This is a widespread leaf miner on 
Urtica in Europe, Canada, and the 
United States. Frick (1952a) and some 
European workers confused A. reptans 
with A. pseudoreptans Nowakowski, 
which also feeds on Urtica , but the 
male genitalia of the two species are 
entirely distinct (figs. 395, 399). 
Nowakowski illustrated the male 
genitalia of two specimens from Europe 
(1962: fig. 8, Galicia , and 1964: fig. 
14, Estonia), showing the long disti- 
phallus as narrowly divided in the 
distal two-thirds before the two 
tubules diverge at right angles at the 
apex. The holotype of A. reptans has 
been reexamined and the distiphallus 
is fully fused, apart from the apical 
divergence. Other specimens have been 
examined from Italy and from northern 
Germany (Tschirnhaus ) . They agree 
exactly with the holotype. 
Steyskal (1972b) described A. haplacme 
from Michigan, showing the distiphallus 
as fused and treating this as distinct 
from A. reptans on the basis of 
Nowakowski' s illustrations. However, 
this species is clearly identical with 
A. reptans , and this new synonymy is 
established here. A minor inaccura- 
cy in Steyskal' s illustration must be 
pointed out, as only the left side of 
the apical division of the distiphallus 
is shown, that on the right presumably 
being obscured. Other males have been 
examined from California, Washington, 
and Ontario and all have the disti- 
phallus as shown in figure 396. A 
slight variation is noted in North 
American specimens. The distal end of 
the basal sclerites is somewhat 
rounded in the specimens from Michigan 
and California but more angular in one 
seen from Ontario, bending almost at 
right angles as is normal in European 
specimens. However, splitting of A. 
reptans on this variable character 
alone is not considered justifiable. 
It is puzzling that Nowakowski (loc. 
cit.) should have shown the distiphal- 
lus as divided in both specimens 
illustrated. It is conceivable but 
highly improbable that there is a 
second species in Europe, but more 
likely these illustrations seem to 
reflect an inaccurate observation. 
Agromyza tacita Spencer (new to 
U.S.A.) 
(Figs. 403-407) 
Agromyza tacita Spencer, 1969a: 59. 
Holotype male from Ontario in CNC. 
This species was described from a 
series from Ontario, Manitoba, and 
Quebec. The host was unconfirmed. 
A single male reared from an unidenti- 
fied grass has now been seen from 
Montana, Lake County, 15 miles 
northeast of Poison, 22. VII. 67 (S. 
Whitney), in KAS. The posterior 
spiracles of the puparium are closely 
adjoining (fig. 407), in contrast to 
those of A. par vicornis and A. proxima 
(figs. 420, 423), in which they are 
widely separated. 
A. tacita belongs to a compact group, 
including also A. bispinata and A. 
hockingi . All have the distinctly 
pubescent third antennal segment, but 
the arrangement of bristles within the 
epandrium consistently differs and 
there are also significant differences 
in the aedeagus. It will be of 
interest to discover whether the three 
species are restricted to different 
genera of the Poaceae. 
Agromyza utahensis Spencer, new species 
(Figs. 363-366) 
Head (fig. 363). Frons 1.5 times 
width of eye, distinctly projecting 
above eye toward base of antennae; 4 
orbitals, arrangement somewhat 
variable, upper frequently slightly 
longer, reclinate, other 3 more 
incurved, sometimes both ors reclinate 
and 2 ori incurved, orbital setulae 
sparse, reclinate; ocellar triangle 
short, apex not reaching level of 
lower ors; gena broad, extended at 
rear, 0.25 height of distinctly 
slanting eye; 3d antennal segment 
angulate but variable, sometimes 
finely pointed (fig. 363) but not 
infrequently more obtuse. 
268 
