1893.] MR. E. E. AUSXEN OS NEW DIPTEROUS liS'SECTS. 145 



yellow, pectus aud metauotum metallic black. Scutellum brownish 

 yellow. Ahdomen : the anterior margin and sides of the first 

 segment pale yellow ; on the second segment a narrow transverse 

 band, slightly notched in the median line behind and situated just 

 beyond the middle of the segment ; tliird segment M'ith a cres- 

 centic band in the middle, narrowly interrupted in the median line, 

 concave posteriorly, and nearly three times as broad as the band 

 on the second segment ; the sagittate marlvings ai'e situate on the 

 anterior lialf of the fourth segment, and directed anteriorly, they 

 are narro\\"ly separated in the median line and are truncated in 

 front by the hind margin of the preceding segment ; on the fifth 

 segment the yellow markings consist of deeply notched bases of 

 arrow-heads, situated one on eacli side of the anterior half of the 

 segment, the whole of the remainder of the arrow-heads being, as 

 it were, hidden beneath the fourth segment ; the inner angles of 

 the bases of the arrow-heads are longer than the onter, and the 

 notches are very much larger than in the case of the arrow-heads 

 on the previous segment ; sixth segment wholly purplish black : 

 tlie markings on the foiu'th and fifth segments are of a deeper 

 yellow than the others. Ler/s yellow ; the posterior femora and 

 tibitC each with two brown bands, the band near the base of the 

 femur being more diffuse aud less distinct than the others ; similar 

 bauds are faintly indicated on the middle legs. Winjs with a 

 brownish tinge, which becomes concentrated at the tips ; distal 

 half of subcostal cell brown ; third longitudinal vein straight ; 

 distal portion of fourth vein, closing first posterior cell, short, 

 upright. 



Cinchona, Jamaica ; June ( W. FaivceU, Esq.) : one specimen. 



This species of Bacclut is distinguished from any other known 

 to me, by the shape of the conspicuous yellow markings of the 

 abdomen. 



Baccha siGyiFEK,\ , sp. u. (Plate IV. fig. S, S •) 



c^ . Length 114 mm. 



Face and clieels metallic blue-black, with black p\le ; face 

 narrowly shimmering Avhite on the sides above ; facial tubercle 

 sharply defiiied, conical ; front (including the large antenni- 

 ferous projection) metallic black, with a dull black quadrate 

 median area beliind. The first two joints of the antennce 

 black ; the third brown ; the arista brown. Thora.v dull velvety 

 black on the dorsum, with three stripes on each side of the median 

 line metallic blaclv ; the innermost stripe on each side is very 

 narrow and tapering, and docis not reach much more than half- 

 way ; the intermediate stripe is broader, and also tapers, but fuses 

 ])Osteriorly with tlie lateral stripe, which is vi'ry broad indeed, and 

 extends to the scutellum; the two outside stripes are divided by 

 the transverse suture ; the lateral stripe includes the post-alar 

 callosity ; /deiirc; metallic bronze -black. Sculcllum. metallic 

 black ; thorax and scutellum clothed with short black pile. 

 Abdomen dull velvety black, luith yellow dots and metallic bands ; 



Paoc. ZooL. Soc.— 1893, No. X. 10 



