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Show 1893.] ME. U. E. AUSTEN ON NEW DIPTEROUS INSECTS. 159 straight; terminal section of fourth vein, closing first posterior very upright. Santarem, R. Tapajos, Brazil (Bates): one specimen. Ascia striata, Wlk., Dipt. Saund. 221, from Brazil, is not an Ascia : it must be placed in a new genus closely allied to Baccha, which it resembles in every particular except the terminal section of the fourth vein, closing the first posterior cell, which is straight and perpendicular. Baccha tripartita was described by Walker, Journ. Linn. Soc. v. 285, from Batcbiau, the typical specimen being a d • Subsequently (Journ. Linn. Soc. vii. 212) Walker mentioned a second specimen from Mysol. There is only one specimen in the collection, a d from Mysol. This is labelled " tripartita" in Walker's handwriting, and may really be the type, as the Mysol label may have been attached in mistake for a Batchian one. The specimen agrees with the description. Baccha dispar, Wlk., Journ. Linn. Soc. iii. 121, from Macassar, Celebes ; length of the type ( a d ) 12^ m m . Baccha basalis, Wlk., Journ. Linn. Soc. v. 239, from Dorey, N e w Guinea: Walker writes "hind tibiae with a piceous subapical band ; " there is only the faintest trace of such a band on the tibia?, but a well-marked one on the hind femora, which are probably what Walker was looking at. Baccha purpuricola, Wlk., Journ. Linn. Soc. iv. 129, from Key I., Aru Is.: length of body 6 lines (not 5| as stated by Walker); length of each wing 5 lines. Syrphus subchalybeus, Wlk., Tr. Ent. Soc. n. ser. iv. 157, from the Valley of the Amazon, is a Baccha belonging to Group If. Paragus ? scutellaris, Wlk., Trans. Linn. Soc. xvii. 342, from Sao Paulo, Brazil; Baccha babista, Wlk., List. Dipt. iii. 549, from Georgia; and Baccha varia, Wlk., List. Dipt. iii. 548, from , are all synonyms of Baccha clavata, F. SALPINGOGASTEE, Schin. SALPINGOGASTEE VIEGATA, sp. n. (Plate V. fig. 3, d •) d 2 • Length 14|-17^ m m . Thorax pale yellow ; the dorsum, except the lateral margins, dark brownish, with a cinereous pollinose stripe on each side of the median line, and a faint bronze stripe close to the yellow margin on each side ; the pleurce with a narrow brown stripe running from the base of the wing to the middle coxa, and a sometimes broader but interrupted and abbreviated stripe on each side of metanotum ; metanotum metallic dark brown; scutellum yellow, with a sharply defined central area dark brown; abdomen ferruginous, that of the d ending in a minute spine, and with processes beneath the fourth segment; wings with a faint ochraceous tinge, darker along the fore-border; cdulos rudimentary; legs ochre-yellow, the distal portion of the posterior femora, a fainter and narrower band on the middle of the posterior tibia?, and the |
