150 MR. E. E. AUSTEN OK NEW DIPTEEOUS INSECTS. [Jan. 17, 



Facial tubercle and oral margin pale orange, the remainder of 

 the face and cheels pale yellow, opalescent. Front clothed with 

 short dark pile, tawny pollinose, anterior face of antenniferous 

 projection shining : a smaller and fainter black spot in the median 

 line posteiiorly, near the apex of the angle formed by the eyes ; 

 ocelligerous tubercle black, clothed with short and rather stout 

 black hairs, which curye forwards. Antenna orange, short, third 

 joint blunt. Sides of the tJiora.v orange, didl, but becoming brassy 

 below ; two of the narrow leaden stripes are approximated in the 

 median line in front, and do not reach more than halfA\ay ; the 

 other two stri]3es, which are slightly broader, are lateral in position, 

 one (m each side, and extend almost to the hinder margin ; besides 

 these there is a faint indication of a lifth stripe, median in position, 

 starting from between the ends of the median stirpes, and running 

 to the hind margin of the dorsum ; metanotum greenish bronze ; 

 post -alar callosities orange, shining: the dorsum of the thorax 

 in front and the anterior portion of the pleurae are thinly 

 clothed with yellow pile, Mhich becomes more orange near the 

 base of the wings ; the dorsum near the transverse suture with 

 short brown pile. Smtellmn ochraceous, ^^•ith yellow pile below, and 

 dark brown pile round the margin. First segment of the abdomen 

 yellowish ochraceous, tumid and pale yello\\' at the sides ; the I'e- 

 niainder of the abdomen rufous ochi'aceous, with orange-ochraceous 

 markings; on the second segment these markings consist of a 

 narrow and ill-defined transverse band close to the hind margin, 

 and of a crescent-shaped band on the posterior half of the segment, 

 convex anteriorly, w idely se])arated in the middle line, and taper- 

 ing tow ards the posterior angles : the third and following segments 

 are marked by five continuous longitudinal stripes, of which that 

 in the median line is very narrow and not sharply deiined, while 

 the intermediate ones are much the broadest and most sharply 

 defined ; the stripes formed by the groiuid-colour on each side of 

 the median line are slightly broader than the intermediate orange- 

 ochraceous stripes, whih^ those between the latter and Ihe lateral 

 stripes are much broader than any of the light-coloured stripes ; 

 on the fifth segment the stripes converge posteriori}'. Genitalia 

 small, concealed. Lef/>i yellow, a band on the distal half of the pos- 

 terior femora, not reaching to the tip, and the distal half of the pos- 

 terior tibia^ pale brown. l\l.ni/f! imiformly suffused with pale sienna 

 colour ; the auxiliary and first longitudinal veins, and the bases of 

 the following ^eius as far as the fifth, pale orange : third longitu- 

 dinal vein rather abruptly convex forwards above the distal half 

 of the first posterior cell. 



Brazil, region of the Amazon (Bates) : one specimen. 



This species is apparently closely allied to BaccJta notaia, Lw. 

 (Dipt. Amer. Septent., Cent. vii. 65), from Cuba, and belongs to the 

 group of which Baccha livida, Schin. (Eeise ' ]S'o\ara,' 'M'.\), Baccha 

 {S;irplivs) Jiavijtennis, AVied. (Auss. zw. Ins. ii. 123), and Baccha 

 lineata, Macq. (Dipt. Exot. i. Suppl. 1.S9. t. 20. fig. 5\ are also 

 members. 



