’20] 
218 ENTOMOLOGICAL NEWS p.©.6. 404 
pleura yellow with two brown longitudinal stripes; halteres brown, the 
knobs yellow; legs brown; wings yellowish gray, the stigma indistinct; 
male hypopygium with the outer pleural appendage a chitinized hook - 
with a short horn near its base. 
o&. Length about 4 mm.; wing 3.8 mm. 
Rostrum brown; palpi dark brown. Antennae of the male provided 
with very long verticils as usual in this group of species; first scapal seg- 
ment yellow; second scapal segment enlarged, dark brown, margined with 
yellow; remainder of the antenna dark brown. Head light yellow with 
a large brown blotch on the vertex. 
Pronotum whitish yellow. Mesonotal praescutum with three dark 
brown stripes that are sparsely purplish gray pruinose, entirely confluent 
in front, separated behind to show the yellow ground-color; lateral mar- 
gins of the praescutum broadly yellow; scutum yellow, the center of each 
lobe purplish brown, this color produced by the backward extension of 
the lateral praescutal stripes; scutellum yellow, with a conspicuous brown 
median blotch at the base; postnotum brownish. Pleura yellow with 
two conspicuous brown longitudinal stripes, the more ventral suffusing 
the sterno-pleurites; mid-line of the sternum yellow. Halteres pale 
brown, the base of the stem and the base of the knobs darker; remainder 
of the knobs conspicuously light yellow. 
Legs with the coxae and trochanters pale; remainder of the legs pale 
brown, the distal tarsal segments darker. 
Wings with a strong yellowish gray tinge; stigma barely indicated by 
a long, dusky suffusion in cell Rr; veins pale. Venation: Sc rather 
short, Scr ending a short distance before the origin of Rs; Sc2 removed 
from the tip of Scr to a distance that is but little shorter than r—m; Rs 
rather short, almost square at origin; cell rst M2 broad, the basal deflec- 
tion of Cuz at or immediately before its fork. 
Abdominal tergites dull yellow, with a broad, brownish median stripe; 
sternites yellow. Male hypopygium with the pleurites moderately 
stout, the outer angle produced into a long, stout, fleshy lobe; outer 
pleural appendage a long, chitinized. hook that is broad at the base, nar- 
rowed gradually to the sinuous, acute tip, beyond the base with a short, 
stout horn; inner pleural appendage very small, fleshy, provided with 
stout bristles and tipped with a powerful spine. Penis-guard formed as 
two parallel flattened blades, the tips blackened and produced into a 
short beak that is directed cephalad; gonapophyses black, bent slightly 
at their tips which’ are minutely and irregularly toothed. 
Habitat: Argentina. 
Holotype, &, Province of Buenos Aires, October II, 1919, 
(C. Bruch). 1 @&, 2 9, La Aranja, Alta Gracia, Proy.ide 
Cérdoba, April 1-8, 1920 (C. Bruch). 
