SOUTH AMERICAN DIPTERA. 289 



90. Ceria Brauerii u. sp. 



9 . — Length 18 — 19 mm. Face black, shining, a lightly dusted stripe on each 

 side of the middle; a yellow stripe runs from uear the middle of the facial orbit 

 to the oral margin ; oral emargination broad ; an interrupted band below the 

 ocelli, and a spot on the upper part of the facial orbit, opaque black. Ocellar 

 callosity black, posterior orbits yellow pollinose. Frontal process slender, nearly 

 black, the underside red ; in length rather more than half of the first auteuual 

 joint. Antennae slender, the second joint only very gradually widened ; black, 

 the style silvery ; first joint a trifle longer than the second, the second longer 

 than the third, style not elongate. Thorax black, the dorsum with a distinct 

 yellowish pruiuosity, less apparent in the middle behind and near the outer end 

 of the suture ; a small spot on the humeri, a smaller one at outer end of suture, 

 the post-alar callosities and the narrow base and margin of the scutellum, red or 

 yellowish. Pleurse yellowish pruiuose; a rather broad yellow stripe across the 

 sides of metanotum ; an indistinct slender reddish stripe on the mesopleurse. 

 Abdomen ferruginous red ; second segment yellow at base, the fourth segment 

 with an indistinct, yellowish pollinose, biarcuate, cross-band ; in shape the abdo- 

 men is elongate, the third segment about square; the second segment is narrow 

 at the immediate base, of nearly the full width of the abdomen behind, of nearly 

 equal length with the third, shorter than the fourth. Legs brownish black, the 

 base of all the femora red or yellow. Wings hyaline, brownish along the ante- 

 rior part. 



Three specimens^ Chapada (March) and Santarem, The first seg- 

 ment of the abdomen may be blackish on the sides, and in life it is 

 possible that the following segments may have a noticeable yellow 

 hind margin. 



Dedicated to the able entomologist, Prof. Friedrich Brauer, of 

 Vienna. 



91. C'eria Roe«lerii n. sp. 



% . — Length 16 mm. Face and front black, shining, the narrow margin of 

 frontal orbit, and a slender stripe from in front of the lower border of the eye, 

 running to the oral margin, nearly white pollinose; on either side of the face, 

 below the antennse thinly grayish pollinose. Frontal process about one-third of 

 the length of the first antennal joint. Antennae, slender, black; second joint 

 only very gradually widened, about three-fourths the length of the first, and a 

 fourth longer than the third ; style very long and slender, cinereous. Vertex 

 not strongly prominent ; posterior orbits light yellow pollinose. Thorax black, 

 the mesonotum but little shining, with two conspicuous, opaque, light yellow, 

 pollinose stripes, blending with the base of a slender median triangle at the 

 scutellar margin ; a slender stripe on each side, nearly touching a narrow trans- 

 verse spot from the previously mentioned stripes, and running to the post-alar 

 callosity, of the same opaque yellow color. Pleurae gray pollinose. Scutellum 

 yellow, shining; metanotum light golden. Abdomen elongate, narrow, black 

 moderately shining; second segment yellow in front; second, third and fourth 

 with a posterior yellow margin, and a median, narrow (very narrow on the second), 



TKANS. AMEK. KNT. SOC. XV. (37) DECEMBEE, 1888. 



