1893. j Mil. ^. Jbi. -vu.STEy ox xiaw jdiptbroijs ixsicoxs, 159 



straight; terminal section of fourth vein^ closing first posterior cell, 

 very upriijJtt. 



Santareni, R. Tapajos, Brazil {Bates) : oue specimen. 



Ascia striata, Wlk., Dipt. 8auiid. 221, from Brazil, is not an 

 Ascia : it must be placed in a new genus closely allied to Baccha, 

 \\liich it resembles iu e^'ery particular except the terminal section 

 of the fourth vein, closing the tirst posterior cell, which is straight 

 and perpendicular. 



Baccha tripartila was described by AVallcer, Joiirn. Linn, Soc. 

 V. 2So, from Batcliian, the typical specimen being a (5 . Subse- 

 quently (Journ. Linn, Soc. vii. 212) A\^alker mentioned a second 

 specimen from Mysol. There is only oue s])ecimen in the 

 collection, a S from Mysol. This is labelled " trijMriita " in 

 Walker's handwriting, and may really be the type, as the Mysol 

 label may have been attached in mistake for a Batchiau one. The 

 specimen agrees \\ith the description. 



Baccha Oispar, AVlk., Journ. Linn. Soc. iii. 121, from Macassar, 

 Celebes ; length of the type (a (j' ) 12^ mm. 



Baccha hasalif, AVlk., Journ. Linn. Soc, v, 239, from Dorey, 

 Xew Guinea: A\''alker writes "hind tibi» with a piceous sub- 

 apical band ; '" there is only the faintest trace of such a baud on the 

 tibiae, but a ^^•ell-marked one on the hind femora, which are 

 probably what A\''alker was looking at. 



Baccha purparicola, AVlk., Journ. Linn, Soc, iv. 129, from Key I., 

 Aru Is. : length of body 6 lines (not 5^ as stated by A\^alker) ; length 

 of each wing 5 lines. 



Si/rphus suhchah/heus, AVlk., Tr. Ent. Soc. n. scr. iv. 157, from 

 the A'alley of the Amazon, is a Baccha belonging to Group IJ. 



Faragus ? sciiii'Jlari^, AVlk., Trans. Linn. Soc. xvii. 342, froju 

 Sao Paulo, Brazil ; Baccha habista, AVlk., List. Dij^t. iii, 540, from 



Georgia ; and Baccha varia, AVlk., List, Dipt, iii, 548, from , 



are all synonyms of Baccha clavata, F. 



S.vLPiXGOGASTEK, Schin. 



S.VLPINGOGASTKE YIRGATA, sp. U. (Plate \. Hg. 3, cS •) 



c? 2 • Length 14J -17| mm. 



Thorax pale yellow ; the dorsum, except tlie lateral margins, 

 dark brownish, with a cinereous polli]iose strij)e on each side of 

 Ihe median line, and a faint bronze stripe close to the yellow 

 margin on each side ; the pleura' v.'ith a narroiv hroivn stripe ruanimj 

 from the hase of the n-iivi to the mi'hlle coxa, and a sometimes 

 broader but inter rv. pled, and abbreviated stripe on each side of the 

 metanotum; metanotum metallic dark brown; scntellam yellow, 

 with a sharply defined central area tlark brown ; abdomen ferru- 

 ginous, that of the J endijig in a minute spine, and w ith processes 

 beneath the fourth segment ; vjia(/s with a faint ochraccous tinge, 

 darker along the fore-border ; alahe rudimentary ; k(/s ochre- 

 yellow, the distal portion of the posterior femora, a fainter and 

 narrower band on the middle of the posterior tibia>, and the 



