AMERICAN DIPTERA. 301 



than the head. Palpi yellow. First two joints of the antennse yellowish brown, 

 the third Joint black, long, strongly attenuate from the broad base, the terminal 

 style long. Thorax opaque, a single fuscous vitta, abbreviated from each side 

 and sometimes obsolete. Abdomen shining, fuscous, the side and hind margins 

 of each segment yellow. Venter yellow. Hypopygium small; porrect, the mid- 

 dle and lower lamellse yellow ; the central filament almost concealed. Legs long, 

 slender, yellow, the tarsi from the apex of the first joint almost black ; the poste- 

 rior legs with the femora armed with some very obtuse spines, a part large and 

 black-pilose, the others smaller and bare. Halteres yellow. Wings long, brown- 

 ish gray, the faint stigma a little more brown, veins fuscous. 



i^em&Ze.— Very much like the male; the posterior legs simple; the pile of the 

 tibiae and tarsi shorter and sparser than in the male. 5 mm. 



New York, 



Empis tridentata Coquillett (Fig. 132). 

 Proc. U. S. Nat. Mus., vol. xxiii, p. 609. 



Head black, gray prninose, front of male at narrowest point less than the 

 width of the lowest ocellus; antennae black, the first two joints yellow, the third 

 slightly over four times as long as wide, gradually tapering to the apex, nearly 

 four times as long as the style, palpi and proboscis yellow, the latter almost twice 

 as long as the height of the head; thorax yellow, a large black, gray pruinose 

 spot in the middle of the hind part of the mesonotum; sending three prongs 

 toward the head, the median one subopaque, the lateral ones polished, three 

 small black spots beneath the insertion of each wing, and a fourth bordering the 

 mesothoracic spiracle and prolonged backward almost to the wing, hairs and 

 bristles of thorax black, scutellum yellow, the base of the middle black, bearing 

 four bristles; abdomen polished, yellow, bases of segments two to four or five 

 usually black, most extended in the female, central filament of male hypopygium 

 very sinuose; legs yellow, apices of tarsi brown, middle and hind femora beset 

 with spinous bristles on the under side; wings hyaline, stigma brown, a brown 

 cloud on the base of upper branch of third vein, another on vein at base of sec- 

 ond posterior cell, and one above forking of second and third veins. 6 mm. 



Pennsylvania (C. W. Johnson). 



Empis pallida Loew. 

 Cent, i, 30. 



il/a/e.— Wholly yellow. Head concolOrous. Eyes separated. Proboscis much 

 longer than the head. Antennae long, slender, first two joints yellow, third, ex- 

 cept the base, black, with a slender terminal style. Thorax opaque, sparsely 

 black-pilose. Abdomen shining, covered with rather long yellowish pile. Hypo- 

 pygium small, clavate, the median lamellae oblong-ovate, ascending, with short 

 pile. Coxae yellow, with black pile. Legs long, slender, yellow, with black 

 pile; last joint of the tarsi wholly, the others apically black. Halteres yellow. 

 Wiugs large, hyaline, pale cinerascent, with a yellowish tinge, stigma pale yel- 

 low, almost wanting, veins yellow. 4 mm. 



New York (Edwards). 



TRANS. AM. ENT. SOC, XXVIII. AUGUST, 1902 



