| OCR Text |
Show 1893.] ME. E. E. AUSTEN ON NEW DIPTEEOUS INSECTS. 155 metallic yellow on the sides of the dorsum and on the pleurae, metanotum and a faint patch on each side above the middle coxa? brown. Scutellum dull yellow. Abdomen : second segment with a narrow, posteriorly concave, pale brown transverse band near the hind margin ; third segment with a brown transverse band which is very narrow and close to the hind margin in the middle, but at the sides is broader, reaches to the hind margin, and has a ragged anterior edge ; fourth segment with the extreme hind margin, a small median posterior triangle prolonged into a faint median line which almost reaches to the anterior margin of the segment, and a quadrate area in each posterior angle, occupying about one-third of the length of the segment, brown ; the inner anterior angles of the quadrate areas are considerably prolonged, so that they run like a sharp thorn into the yellow portion of the segment on each side ; fifth segment nearly wholly yellow, a narrow median stripe starting from the anterior margin of the segment, but becoming obsolete about halfway, and an ill-defined patch in each posterior angle, from which a faint and almost obsolete streak runs forwards and slightly inwards, faintly brown ; genitalia brown at the tip : the abdomen is clothed with very short and sparse appressed black pile ; the thorax and scutellum almost bare. Legs uniformly pale yellow; first joint of posterior tarsi slightly swollen. Wings rather narrow7; third longitudinal vein concave posteriorly ; subcostal cell orange. Brazil, region of the Amazons (Bates): one specimen. BACCHA CEOCATA, sp. n. (Plate V. fig. 5, $ .) 2 . Length 1\ to 9| m m. Saffron-yellow; abdomen with brown bands and indentations, centre of dorsum of thorax shining brown, with yellowish cinereous pollinose stripes: wings suffused with saffron-yellow, somewhat darker on the basal half along the costal side ; alulce rudimentary legs wholly yellow ; the posterior femora of the smallest specimen a narrow incomplete faint brownish band towards the tip. Face and cheeks pale opalescent yellow, clothed with short pale pile ; face tuberculate, receding. Front saffron-yellow, pollinose, rather more than the posterior third cinereous-bronze pollinose, from which a sharply defined brown median stripe runs to the base of the antenniferous projection ; in a smaller specimen (7| m m . in length) this stripe is broader and runs right over the antenniferous projection to the base of the antennae; immediately above the antenna? is a round black dot. Antennce orange, short, third joint rounded, arista brown, yellow at the base ; ocelli remote from the vertex. Occiput fringed with golden-yellow hairs. The pollinose stripes of the dorsum of the thorax consist of a very fine median one, and a much broader stripe on either side of this ; all three are abbreviated before reaching the scutellum, but the median one is somewhat the longer ; the brown stripe outside each lateral pollinose one is the broadest and darkest of all, and is divided by the transverse suture; the sides of the dorsum and |
