442 
CHARLES T. BRUES 
quite well-developed, but the other frontal bristles very short and weak. 
Ocelli close together, on a distinct tubercle. Antennæ black, with velvety 
pubescence; third joint circular in lateral view, but appearing compres¬ 
sed when seen from the front. Arista with the two basal joints very 
stout, bare; third joint strongly pubescent. Palpi black, with numerous 
short bristly hairs about their tips ; proboscis very short, castaneous. 
Mesonotum very shining and sparsely clothed with short hairs, with a 
large, very distinctly impressed, area before the scutellum ; scutellum 
with two delicate but distinct bristles. Sides of mesonotum lined with 
decumbent bristly hairs ; one pair of much reduced dorsocentral macro- 
chætæ. Abdomen bare, subopaque, with the second segment slightly 
elongated. Legs slender, thinly hairy. Anterior coxæ testaceous, their 
femora and tibiae brownish yellow and their tarsi fuscous ; middle legs 
piceous, lighter on the femora ; hind legs piceous. Halteres entirely 
black. Wings quite distinctly tinged with fuscous, venation blackish 
brown ; costal vein extending scarcely beyond the middle of the wing, 
very stout except at base ; fringed with short fine hairs ; first vein ending 
twice as far from the humeral cross-vein as from the tip of the third, 
and opposite the furcation of the third; second vein ending midway 
between the tips of the first and third. Fourth vein evenly but slightly 
curved, recurved at base and apex ; fifth vein distinctly sinuous, ending 
far from the fourth as in the European arcuata; sixth vein strongly 
sinuous ; seventh very distinct, nearly straight. 
A second female differs by its paler legs and pleuras, and fuscous 
thoracic dorsum. 
Type from San Bernardino, Paraguay, 1908 (Fiebrig), paratype 
from Paraguay (Fiebrig). 
The shining front with more distinct bristles and the black hal¬ 
teres are the most conspicuous characters distinguishing this species 
from the European G. arcuata Meig. 
