Color. Frons matt black, ocellar 
triangle and orbits weakly shining 
black; raesonotum blackish green; 
abdomen greenish coppery; squama and 
fringe white. 
Male genitalia. Aedeagus as in figures 
58, 59. 
Host/early stages. Unknown. 
Holotype m. , Virginia, Montgomery Co., 
Blacksburg, 28.V.62 (J. G. C.), in CNC. 
Remarks. The aedeagus of this species 
is distinctive but somewhat resembles 
that of M. occidentalis Spencer 
(1969a: figs. 102, 103), which is 
widespread in western Canada. 
Me 1 ana gr omy z a walleyi Spencer, new 
species 
(Figs. 44, 45) 
Head. Frons less than 1.5 times width 
of eye, not significantly projecting 
above eye in profile; 2 ors, 3 ori, 
orbital setulae sparse but in 2 rows, 
those nearest eye margin reclinate, 
inner row more proclinate; ocellar 
triangle well defined but small, apex 
not extending beyond level of lower 
ors; orbits broad, widest between 
lower ors and upper ori; eye in male 
with distinct pilosity at level of 
ors; gena narrow, about 0.2-0.17 height 
of eye; 3d antennal segment small, 
round, arista long, appearing bare. 
Mesonotum. 2 dc , acr numerous, in 
some 10 rows. 
Wing. Length 2.7 mm, inner crossvein 
distinctly beyond midpoint of discal 
cell, last section of M 3+4 short, 
little more than half length of 
penultimate, in ratio 20:37. 
Color. Orbit and ocellar triangle 
weakly shining black; mesonotum 
shining, bluish black; abdomen more 
greenish; squama and fringe white. 
Male genitalia. Aedeagus as in figures 
44, 45. 
Host/early stages. Unknown. 
Holotype m. , Tennessee, Hamilton Co., 
East Ridge, 9.V.52 (G. S. Walley), in 
CNC. 
Remarks. This species closely 
resembles M. hicksi Steyskal feeding 
in stems of Althaea , but this does not 
necessarily indicate that the two are 
closely related. 
Melanagromyza sp. (Maryland) 
(Figs. 139-142) 
A new species has been seen from 
Maryland, Montgomery County, Wheaton, 
27-28. V. 79 (A. Freidberg), in USNM, 
but this is not formally described and 
is not included in the key, as it is 
believed that the chaetotaxy of both 
head and mesonotum is abnormal. On 
the head the lower orbital bristles 
are strongly proclinate and the outer 
vertical bristles are duplicated on 
both sides (fig. 139). The 
arrangement of the dorsocentrals on 
the mesonotum is irregular, and it is 
uncertain whether the normal 
arrangement is two or three pairs. 
The male genitalia are distinctive and 
the aedeagus is shown in figures 140, 
141; the surstylus bears strong 
bristles and a row of bristles 
continues along the inner margin of 
the epandrium (fig. 142). Such an 
arrangement is unusual in Melanagromyza 
but has been seen in a few species 
elsewhere, for example in M. polymniae 
Spencer, 1973b, from Venezuela (see 
Spencer, 1977c: fig. 9). 
It is hoped that further collecting at 
the locality where this specimen was 
obtained will produce additional 
material to permit full clarification 
of this interesting species. 
GENUS HEXOMYZA ENDERLEIN 
One new synonymy is established and 
the status of one species is discussed. 
Hexomyza salicis (Malloch) 
(Figs. 151-153) 
Agromyza salicis Malloch, 1913a: 314. 
249 
