98 
eye height, antennae nearly as long as the face, the third joint 
four times as long as the second, arista thickened on the basal 
third, the penultimate joint shorter than broad, facial ridges 
bristly on the basal fifth, thorax gray pollinose, marked with 
four black vitta\ scutellnm bearing four pairs of long marginal 
inacrochaetae, abdomen on the last three segments gray polli- 
nose. the hairs rather long and snberect ; wings hyaline, third 
vein bearing one or two bristles at its base, calypteres white; 
length. mm. White Mountains, New Hampshire, and Frank- 
ford, Pa. Two females, collected by Mrs. A. T. Slosson and 
Mr. C. W. Johnson. August 20, L895. Type No. 3596, 1". S. 
National Museum (implexa n. sp. 
17. Palpi and legs black, middle tibiae each bearing two or more macro- 
chaetae <>n the front side near the middle: front in the male 
three- fourths, in the female one and one-sixth times, as wide 
a- either eye; a dark brown reflecting spot below each of the 
lowest frontal bristles: third joint of antenna' in the male three 
and one half, in the female two and one fourth, times as long 
as the second; length.'.) to 11 mm. Sharon, Mass.; northern 
Illinois, < California, and < Oregon. ( Jan. Entomologist, Vol. XIX, 
p. 161; September. 1881: Tachina [Exorista], Parexoristd 
futilis ( ). S.. Brauer and Bergen s tarn m in litt.). . . .futilis O. S. 
Palpi yellow, mid. lie tibia- each bearing a single macrocha'ta on the 
front Bide near the middle, front in female three-fifths as wide 
ither eye. her third antenna! joint three and one half times 
as long as the second, no dark spots below the lowest frontal 
bristles; length.9 mm. Dist. Columbia. BiologiaCent.-Amer., 
Diptera, Vol. II. p. 74; February, L890.). griseomicans v. d. W. 
L8. Hind tibia- outwardly ciliate 19. 
Hind tibia- not ciliate. lour postsutural macrocha-ta-. middle tibiae 
each bearing two or more macrocha'ta- on the front side 
near the middle: black, the palpi yellow: front in male two- 
thirds as wide as either eye, the sides bearing numerous 
rather short hairs, no orbital bristles in the male, frontal bris- 
tles descending almost to apexof second antennal joint, cheeks 
one-sixth as wide as the eye height, facial ridges bristly on the 
lower half, antennas nearly as long as the face, the third joint 
four times as long as the second, arista thickened nearly to the 
middle, the penultimate joint slightly longer than broad; tho- 
rax gray pollinose, marked with four black vittae, scutellnm 
bearing lour pairs of marginal macrochaetae; abdomen whitish 
pollinose on bases of last three segments, its hairs subde- 
pressed; wings hyaline, third vein bearing three bristles near 
its base, bend of fourth append icul ate. apical cell short petio- 
late, calypteres white: length, C> mm. Virginia. A male speci- 
men. Type No. 3597, U. S. National Museum . .petiolata n. sp. 
