Cerodontha ( Butomomyza ) subangulata 
(Mai loch) — 
(Figs. 589-592) 
Agromyza subangulata Malloch, 1916: 51. 
Holotype male from Illinois in IINR. 
Phytobia (Poemyza) subangulata, Frick, 
1959: 382. 
Cerodontha ( Dizygomyza ) subangulata , 
Spencer, 1969a: 297. 
Malloch described this species from a 
single male, differentiating it from C. 
angulata primarily by a venational 
character, the outer crossvein being 
only its own distance from the inner. 
Frick (1959) used this character, also 
considering the femora on the midleg 
and hindleg to be dark in C, subangu - 
lata and yellow in £. angulata . 
However, on external characters, 
differentiation of C. subangulata and 
others in the angulata group may be 
difficult, but the male genitalia of 
C, subangulata are distinctive (figs. 
589, 590), with the distal tubules 
largely fused and the curve shallow. 
The bristles on the lower corner of 
the epandrium are also arranged 
differently, being at the end of an 
inwardly curving process (fig. 591), 
not at the actual corner (contrast 
angulata , fig. 584). 
The aedeagus (fig. 592) of a specimen 
from Maryland, Montgomery County, 
Cabin John Creek, 24. VIII. 76 (KAS), 
somewhat resembles that of C . (IJ. ) sub - 
angulata but possibly represents 
another undescribed species in this 
group . 
Cerodontha ( Dizygomyza ) aristosa 
Spencer, new species ~~ 
(Figs. 605-607) 
Head. Frons twice width of eye, only 
very slightly projecting above eye at 
base of antennae; orbit slightly 
widening toward lunule, with 2 ors, 2 
ori, orbital setulae sparse, reclinate; 
lunule semicircular; gena broad, almost 
0.25 height of eye; 3d antennal 
segment enlarged in male, round with 
fine pubescence, arista conspicuously 
swollen in lower 3d (fig. 605). 
Mesonotum. 3+1 dc, presutural weaker 
than 3d, acr short, sparse, in 6 rows 
in front, prsc lacking. 
Wing. Length in male 2.5 mm, last 
section of M 3+4 distinctly shorter 
than penultimate, in ratio 5:8, inner 
crossvein slightly before midpoint of 
discal cell. 
Color. Frons brownish black, orbit 
darker, blackish, weakly shining; 
lunule brownish, slightly grayish seen 
from front; antenna black; mesonotum 
matt grayish black; pleura entirely 
black, even upper margin of mesopleuron 
not paler; legs almost entirely black, 
only foreknee narrowly yellowish; 
abdomen black; squama and fringe 
yellow. 
Male genitalia. Aedeagus (fig. 606) 
with upper curve of distal tubules 
large, more than a semicircle, distal 
end not divided, directed ventrally; 
sperm pump with large blade, fanlike; 
surstylus with row of 5 or 6 short 
spines; anal projection prominent 
(fig. 607). 
Host/early stages. Unknown. 
Holotype m. , North Carolina, Haywood 
Co., Pisgah National Forest, Chestnut 
Bald, 5,900 ft, 2. VIII. 57 (J. G. 
Chillcott ) , in CNC. 
Remarks. The male genitalia suggest 
close relationship with £. ultima 
Spencer, 1969a, described from 
Ontario, but the two species differ in 
a number of morphological characters. 
Cerodontha ( Dizygomyza ) fasciata 
(Strobl) (new to U.S.A. ) 
(Fig. 610) 
Phyllomyza fasciata Strobl, 1880: 38. 
Lectotype male from Austria in coll. 
Strobl, Admont, Austria. 
Cerodontha ( Dizygomyza ) fasciata , 
Spencer, 1971a: 153 (lectotype 
designation); 1976a: 220. 
This species was misidentif ied in 
Alberta and Ontario as C. (D. ) 
282 
