ZooL.— Vol. II.] WHEELER— DOLICHOPODIDM. 45 



third joint with a curved black bristle near its proximal end. Fore femur 

 provided with a series of weak black cilia on its under surface. Wings gray- 

 ish hyaline, scarcely narrowed towards their bases. Third and fourth veins 

 parallel, the latter ending in the tip of the wing; distal segment of fifth vein 

 about three times the length of the posterior cross-vein. Halteres and teg- 

 ulse yellow, the latter bordered and ciliated with black. 



Two males taken in sweepings near Lusk, Wyoming, 

 August 14th and 26th, 1895. The colors are not well pre- 

 served. The species is closely related to P. lagotis, but 

 has the basal antennal joint entirely black. 



45. Parasyntormon emarginatum, sp. nov. 



Plate III, Fig. 75. 



Male. Length i.^^-i.^ mm.; length of wing 1.75-2 mm. Proboscis and 

 palpi piceous, with white hairs. Face narrow, covered with gray dust, more 

 white below. Antennae rather large, black; first joint subcylindrical, without 

 hairs, second joint overlapping the third on the inside with a large thumb- 

 shaped lobe; third joint broad, pilose, rapidly and acutely tapering at the 

 tip; insertion of the rather slender, slightly pubescent arista very decidedly 

 dorsal, being about one-fifth the length of the antenna behind the tip. On 

 the ventral side of the third joint, opposite the insertion of the arista, there is 

 a small but distinct notch. Postocular cilia short, pale below. Front dull 

 black. Thorax and scutellum rather shining dark metallic green, overlaid 

 with brown dust. Abdomen cupreous, ventral halves of second and third 

 segments yellow. Hypopygium black, shaped like thatof /*. asellus. Pleurae 

 dull blackish green, thickly covered with gray dust. Coxse yellow, basal half 

 of middle pair black. Legs yellow; tarsi from the tip of the first joint, tips 

 of hind femora and hind tibiae, black; fore femora with a series of conspicu- 

 ous black cilia on their lower surfaces; fore tarsi with two to four black 

 bristles on the lower surface of the first joint near the proximal end, second 

 joint distinctly incrassated especially towards its tip, third joint with a hook- 

 shaped bristle near the base on the inside. Wings grayish hyaline, scarcely 

 narrowed basally. Third and fourth veins parallel, the latter ending in the 

 tip of the wing. Distal segment of fifth vein about three times as long as 

 the posterior cross-vein. Halteres and tegulae yellow, the latter with black 

 edges and cilia. 



Female. Length 2.5 mm.; length of wing 2.5 mm. Palpi larger than 

 those of the male, face much broader, covered with light gray dust. Antennae 

 short, owing to the much smaller size of the third joint, which is pentagonal, 

 but little longer than broad, ending in a very blunt point, with dorsally 

 inserted arista; thumb-shaped overlapping lobe of the second joint shorter 

 than in the male. Coloration of the body and legs like that of the male. 

 Fore femora eciliate, fore tarsi plain. Wing somewhat broader at the base 

 than in the male. 



