140 MB. E. E. AUSTEN ON NEW DIPTEROtJS INSECTS, [Jail. 17, 



separated in the median line. A distinct facial tubercle and 

 antenniferous process, the latter somewhat more pronounced in 

 the $ than in the d" • -^ lunate spot on each side of the antenni- 

 ferous process metallic violet. Antenna; orange-yellow ; third joint 

 oval ; arista brown, yellow at the base. Occiput black, whitish 

 pollinose, with a fringe of pale hairs. Thorax and scutdlum : in 

 (S metallic bronze-black, clothed with golden pile ; in $ metallic 

 blue-black, clothed with shorter whitish-yellow pile ; in the S a 

 sometimes obscure yellowish vertical stripe on the pleurae beneath 

 the suture ; in the $ , humeri and a similar vertical stripe on the 

 pleurae light yellow, the stripe with whitish pile. General colour 

 of the abdomen bronze-black, with yellow markings ; clothed with 

 erect and rather long yellowish pile on the sides of the first three 

 segments, and elsewhere with appressed pile, black on the black 

 and whitish on the yellow portions : the sides of the third and 

 fourth segments in the J are so curled round ventrally as to make 

 the abdomen at the tip appear not more than double the width of 

 the second segment at the base ; distal half of the abdomen of the 

 5 spatulate ; first segment reddish yellow, brown on the hind 

 margin, sometimes wholly brown or bronze-black in the S ; second 

 segment bronze in the c? , sometimes reddish on each side at the 

 base, with a more or less distinct reddish-yellow transverse band 

 on the second sixth from the hind margin ; hi some specimens the 

 second segment is wholly bronze-black in the cS , except the pos- 

 terior fifth, which is dull black ; second segment in the $ metallic 

 black, with a reddish-yellow band on the second fifth from the 

 hind margin, and sometimes reddish yellow at the base; third 

 segment in the cJ bronze on the basal and dull black on the apical 

 third, with a quadrate yellow spot on each side in the middle ; 

 third segment in the 5 metaUic black, with a yellow, somewhat 

 triangular spot on each side in the middle, the apices directed out- 

 wards, and the bases inclined one towards another and sometimes 

 narrowly meeting in the middle line in front ; the posterior side 

 of each triangle concave ; fourth segment in the S bronze-black, 

 with a quadrate yellow spot on each side at the base, occasionally 

 somewhat obscure, but \\hen distinct deeply emargiuate posteriorly, 

 so that each spot shows a sharp angle projecting backwards on 

 each side of the median line ; fourth segment in the $ metallic 

 black, with a yellow longitudinal stripe on each side of the median 

 line, starting "from the base and runniug the whole length of the 

 segment, and a broader yellow elongated spot starting from the 

 base of the yellow stripe on each side and running obliquely out- 

 wards, so as almost to cut off a basal angle ; in some specimens 

 the yellow longitudinal stripes become obsolete before reaching the 

 hind margin of the segment, and in others apparently do not run 

 more than halfway ; fifth segment in the d wholly metallic black ; 

 genitalia small, metallic black ; fifth segment in the $ metallic 

 black, with a somewhat confused repetition in miniature of the 

 yellow markings on the fourth segment. Legs yellow ; coxse 

 blackish brown, and a band on the outer half of the posterior 



