(genitalia slide No. 52229, BMNH) has 
been seen with four such bristles. 
There is thus no significant 
difference between M. minimoides and 
M. radicicola . The suspected host, 
Urtica , has nevertheless led the 
junior author to feel justified in 
describing M. radicicola as distinct 
and this is tentatively accepted here. 
Melanagr omyza riparella (Hendel) 
(Figs. 71-74) 
Agromyza riparia Malloch, 1915a: 105. 
Lectotype male from Illinois 
(designated by Frison, 1927: 194) in 
INHS . Preoccupied. 
Agromyza riparella , Hendel, 1923: 145, 
nom. nov. for A. riparia Wulp, 1871. 
Melanagromyza riparella , Frick, 1952a: 
379; 1959: 365. 
Melanagromyza lippivora Spencer, 
1966d: 11. NEW SYNONYM. Holotype 
male from Florida in USNM. 
Examination of the male genitalia 
(figs. 71, 72) of the lectotype 
satisfies us that this is identical 
with the species subsequently 
described from Florida, reared from 
seed heads of Phyla nodiflora . This 
host does not occur in Illinois, where 
the host is no doubt P. lanceolata. 
This species can now also be recorded 
from Texas, San Patricio County, Welder 
Wildlife Reserve, near Sinton, 2 miles, 
19-25. III. 65 (J. G. Chillcott ) , in CNC. 
Melanagromyza sagehenensis Spencer 
(Figs. 19, 20) 
Melanagromyza sagehenensis Spencer, 
1981: 56. Holotype male from 
California in UCD. 
This species was described from four 
specimens caught at Sagehen Creek, 
Nevada County, Calif. 
Five males and six females from stems 
of Potentilla glandulosa , 3 miles south 
of Ronan, Lake County, Mont., 27. VII. 69 
(D. Witwer), have recently been ex- 
amined, which agree in all respects 
with M. sagehenensis . The host plant 
was in fact noted at Sagehen Creek 
during a visit there by KAS in 
September 1978. 
Melanagromyza tetrica Spencer (new 
to U.S.A.) 
(Figs. 133, 134) 
Melanagromyza tetrica Spencer, 1969a: 
76. Holotype male from Saskatchewan 
in CNC. 
This black species has hitherto been 
known only from the two type specimens. 
A single male has now been identified 
from Colorado, Clear Creek County, 
Loveland Pass, west slope, 9,850 feet, 
18. VII. 61 (B. R. Poole), in CNC. 
Although only two dc are present in 
all these specimens, the male 
genitalia (figs. 133, 134) closely 
resemble those of M. setifrons, and it 
is possible that there is variation in 
the arrangement of the dorsocentral 
bristles and that M. tetrica is in 
fact synonymous with M. setifrons . 
This should be borne in mind as more 
material becomes available. 
Melanagromyza ultima Spencer, new 
species 
(Figs. 131, 132) 
Head. Frons 1.5 times width of eye, 
not projecting above eye in profile; 2 
ors, 2 ori, orbital setulae sparse, 
reclinate; ocellar triangle short, 
apex not reaching level of lower ors; 
gena narrow, 0.1 height of eye, this 
bare; antennae narrowly separated by 
facial keel, but this not raised. 
Mesonotum. 2 dc, acr in 8 rows. 
Wing. Length in male 2.4 mm, C 
extending strongly to M 1+2, last 
section of M 3+4 distinctly shorter 
than penultimate, inner crossvein just 
beyond center of discal cell. 
Color. Ocellar triangle only weakly 
shining; mesonotum and abdomen 
moderately shining black; squama 
ochreous gray, fringe black. 
247 
