strong ori; gena about 0.33 height of eye; arista 
appearing bare; male genitalia with aedeagus as in 
figures 106, 107. 
Host/Early Stages. Cirsium occidentale , probably 
other Cirsium spp. Larva internal stem borer but 
unknown . 
Distribution. California, (?) New York. 
Reference. Spencer, 1981: 49. 
Remarks. A single female from New York, Tioga Co., 
Owego, 13.V.22 (L. R. West, CUl) , possibly repre- 
sents this species, but confirmation is desirable 
from a male. 
Smaller species 48 
48 (47). Distinct facial keel dividing base of antennae 49 
No obvious keel present 50 
49 (48). Frons not projecting above eye M. palaensis Spencer 
Synopsis. Small species, wing length in male 1.9 
mm; 2 ors, 4 strong ori, orbital setulae sparse, 
reclinate; gena narrow, 0.17 height of eye; facial 
keel raised below antennal bases, lower and 
broader above; mesonotum and abdomen shining 
black; male genitalia with aedeagus as in figures 
108, 109. 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 54. 
Frons strongly projecting above eye 
M. lomatii Steyskal 
Synopsis. Large species, wing length 2.6-3.25 mm; 
2 ors, 4 ori, orbital setulae numerous, in 2 rows, 
inner row conspicuously proclinate; gena broad, 
0.33 height of eye; facial keel broad, moderately 
raised; mesonotum and abdomen greenish black; male 
genitalia with aedeagus having conspicuous gap 
between basal sclerites and distiphallus complex 
(fig. 110). 
Host/Early Stages. Lomatium nudicaule. Larva in- 
ternal stem borer. 
Distribution. Oregon. 
Reference. Steyskal, 1981: 38. 
50 (48) . Mesonotum or abdomen greenish or coppery 51 
— Mesonotum and abdomen black 59 
51 (50). Orbital setulae in 2 rows, inner row proclinate, 
outer reclinate 52 
— Orbital setulae in single row, proclinate or 
reclinate 54 
52 (51). Frons broad, twice width of eye, strongly pro- 
jecting above eye M. maligna Spencer 
Synopsis. Small species, wing length in male 2.3 
mm; 2 ors, 3 ori; gena broad, 0.33 height of eye; 
mesonotum matt, faintly greenish from rear, 
abdomen weakly shining, greenish or coppery; male 
genitalia with aedeagus as in figures 111, 112. 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 49. 
30 
