Genus Agromyza Fallen 
Agromyza Fallen, 1810: 21. Type of 
genus: Agromyza reptans Fallen, 
1823b (Sweden). 
Domomyza Rondani, 1856: 121 (synonymy 
established by Hendel, 1927). Type 
of genus: Domomyza cincta Rondani, 
1856 (Italy). 
The accepted concept of Agromyza can 
be defined by the following combina- 
tion of characters: Subcosta complete, 
joining vein R 1 before reaching costa 
(fig. 4); halter white or yellow 
(darker in a few tropical species); 
orbital setulae reclinate; either 3+1 
strong dorsocentrals or 3 or more 
postsutural dc, greatly decreasing in 
size, with any presutural small and 
weak; costa ending at vein R 4+5 or 
continuing to M 1+2; outer crossvein 
normally present; color in most 
species black, less frequently head or 
also body partially yellowish; wing 
length 2-4 mm. 
The course of the subcosta in some 
species of Phytobia (p. 72) may appear 
similar to that in Agromyza , and in 
consequence the generic position of 
such species may be incorrectly 
interpreted. Tschirnhaus (1971) 
discovered that a structure considered 
as a stridulating mechanism is present 
in both sexes of Agromyza , but it is 
entirely lacking in Phytobia . This 
structure consists of a band of 
chitinized scales lying immediately 
below the lower margin of the fused 
tergites 1 and 2 (figs. 346, 347) and 
a scraper, a sharp chitinized ridge on 
the inner surface of the hindfemur 
(fig. 348). This structure can be 
accepted as a definitive generic 
character of Agromyza . 
Agromyza is a large genus, with about 
170 species throughout the world. In 
the United States, 37 described species 
are known and 1 additional species 
from Wyoming is diagnosed but not 
formally described. Ten other species 
are known in Canada (Spencer, 1969a; 
Sehgal, 1971). In Europe, 72 species 
are known, but the smaller number in 
North America almost certainly 
reflects insufficient collecting. 
Six new species are described here and 
four new synonyms are established 
(part 2, p. 262). In addition, six 
species are recorded, previously known 
only in Canada: A. albertensis , A. 
bispinata , A. hockingi , A. masculina , 
A. tacita , and A. vockerothi . Two 
species — A. albitarsis Meigen (part 2, 
p. 262, under A. isolata ) and A. 
nigripes Meigen (part 2, p. 262, under 
A. albipennis ) — must now be deleted 
from the United States list, as 
previous records have been found to be 
based on misidentif ications . 
Except for two species in Europe, one 
known as a gall causer and the other 
as a stem miner, all Agromyza larvae 
whose feeding habits have been 
discovered are leaf miners. The two 
main groups that are well known in 
Europe (Spencer, 1976a) are also the 
largest groups in the United States. 
The largest is that feeding on 
Poaceae. Of these, 6 species have 
been reared, but 18 species in all 
belong here. The presutural 
dorsocentral is lacking and the male 
genitalia are characteristic (figs. 
368, 388). There may be a distinctive 
arrangement of spines within the 
epandrium (figs. 410, 413). 
Another large group is that associated 
with the Rosaceae, and closely related 
to them are feeders on Fabaceae, 
Salicaceae, and Ulmaceae. Seven 
species have been reared in this group 
and four others clearly belong here. 
Five feeders on Boraginaceae and 
Urticaceae form a compact group, of 
which only the two leaf miners on 
Urtica have been reared. Only a 
single species, Agromyza ambrosivora , 
is known to feed on Asteraceae, but A. 
virginiensis probably has its host in 
the same family. A. pallidiseta is 
known only from females and its exact 
affiliation is uncertain. 
Agromyza is poorly represented in the 
Southern States, with only four 
species known in Florida (Spencer and 
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