stridulating mechanism present in all 
Agromyza species is also lacking. 
Despite the uncharacteristic external 
morphology, J. rutiliceps is therefore 
transferred to Japanagromyza here. 
Agromyza irwini was described from 
three females in California and before 
the holotype of A. rutiliceps had been 
examined. There was no reason to 
suspect that it was not an Agromyza , 
generally resembling A. nevadensis 
(p. 70). Although the distinctive 
distiphallus of the holotype of J. 
rutiliceps was lost during previous 
preparation, this species can now be 
associated both with males now seen 
from Idaho and Utah and also with the 
females of A. irwini , which is 
therefore synonymized with J. 
rutiliceps here . 
J. rutiliceps appears to be a primitive 
species, retaining several morphologi- 
cal characters shared with Agromyza at 
an early stage in the evolution of the 
two genera but now lost in other 
members of the genus. 
We are grateful to Michael von 
Tschirnhaus for valuable discussions 
on this interesting species and in 
particular for his perspicacious 
assessment of its correct generic 
position. 
GENUS AGROMYZA FALLEN 
Six new species are described, four 
new synonyms are established, and six 
species are recorded as new to the 
United States. One undescribed 
species from Wyoming is briefly 
diagnosed. The taxonomic status of 
one species is clarified and new State 
records are given for four species. 
Agromyza albertensis Spencer (new 
to U.S.A.) 
(Figs. 373-375) 
Agromyza albertensis Spencer, 1969a: 
32. Holotype male from Alberta in 
CNC. 
A single male referable to this 
species has been identified from 
Colorado, Eagle County, State Bridge, 
7,000 feet, near Bond, 24-25. VI. 61 (C. 
H. Mann), in CNC. 
A. albertensis belongs to the closely 
related complex of grass-feeding 
species, including also in America A. 
ambigua , A. tularensis , and A. 
utahensis , in which the third antennal 
segment is angulate and the C ends at 
vein R 4+5. The male genitalia of A. 
albertensis are shown in figures 373, 
374, and the third antennal segment is 
in figure 375. 
Agromyza albipennis Meigen 
(Figs. 387-390) 
Agromyza albipennis Meigen, 1830: 
171. Two syntypes from Germany in 
NMW; female in MNHNP is not an 
agromyzid . 
Agromyza dubitata Malloch, 1913a: 
311. Two female syntypes from 
Massachusetts in USNM. NEW SYNONYM. 
Frick (1959) confused this species 
with A. nigripes Meigen, which he 
considered as having the squamal 
fringe white, whereas it is in fact 
invariably darker. A. dubitata was 
thus synonymized with A. nigripes 
(Frick, 1959: 356); however, examina- 
tion of the two type specimens (which 
are in perfect condition) immediately 
shows that they represent A. albi - 
pennis , and this new synonymy is 
established here. 
A distinctive character of A. albipen- 
nis is the shape of the third antennal 
segment (fig. 387), which is almost 
angulate at the upper corner and 
rounded below. * 
Agromyza aprilina Malloch, stat. rev. 
(Figs. 385, 386) 
Agromyza aprilina Malloch, 1915c: 
359. Lectotype female, designated 
by Frison, 1927, in INHS. 
Frick (1957b: 199) synonymized A. 
aprilina with A. subnigripes Malloch 
(1913a: 334). 
262 
