Distribution. California; new records: Colorado, 
Utah; widespread in Canada, Europe; Japan. 
References. Frick (1959: 358, as A. spiraeae ) ; 
Spencer, 1969a: 55 (as A. spiraeae ) ; 1981: 122; 
part 2, p. 266. 
Male genitalia with aedeagus (figs. 449, 450) end- 
ing in 2 discrete sclerotized processes 
A. masculina Sehgal 
Synopsis. Small dark species, wing length up to 
2.5 mm; male genitalia with aedeagus (figs. 449, 
450) having distal process enlarged, only short 
gap between distiphallus and well-defined U-shaped 
process behind; sperm pump (fig. 451) with large 
blade . 
Host/Early Stages. Unknown. 
Distribution. Utah (new. record) ; Canada. 
References. Sehgal, 1968: 59; Spencer, 1969a: 48; 
part 2, p. 265. 
42 (39). Frons pale brown or almost reddish A. leechi Spencer 
Synopsis. Agreeing closely with A. potentillae but 
frons distinctly paler; wing length up to 2.5 mm; 
male genitalia with aedeagus (figs. 452, 453) 
having distiphallus at right angles to basal 
sclerites; sperm pump minute. 
Host/Early Stages. Unknown. 
Distribution. N. California; Alaska, Canada. 
References. Spencer, 1969a: 47; 1981: 115. 
Frons dark brown A. fragariae Mai loch 
Synopsis. Small black species, wing length about 
2.4 mm; agreeing closely with A. isolata, but 
tibiae and tarsi darker, brownish black; male 
genitalia with aedeagus (figs. 454, 455) having 
single area of pigmentation distally; sperm pump 
(fig. 456) greatly enlarged. 
Host/Early Stages. Fragaria spp. Larva forming 
linear blotch mine (fig. 457); (details of pupar- 
ium not recorded) . 
Distribution. California, certainly more wide- 
spread; Canada. 
References. Malloch, 1913a: 307; Frick, 1959: 358 
(as A. spiraeae ) ; Spencer, 1969a: 42; 1981: 42. 
SUBFAMILY PHYTOMYZINAE 
Genus Phytobia Lioy 
Phytobia Lioy, 1864: 1313. Type of 
genus: Agromyza errans Meigen, 1830 
(Europe) . 
Dizygomyza ( Dendromyza ) Hendel, 1931: 
22 . 
Shizukoa Sasakawa, 1963a (synonymy 
established by Spencer, 1965d). 
Essential characters of this genus are 
the erect or reclinate orbital 
setulae, strongly developed, pre- 
sutural, dorsocentral prescutellars , 
and vein R 4+5 ending nearer the wing- 
tip than M 1+2. The frons is normally 
dark but sometimes reddish and the 
71 
