Diptera Jruiii Sunt ft A/n'ci. 175 



tlie two nnttiior pairs of let^s, Ix-.-iides tlio e at tlit* tip of tlu.* 

 tibiiv. 



In the two male spcciincii.s tluic arc no bristles on tlie tore 

 femora, but a few lon^ yellowish hairs, there are some black 

 bristles on the side of abdomen, the male organ is blackish 

 with short white pubescence, and the anal appendage bright 

 red. 



Alcimus longui-io^ Loew, Dipt. Siidafrik. p. 137 (1860). 



Two fcniales from Dmban [W. L. D.) are evidently the 

 female of the abi-ve. Loew described the male only. They 

 ditier from his description thus: — 



The thorax in one of the specimens has the median black 

 stripes very narrow, posteriorly merged in one broad black 

 stripe; in the other it is diviiled by only a narrow umber- 

 brown lini'. The fore tibia; and the aj)ical half of the posterior 

 ories, and the lirst joint of the lore and posterior tarsi, clothed 

 with short lulvous pubescence on the inner side; the basal 

 half ol the tarsal joints is dark red. The moustache extends 

 to theantennte, witli a few black bristles intermixed with some 

 long yellow hairs. The last segment of abdomen is wholly 

 black, shining. 



Alcimus tristi'i'i/dtiis, ^^ , Loew, Dipt. Siidafrik. ]). 134^, tab. i. 

 lig. 51 (l'«GO). 



One male from Pretoria (W. L. D.). 



The third joint of antennas, which was wanting in the 

 type, is black, and the bristle the same. 



Two females from Pretoria (IF. L. D.). 



Though these vary somewhat from the male, I feel con- 

 vinced they are the satne species, their general appearance 

 being identical. They differ from the description of the male 

 in the following particulars : — 



Antenna; wholly black, the moustache continued to the 

 antennse as a few scattered white hairs ; cheeks black; palpi 

 black, with yellow hairs. The middle stripe of thorax is 

 darker, the two narrow black lines on the side-ptrij)es of the 

 male here become respectively a triangular and an oblong 

 spot; the bristles on the j)Osterior ha!f are black instead of 

 yellow ; the hairs on the scutellum are all yellow. On the 

 abdomen the dark pj)ots become a broad band on each segment, 

 not reaching to the posterior margin ; the last segment is 

 wholly black, shining; the mibescence on the bands is 

 yellowish, giving them a fulvous aj)j)earance, elsewjiere 

 whitish. Legs black, the tibia; on basal half reddish ; the 



