Three subgenera are recognized here, 
based largely on genitalia characters 
(see key). The largest is Cephalomyza , 
with 17 named species, of which 9 were 
recently described in California and 2 
other new species are described here 
(part 2, p. 273). A new subgenus , 
Catalpomyza , was erected by Spencer 
(1977c) for the isolated species 
feeding on Catalpa . Another subgenus, 
Annimyzella , was erected by Spencer 
(1981) to embrace the nearctic and 
neotropical species A. maculosa , which 
is common on many genera of 
Asteraceae, and a distinctive new 
species known only in California, A. 
lathyroides , feeding on Lathyrus . The 
latter possibly deserves separate 
subgeneric status but is included 
provisionally in Annimyzella . 
The larvae in this genus either form 
large blotch mines or feed internally 
in stems. The host is known only of 5 
of the 20 recorded species, in the 
families Amaranthaceae, Asteraceae, 
Bignoniaceae , Caryophyllaceae , and 
Fabaceae. The small proportion with 
known hosts suggests that most of 
those of unknown biology are internal 
feeders rather than leaf miners. 
Two new combinations are established 
here. Three other species are known 
in Canada (Spencer, 1969a; Sehgal, 
1971). 
Key to Amauromyza 1. Male genitalia with ejaculatory duct enlarged, in 
Subgenera form of paired tubules (figs. 493, 494, 512, 513) 
Annimyzella Spencer 
Male genitalia with ejaculatory duct reduced, without 
such large tubules 2 
2 (1). Distiphallus with associated spiculate membrane of 
varying form (figs. 489-491, 498-500, 504, 516-527, 
529, 532, 533, 535, 536) Cephalomyza Hendel 
Distiphallus largely membranous, without any spicu- 
late membrane (figs. 506, 507) Catalpomyza Spencer 
Note. The species now known in the United States are 
included in the single key here based on artificial 
external characters, which may be without subgeneric 
significance . 
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