2. 3-2.6 mm, 2d costal section 1.5-2. 5 times 
length of 4th; male genitalia with aedeagus 
(fig. 1247) having strong patch of spinules 
above left basal sclerite and small patch at 
front end of right sclerite; distiphallus regu- 
larly curving, unpigmented except at base, di- 
vided distally. 
Host/Early Stages. Arnica spp. Larva probably 
forming linear blotch mine (no well-preserved 
mines available, but see fig. 1365); puparium 
reddish brown, posterior spiracles each with 
15-17 bulbs. 
Distribution. Possibly Alaska, California, 
Colorado (new record); northern Sweden (type 
locality) . 
References. Griffiths, 1974b: 111; Spencer, 
1976a: 385; part 2, p. 310. 
82 (1). 2 equal ors present 83 
Upper ors shorter than lower or lacking 117 
83 (82). Humerus and notopleuron bright yellow 
F. notopleuralis Spencer 
Synopsis. Frons black, not projecting above 
eye, orbit similar but narrowly yellow along 
inner margin; 3d antennal segment small, round, 
black, 2d yellowish; mesonotum matt blackish 
gray, acr in 4 rows; legs with femora black and 
all knees yellow, tibiae and tarsi pale, yel- 
lowish brown; squama yellow, fringe black; wing 
length in male 2 mm, 2d costal section just 
less than 3 times length of 4th; male genitalia 
with aedeagus as in figure 1248. 
Host/Early Stages. Unknown. 
Distribution. Michigan (new record); Canada. 
References. Spencer, 1969a: 259; Griffiths, 
1980: 6; part 2, p. 319. 
Humerus and notopleuron largely dark 84 
84 (83). Orbit bright yellow Chromatomyia orbitella Spencer 
Synopsis. Frons and lunule black, 2 ors, 1 ori; 
gena 0.4 height of eye, yellow; face, palpus, 
and antenna black, 3d segment slightly enlarged, 
with fringe of short pubescence; mesonotum matt 
gray, with faint brownish tinge, acr in 2 rows; 
side of thorax blackish gray; legs black but 
all knees bright yellow; squama gray, margin 
and fringe blackish; wing length in male 
2.3 mm, 2d costal section slightly less than 
twice length of 4th; male genitalia with aedea- 
gus as in figures 1249, 1250. 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 448. 
- Orbit at most narrowly yellowish on inner mar- 
gin 85 
85 (84). Abdomen with at least tergites 1-3 conspicuously 
yellow P. bicolor Coquillett 
Synopsis. Frons variable, black or yellowish 
203 
