distinctly 
projecting above eye, 2 ors, 3 ori; gena broad, 
almost half height of eye, parafacial prominent; 
mesonotum grayish black broadly yellow adjoining 
scutellum, dark area divided into bands in type 
specimens from New Mexico (Malloch, 1913a), more 
solid in specimens from Utah; legs with femora 
largely yellow but with variable brown markings, 
tibiae and tarsi brown; squama and fringe yellow; 
wing length 2.3 mm in males from Utah, 2.5- 
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