Phytobia waltoni (Malloch) 
(Figs. 476-478) 
Agromyza waltoni Malloch, 1913a: 303. 
Holotype female from New York in 
USNM. 
Phytobia (Dendromyza) waltoni, Frick, 
1959: 377. 
Phytobia waltoni , Spencer, 1969a: 109. 
This species was described on the 
basis of its distinctive venation, 
with the outer crossvein less than its 
own length from the inner (fig. 476). 
The male has not previously been 
critically examined, but, with the 
identification of two males recorded 
here, it has now been possible to 
examine the male genitalia. The 
distinctive aedeagus (figs. 477, 478) 
fully confirms the diagnosis 
previously made from a single 
venational character. The aedeagus is 
almost completely membranous and 
entirely distinct from that of any 
other species known in the genus. 
New records. 
North Carolina, Macon Co., Highlands, 
3,800 ft, 1 f . , 9.V.57 (J. R. 
Vockeroth), in CNC; Swain Co., 
"Smokies," Andrews Bald, 2m., 2 f . , 
9. VII. 41 (A. L. Melander), in USNM. 
Phytobia sp. (Salix) 
(Fig. 483) 
A single female has been seen from New 
York, Fulton County, Broadalbin, 
28. IV. 67 (L. L. Pechuman) , in CUI, 
collected on Salix sp. It is reason- 
able to assume that Salix is the host 
(on which P. cambii Hendel, 1931, 
occurs commonly in Europe) , but 
describing the species is not proposed 
until a male is available for 
examination of the genitalia. 
This female appears to be distinguished 
from P. setosa by the deep black 
antennal segments and possibly by the 
slightly higher epistoma. The frons 
also is uniformly black. However, 
more material definitely associated 
with Salix will be necessary before 
this species can be properly diagnosed. 
Males have been examined from New York 
(USNM) and Wisconsin (CUI), in which 
the distal tubules are shorter and 
more curving than in P. setosa and the 
basal sclerite is shorter (fig. 483). 
Possibly these specimens represent the 
Salix feeder, but the aedeagus differs 
in detail between the three specimens 
seen, and their status requires 
further clarification. 
GENUS AMAUROMYZA HENDEL 
Subgenus Cephalomyza Hendel, 1931: 32. 
Type of subgenus: Dizygomyza 
luteiceps Hendel, 1920, from Germany. 
Subgenus Trilobomyza Hendel, 1931: 71. 
Type of subgenus: Agromyza flavi- 
frons Meigen, 1830, from Germany. 
In the original concept of Hendel 
(1931: 59), Amauromyza was a small, 
simple subgenus of Dizygomyza ; the 
most important single character was 
the black halter. No complete 
revision of the genus has been 
undertaken subsequently, but several 
partial revisionary publications have 
appeared and the male genitalia of 
many species have been illustrated. 
In its currently accepted sense, 
Amauromyza comprises an assemblage 
with diverse external characters. The 
color may be entirely black, or the 
frons may be yellow, with the third 
antennal segment yellow or black, the 
notopleuron dark or yellow, the halter 
black, yellow, white, or variegated 
(A. maculosa ) , and the presutural 
dorsocentral strongly developed or 
lacking. However, a constant character 
in the male genitalia is the large 
sperm pump, with a conspicuously 
enlarged, bowl-shaped base (figs. 509, 
514). 
There has been some confusion about 
the identity of the type of the genus 
Agromyza lamii Kaltenbach, 1858. This 
was briefly described by Kaltenbach 
from specimens reared in Germany from 
Ballota and Lamium (see Spencer and 
272 
