the same locality in southern 
California. 
Amauromyza ( Cephalomyza ) flavifrons 
(Meigen) 
(Figs. 528-531) 
Agromyza flavifrons Meigen, 1830: 
184. Holotype female from Germany 
in MNHNP. 
Dizygomyza (Trilobomyza) flavifrons, 
Hendel, 1931: 71. 
Trilobomyza flavifrons , Spencer, 
1969a: 160; Wheeler and Henry, 1981: 
197. 
The generic position of this distinc- 
tive species has not been entirely 
clear. Hendel' s subgenus Trilobomyza 
was raised to full generic status by 
Spencer (1969a), but Trilobomyza was 
later treated as a subgenus of 
Amauromyza (Spencer, 1971a, 1971b). 
A. flavifrons was first recorded in 
North America (Canada) by Spencer 
(1969a). Wheeler and Henry (1981) 
recorded the species from southeastern 
Pennsylvania. Three new records are 
given here for the United States. This 
species occurs commonly on cultivated 
plants such as Dianthus and Saponaria , 
and possibly it has been introduced 
into North America relatively recently. 
Its host range is unusual, as in 
addition to the Caryophyllaceae it 
feeds commonly in Europe also on Beta 
vulgaris (Chenopodiaceae) . 
New records. 
Delaware, New Castle Co., Newark, 
Beneficial Insects Research 
Laboratory grounds, 1 reared from 
Saponaria officinalis , 7. VII. 79 (R. 
M. Hendrickson). 
Ohio, Portage Co., Kent, 4m., 6 f . , 
ex leaf mines on Lychnis alba , 
10. VI. 69 (S. Whitney), in USNM. 
Wisconsin, Dane Co., Madison, leaf 
mines on Lychnis alba , 25. VI. 75 (S. 
Tavormina) . 
Amauromyza ( Cephalomyza ) knowltoni 
Spencer, new species 
(Figs. 522, 523) 
Head. Frons 1.5 times width of eye, 
conspicuously projecting above eye in 
profile; 4 slender orbital bristles 
(upper ors missing on both sides), 
orbital setulae lacking; ocellar 
triangle not developed beyond foremost 
ocellus; gena broad, extended at rear, 
0.5 height of eye; 3d antennal segment 
small, round, arista short, bare. 
Mesonotum. 3 strong postsutural dc, 
up to 3 smaller anterior ones but 
these scarcely longer than acr, these 
irregular, in about 3 rows. 
Wing. Length in male 2.1 mm, C 
extending strongly to M 1+2, last 
section of M 3+4 longer than 
penultimate, in ratio 11:8, inner 
crossvein distinctly before center of 
discal cell. 
Color. Frons, gena, face, palpus, and 
antenna yellowish orange; upper orbit 
blackish to near level of lower ors; 
mesonotum and scutellum matt gray; 
humerus and pleura blackish gray; legs 
black but femora with knees faintly 
yellowish; squama and fringe yellowish; 
halter whitish yellow. 
Male genitalia. Aedeagus (figs. 522, 
523) with curving area of spinulose 
membrane below distal end of distiphal- 
lus and separate spinose membrane 
below black base of distiphallus ; 
sperm pump with blade elongate, only 
slightly widening distally. 
Host/early stages. Unknown. 
Holotype m. , Utah, Utah Co., American 
Fork Canyon, 21. VII. 60 (G. F. 
Kn owl ton), in UCD. 
Remarks. The male genitalia indicate 
that this species is closely related 
to A. auriceps , but the two are 
immediately distinguishable by the 
differing color of the antennae. 
275 
