1893. J JIU. B. E. AUSTEN' OS SEW BIP'JCEEOTTS I\SECTS. 159 



straight; terminal section of fourtJi vein, closing first posterior cell, 

 very uprii/ht. 



Santarem, R. Tapajos, Brazil (Bates) : oue specimen. 



Ascia striata, Wlk., Dipt. Saimd. 221, from Brazil, is not au 

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

 which it resembles in every particular except the terminal section 

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

 aad perpendicular. 



Baecha tripartita was described by Walker, Journ. Linn. Soc. 

 V. 285, from Batchiau, tlie typical specimen being a c? . Subse- 

 quently (Journ. Liun. Soc. vii. 21:2} Walker mentioned a second 

 specimen from Mysol. Tliere is only oue specimen in the 

 collection, a c? from Mysol. This is labelled " tripartita " in 

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

 label may have l^een attached in mistake for a Batchian one. The 

 specimen agrees \\ ith the description. 



Baecha dispar, Wlk., Journ. Linn. Soc. iii. 121, from Macassar, 

 Celebes ; length of the type (a J ) l2o mm. 



Baecha hasalii^, Wlk., Journ. Linn. Soc. v. 239, from Dorey, 

 New Guinea : Wallcer writes " hind tibise with a piceous sub- 

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

 tibise, but a w^ell-marked one on the hind femora, which are 

 probably Avhat Walker was looking at. 



Baecha pwpuricola, AVlk., Journ. Lijin. Soc. iv. 129, from Key I., 

 Aru Is. : length of body 6 lines (not 5| as stated by Walker) ; lengtli 

 of each wing 5 lines. 



Syrphus suhchah/heus, Wlk., Tr. Ent. Soc. n. ser. iv. 157, from 

 the Valley of the Amazon, is a Baecha belouging to Group IT. 



Parac/us ? Scutellaria, Wlk., Traus. Linn. Soc. xvii. 342, from 

 Sao Paulo, Brazil ; Baecha hahista, Wlk., List. Dipt. iii. 549, from 



Georgia ; and Baeeha varia, Wlk., List. Dipt. iii. 548, from , 



are all synonyms of Baecha clavata, F. 



Salpingogastee, Schin. 

 Salpikgogasteb tirgata, sp. n. (Plate Y. fig. 3, S •) 



<S 2 . Length 14^-17| mm. 



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

 dark brownish, with a cinereous poUinose stripe on each side of 

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

 margin on each side ; the pleura; with a narroiv broivn stripe running 

 from the luise of the wing to the middle coxa, and a sometimes 

 broader hut interrupted and abbreviated stripe on each side of the 

 inetanotum ; metanotum metallic dark bro\Mi ; scutellum yellow, 

 with a sharply defined central area dark broM'ii ; abdomen ferru- 

 ginous, that of the S ending in a minute spine, and ^A-ith processes 

 beneath the fourth segment ; icings with a faint ochraceous tinge, 

 darker along the fore-border ; alulai rudimentary ; legs ochre- 

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

 narrower band on the middle of the posterior tibite, and the 



