It is now apparent that 0. aestimabil- 
is , described from California, Mono 
County, 9,300 feet, although slightly 
smaller, is identical with 0. praecisa , 
and this new synonymy is established 
here. 
The population in the Mt. Evans area, 
Colo., is now accepted as distinct 
from 0. praecisa (see 0. subpraecisa , 
p. 258), with a number of external 
differences supported by small but 
distinctive differences in the male 
genitalia. 
Ophiomyia quinta Spencer (new to 
U.S.A.) 
(Figs. 235-238) 
Ophiomyia quinta Spencer, 1969a: 96. 
Holotype male from Ontario in CNC. 
This species was described from a 
single caught male, with the vibrissal 
corner acute, forming an angle of 
approximately 45°. It represents 
the common leaf miner on Aster and 
Solidago that was misidentif ied by 
Frost (1924: 42) as Agromyza 
curvipalpis var. texana Malloch and in 
Canada by Spencer (1969a: 89) as the 
European species 0. maura (Meigen, 
1838). 0. maura forms long, narrow 
mines on Solidago and the vibrissal 
corner forms an angle of 80°-90°. 
It has been puzzling that in North 
America 0. maura should also feed on 
Aster , which is never attacked in 
Europe . 
It has now been possible to examine 
the genitalia of males reared from 
Solidago by Frost from Ithaca, N.Y. , 
and from Aster at Hot Springs, Ark. 
(KAS). The aedeagus of these two 
populations is identical to that of 0. 
quinta ; it is of the same general form 
as in 0. maura but more strongly 
pigmented. 
Four distinct populations of this 
complex can now be identified: 
(1) True £. maura occurring in Europe 
and feeding exclusively on Solidago . 
The aedeagus is pale, without pigmenta- 
tion. The vibrissal angle is approxi- 
mately 80°-90°. 
(2) In Japan, Sasakawa (1961: 358) has 
recorded £. maura as feeding on both 
Aster and Solidago , and he synonymized 
0. asteris Kuroda, 1954, with 0. 
maura . The form of the gena and the 
aedeagus (Sasakawa, 1961: figs. 38, a 
and 38, d) agrees with that of true 0. 
maura, but this population has already 
colonized Aster . 
(3) In Alberta, G. C. D. Griffiths has 
reared specimens from Solidago (the 
species also occurs there on Aster). 
The aedeagus is as in European 0. 
maura, but the gena is acute. ~~ 
(4) In eastern North America (Ontario, 
New York, Arkansas), the gena forms an 
angle of approximately 45° (fig. 
235), and the aedeagus is heavily 
pigmented. Aster is attacked as 
frequently as Solidago . 
With the name Q. quinta available for 
the eastern North American population, 
it is proposed to treat this as 
distinct from the European 0. maura . 
The status of the population in Japan 
and western Canada requires further 
clarification. No representative of 
this complex has so far been found in 
California. 
Specimens examined. 
Arkansas, Garland Co., Hot Springs 
National Park, 2 m. , emerged 20 and 
21.V.79 from leaf mines on Aster sp., 
coll. 15.V.79 (KAS), in KAS” 
New York, Tompkins Co., Ithaca, 1 m. , 
"linear Solidago , " 7. IX. 18 (S. W. F.), 
in PSU. 
Pennsylvania, Adams Co., Arendtsville , 
1 f., " Solidago ," 1. VIII. 26 (S. W. F.), 
in PSU. 
Ophiomyia sexta Spencer (new to U.S.A.) 
(Figs. 290-292) 
Ophiomyia sexta Spencer, 1969a: 98. 
Holotype male from Alberta in CNC. 
This distinctive species is known from 
Alberta, Manitoba, Northwest Terri- 
tories, and Quebec in Canada. The 
first specimen from the United States 
can now be recorded from Colorado, 
Boulder County, Boulder, Flagstaff 
Canyon, 5,800 feet, male, 10. VI. 61 (C. 
H. Mann), in CNC. 
257 
