margins; legs entirely yellow; wing length 2.3- 
2.8 mm; male genitalia with aedeagus having 
distiphallus divided, widening at end (figs. 
1093, 1094). 
Host/Early Stages. Clematis Columbiana , in Can- 
ada verticillaris . Larva forming upper sur- 
face linear mine, pupating in leaf, with ante- 
rior spiracles of puparium projecting through 
epidermis; puparium yellowish brown. 
Distribution. Montana; Canada. 
Reference. Spencer, 1969a: 236. 
7 (4). 3d antennal segment brown JP. californica Griffiths 
Synopsis. Frons clear yellow; mesonotum grayish 
black, acr in 4 rows; scutellum whitish yellow; 
side of thorax broadly yellow; legs with femora 
black, yellow at knees; wing length 2.4 mm, 2d 
costal section about 3 times length of 4th; 
male genitalia with aedeagus as in figures 
1095, 1096. 
Host/Early Stages. Senecio triangularis . Larva 
forming irregular lower surface mine (fig. 
1097); puparium black, posterior spiracles each 
with about 40 minute bulbs. 
Distribution. California (El Dorado Co.). 
References. Griffiths, 1974b: 113; Spencer, 
1981: 377. 
3d antennal segment black 8 
8 (7). Minute species, wing length 1.4-1.75 mm 
Chroma tomyia clemativora 
Synopsis. Head yellow, apart from black 3d an- 
tennal segment; mesonotum banded, with dark 
areas moderately shining black, broadly yellow 
adjoining scutellum (see Frick, 1959: fig. 
146); side of thorax broadly yellow; legs with 
femora yellow; wing length from 1.45 mm in male 
to 1.75 mm in female, 2d costal section short, 
1.5 times length of 4th (see Frick, 1959: fig. 
145); male genitalia with aedeagus as in fig- 
ures 1098, 1099. 
Host/Early Stages. Clematis sp. Details of 
leaf mine not recorded. 
Distribution. Texas. 
References. Frick, 1959: 426; part 2, p. 323. 
Larger species, wing length 2-3.3 mm 9 
9 (8). 2d costal section short, less than 2.5 times 
length of 4th P. aldrichi Spencer, n. sp. 
Synopsis. Frons yellow, 1 ors, 2 equal ori; 3d 
antennal segment black, slightly longer than 
broad; mesonotum grayish black, acr in 4 rows; 
scutellum largely black but faintly yellow be- 
tween basal scutellars; legs largely black, all 
knees yellow; wing length in male 2 mm, 2d 
costal section slightly over twice length of 
4th; male genitalia with aedeagus as in figures 
1100, 1101; sperm pump with large blade. 
Host /Early Stages. Unknown. 
177 
