SOME NEW EXOTIC PHORIDÆ. 
403 
is also much farther from the edge of the wing, and the front is pale 
yellow. 
Aphiochæta pauxilla n. sp. 
(Plate VIII. fig. 2.) 
Male. Length 1 mm. Black, including the antennæ and halteres. 
Palpi pale yellow; legs dusky testaceous, hind pair more or less piceous. 
Front about quadrate, sub-shining and faintly grayish pollinose ; four 
well-developed proclinate bristles, the two on each side close together 
but well separated from the pairs on the opposite side, the two lateral 
reclinate bristles of the lower row both very near to the lower corner 
of the front ; both middle row and ocellar row straight and regular ; ocellar 
tubercle well-developed and frontal groove distinctly impressed. Antennæ 
small, black, more distinctly ovate than usual, with an almost bare arista. 
Palpi rather large, with strong bristles. Postocular cilia stout, the cheeks 
below with a row of about five downwardly directed bristles. Dorsum of 
thorax subshining, with a single pair of dorsocentral macrochætæ. Scutellum 
twice as wide as long, with only two bristles. Abdomen small, black, the 
segments of equal length. Hypopygium rounded, the projecting lamella 
small. Legs short and robust, all the joints of the anterior tarsi enlarged; 
tarsi of other legs slender, the hind metatarsi not over one-half the length 
of the tibia. Posterior tibiæ with a row of fine setulæ on the hind margin 
toward the inner side where they are not very readily seen. Wings clear 
hyaline, the costal vein reaching to two-fifths the length of the wing, 
its cilia long and rather sparsely placed, there being only three between 
the tip of the first vein and the end of the costa, a distance equal to 
one-half the space between the humeral cross-vein and the tip of the 
first. First and third veins running close together and curving gradually 
to meet the costa, furcation of third very close to the tip ; second vein 
delicate and very weakly developed. Fourth vein slightly but evenly 
curved; others more nearly straight than usual. Halteres entirely black. 
One male. Argentine Bepublic: Lules, October 1905 (Vezényi). 
This is related to both A. jjygmaea Zett. and A. 'pusilla Meig. 
From the first it may be separated by the black halteres, longer costal 
vein and less approximated first and third longitudinal veins. From 
pusilla it differs by the less approximated first and third veins and 
more widely separated costal bristles, the distinctly flattened anterior 
tarsi do not occur in either of the two. It is undoubtedly a close re¬ 
lative of these two species of holarctic distribution. I think can be 
rendily distinguished by these characters aside from the wide geogra¬ 
phical separation. 
26 * 
