wing with costa extending to vein M 1+2, last and 
penultimate sections of M 3+4 equal. 
Host/Early Stages. Unknown. 
Distribution. Wyoming. 
Reference. Part 2, p. 270. 
Larger species, wing length in male 3 mm 
A. nevadensis Spencer 
Synopsis. Frons orange, not projecting above eye, 
upper orbit black; 2 ors, 2 or 3 ori; 3d antennal 
segment pale, brownish, darker on outside; gena 
extended at rear, 0.40 height of eye; presutural 
dc strong, equal to 3d; legs black but all knees 
distinctly yellow; squama whitish or pale gray, 
fringe ochreous; male genitalia with aedeagus as 
in figures 439, 440. 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 116. 
Remarks. The male genitalia show this species to 
be closely related to A. nearctica Sehgal (1971: 
fig. 10), but in A. nearctica the costa extends 
only to vein R 4+5. 
39 (35). Frons predominantly black 40 
Frons brown 42 
40 (39). Midtibia with strong lateral bristles 
A. vockerothi Spencer 
Synopsis. Small dark species, wing length 2. 3-2.5 
mm, essentially as in A. potentillae (couplet 41); 
male genitalia with aedeagus (figs. 441, 442) end- 
ing in 2 discrete sclerotized processes; sperm 
pump (fig. 443) with narrow blade. 
Host/Early Stages. Unknown. 
Distribution. North Carolina (new record); Canada. 
References. Spencer, 1969a: 60; part 2, p. 269. 
Midtibia without differentiated bristle 41 
41 (40). Male genitalia with aedeagus (fig. 445) ending in 
single sclerotized process 
A. potentillae (Kaltenbach) 
Synopsis. 3d antennal segment small, round, with 
distinct pubescence at upper corner (fig. 444); 
gena extended at rear, 0.20 height of eye; mesono- 
tum blackish gray, with 3+1 dc; legs largely 
black, foreknee occasionally paler, tibiae and 
tarsi generally dark; squama gray, margin and 
fringe black; wing length 2.2-3 mm; male genitalia 
with aedeagus (fig. 445) having long membranous 
gap between pigmented distiphallus and basal 
sclerites; sperm pump (fig. 446) minute with nar- 
row blade. 
Host/Early Stages. Only recorded host in America 
Potent ilia gracilis , known on many genera of 
Rosoideae in Europe. Larva with 2 equal teeth on 
mouth parts (fig. 447), forming linear blotch mine 
(fig. 448); puparium reddish brown, posterior 
spiracles each with 3 bulbs. 
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