82 DIPTERA OP NORTH AMERICA. [PART III. 



and very little attenuated anteriorly ; viewed in profile, this gib- 

 bosity is less elevated than in the two preceding species ; on the 

 contrary, it is, to its very much protruding tip, almost on the 

 same level with the remaining portion of the front ; this causes 

 the anterior margin, which, with a slight convexity, is strongly 

 retreating, to lie almost entirely on the under side ; cheeks like- 

 wise broader and descending lower than in P. undata. The 

 coloring of the head is altogether pale-ferruginous, even the black 

 lines, bordering the middle portion of the face, are wanting. 

 The antennae likewise are altogether ferruginous-yellow ; the two 

 apical joints are almost of equal length ; the third appears a little 

 longer, only when viewed from the outside, along the lower 

 margin, because, at this point, this joint is less covered by the 

 second than above and on the inside ; the first two joints are 

 beset with blackish bristles, as in the two preceding species ; the 

 third joint is elongated-oval ; the arista is inserted in the middle 

 of its length, near the upper margin ; it is stout and very short, 

 shorter than the third antennal joint ; the second joint of the 

 arista is one-half longer than the first ; the styliform third joint 

 is but little longer than the first two taken together. Palpi 

 elongated, slightly curved, somewhat spoon-shaped at the tip, 

 pale ferruginous-yellow, with black bristles ; the proboscis brown. 

 Thorax uniformly ferruginous-yellow ; clothed, as the head, with 

 delicate black bristles. Abdomen of a similar color, but more 

 shining, beset with long black bristles, forming bunches, especi- 

 ally on the sides ; the upper side of the first abdominal segment 

 is infuscated beyond the middle. The horny capsule, which 

 forms the end of the fifth segment of the abdomen of the female, 

 has, in profile, the appearance of a sparrow's bill ; it is convex 

 above, concave below, obtuse at the tip and somewhat shorter 

 than the last three abdominal segments taken together. Feet 

 perceptibly longer and more slender than in the two preceding 

 species, with dense and rather long hairs, light brown ; the basal 

 third of the tibiae and the tarsi pale yellowish ; the hind tibia? 

 are much more incrassated toward the tip than the middle ones. 

 Wings remarkably broad, obtusely rounded at the apex ; the 

 second longitudinal vein strongly bent and then broken in the 

 shape of an angle, but without stump of a vein; ground color of 

 a saturate earth-brown ; a trapezoidal spot, extending from the 



