(Mesopleuron normally paler, see couplet 63.) 
57 (55). Femora entirely yellow or at most narrowly black 
basally; mesonotum shining L. sabaziae Spencer 
Synopsis. Frons, orbit, and antenna yellow; hind- 
margin of eye black, with both vt on black ground; 
3d antennal segment with slight but not conspicu- 
ously long pubescence; mesonotum shining black, 
yellow patches at hindcorners small, acr in 4 
rows; mesopleuron solidly black on lower 0.75 
(fig. 760); legs with femora yellow, at most nar- 
rowly black basally, tibiae and tarsi brownish 
black; wing length 1.75-2 mm; male genitalia with 
aedeagus as in figures 761, 762; surstylus with 2 
strong bristles. 
Host/Early Stages. Asteraceae, recorded on Baccha- 
ris , Carduus , Cirsium , Dahlia , Gnaphalium , and 
Silybum (in California). Larva forming irregular 
linear mine (fig. 763), not infrequently associ- 
ated with midrib and stronger lateral veins; pu- 
parium orange. 
Distribution. California, Washington; Colombia, 
Venezuela. 
Reference. Spencer, 1981: 262. 
Femora yellow, with dark striations; mesonotum 
matt L. montis Spencer, n. sp. 
Synopsis. Closely resembling L. sabaziae but fe- 
mora darker and mesonotum more matt; wing length 
in male 2.3 mm; male genitalia with aedeagus as 
in figures 764, 765. 
Host/Early Stages. Unknown. 
Distribution. Colorado. 
Reference. Part 2, p. 290. 
58 (50). Both vt on dark ground 59 
At least vti on yellow 67 
59 (58). Mesonotum distinctly matt black L. helianthi Spencer 
Synopsis. Frons, gena, and antenna bright yellow; 
mesonotum deep black, appearing matt viewed from 
front, though more shining from rear; scutellum 
bright yellow with only minute lateral black 
patches; mesopleuron largely yellow, black along 
lower margin with variable dark markings up front 
margin and hindmargin; legs with femora yellow, 
tibiae and tarsi more brownish; squama yellowish 
gray, margin and fringe dark; wing length 1.4-1. 5 
mm, discal cell small, last section of M 3+4 3 times 
length of penultimate; male genitalia with aedea- 
gus as in figures 766, 767; sperm pump with elon- 
gate stalk and rounded blade. 
Host/Early Stages. Helianthus annuus , Xanthium 
canadense . Larva forming narrow linear mine, with 
frass in conspicuous black strips. 
Distribution. Central California, Washington (new 
record) . 
References. Spencer, 1981: 240; part 2, p. 289. 
Mesonotum shining black 60 
60 (59). Mesonotum solidly black, without yellow patches at 
126 
