SOUTH AMERICAN DIPTERA, 287 



5. Dorsum of thorax with conspicuous light yellow pollinose stripes ; abdomen 



banded ; middle tibije of male with a distal brush of hair. 



Roederii n. sp. 

 Dorsum of thorax and the abdomen uniformly black 6. 



6. Middle male tibite with brush of hair on inner distal part; abdomen elongate 



ovate ; face with two inconspicuous luteous stripes barbipes Loew. 



Middle male tibiae simple 7. 



7. Face with four slender yellowish or whitish stripes; sides of metanotum with 



slender yellow stripe ; wings in front deep brown, towards tbe end yellow. 



Wulpii n. sp. 



Face with two stripes, no metathoracic stripes, wings more uniform along the 



front border; second segment of abdomen more cylindrical, not so much 



dilated distally Bigotii n. sp. 



87. Ceria liynchii u. sp. 



% . — Length 15 mm. Face yellow, a median stripe, a vittula on each side, and 

 a stripe from the lowest part of the eye to oral margin, ferruginous red ; vertex 

 reddish yellow, the lateral orbits golden pollinose ; occiput in the middle broadly 

 black. Frontal process long and slender, longer than the first joint of the an- 

 tennae, red. First joint of the anteniiie black, a little longer than the second; 

 second joint black, or brownish black, a little longer than the third; third 

 wholly red ; style elongate, slender, white. Mesonotum red ; on the posterior 

 half a very large triangle, its apex in front and with a slender brown streak in 

 its middle, a stripe on each side from the suture to post-alar callosity, a triangular 

 spot on each side in front of the suture, contiguous with a spot on the humeri, 

 yellow; just above the supi-a-alar yellow stripe, an equal black one; on each side 

 of the middle a golden pollinose stripe, reaching about as far as the apex of the 

 posterior triangle. Pleurae chiefly yellow, with four or five slender, vertical 

 blackish or brown stripes. Scutellum light yellow, the base very narrowly black ; 

 metanotum light yellowish gray pollinose. Abdomen not broad, deep ferrugin- 

 ous in color, the first segment with a posterior black band, the second more yel- 

 lowish on the sides in front; the second segment is longer than tbe third, and 

 about as long as tbe fourth, it is much contracted near the anterior end, but not 

 cylindrical, its posterior side broad, nearly the full width of the abdomen. Legs 

 yellowish red, the basal two-thirds of the femora black, but with reddish streaks. 

 Wings brownish yellow along the front margin ; the basal posterior part al.so 

 tinged with the same color. 



One specimen, Chapada, June. Dedicated to Dr. Enrique Lynch 

 Arribalzaga, of Argentina. 



88. Ceria Sackenii n. sp. 



'J,.— Length 14 — 15 mm. Face black, lightly dusted; a broad, somewhat 

 triangular, stripe on each side, nearly confluent above with a large orbital spot 

 and a spot on each side of the anteunal process, confluent with the frontal orbital 

 margin, yellow; cheeks black, shining behind, the posterior oral margin with a 

 yellow spot. Vertex swollen, yellow ; the posterior orbits golden yellow pollinose. 

 Frontal process reddish yellow, or yellowish red, about half the length of the 

 first autennal joint. Antennae blackish brown ; the first joint at base, the distal 



