1893.] MR. E. E. AUSTEN ON NEW DTPTEUOrS INSECTS. .155 



metallic yellow on the sides of the dorsum and on the pleurae, 

 metanotum and a faint pateli on each side above the middle coxfp 

 brown. /ScuteUum dull yellow. Ahdomen : 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 bind margin in the middle, but at 

 tlie sides is broader, reaches to the hind margin, and has a ragged 

 anterior edge ; fourth segment ^^ith 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 eacli posterior angle, occupying about one-third of 

 the length of the segment, brown ; the inner anterior angles of the 

 quadrate areas ai-e considerably prolonged, so that they run like a 

 sharp thorn into the 3'ellow 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 for\\ards 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 scntellum almost bare. Legs uniformly pale 

 yellow ; first joint of posterior tarsi slightly swollen. Winr/.i 

 rather narrow ; third longitudinal vein concave posteriorly; sub- 

 costal cell orange. 



Brazil, region of the Amazons (Bales) : one specimen. 



Baccha croca'xa, sp. n. (Plate Y. fig. 5, 2 ■) 



2 , Length Tt to 0,| mm. 



Sajfron-yelloiv ; abdomen with hrown hands ami indentations, 

 centre of dorsum of thorax shinint/ hrown, with yelloivish cinereoas 

 pollinose stripes : wings suffused with saffron-yellow, somen'hat 

 darker on the hasal half along the costal side ; alulce rudimentary : 

 leys ivholly yellow ; the posterior femora of the smallest specimen have 

 a narrow incomplete faint brownish hand towards the tip. 



Face and cheeks pale opalescent yellow, clothed Mith short pale 

 pile ; face tuberculate, receding. Front saffron -yellow, pollinose, 

 rather more than the posterior third cinereous-bronze polhnose, 

 from whicli a sharply defined brown mecUan stripe runs to thi' 

 base of the antenniferous projection ; in a smaller specimen ("5 mm. 

 in length) this stripe is broader and runs right over the anten- 

 niferous projection to the base of the antennae ; immediately 

 above the anteunte is a round black dot. Anteima; 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 scntellum, 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 bv the transverse suture ; the sides of the dorsum and 



