156 DIPTERA OF NORTH AMERICA. 



line ; transverse veins margined with blackish-brown. Long. corp. 0.9. 

 Long. al. 0.11. 



It has a certain resemblance with Philygr. femorata Stenh. and 

 interrupta Hal., namely, the form of its face is almost as in the 

 latter, and likewise more yellowish on the middle, whitish on the 

 lateral borders and towards the cheeks. Antennae blackish, ap- 

 pearing whitish-gray in certain directions, brownish on the inferior 

 border only, when held against the light. . Thorax grayish-brown, 

 on its anterior border dusted with whitish-gray; its darker stripes 

 are obsolete, but more visible in the neighborhood of the anterior 

 border, where they extend a little into the brighter gray color. 

 Scutellum as the upper side of the thorax. Pleurse gray. Ab- 

 domen grayish-black, more black towards the end, not glossy. 

 Legs black, tarsi yellowish-red as far as the fourth joint. Wings 

 grayish with a hyaline spot behind the posterior transverse vein 

 and with a rather clearer discoidal cell ; the clearer color of the 

 latter is only seen if the light shines through the wing and the 

 wing is looked at in an oblique direction, while the clear spot be- 

 hind the posterior transverse vein is distinctly seen in every direc- 

 tion. The two transverse veins have only a very narrow and 

 ill-defined dark margin, and the posterior transverse vein is a 

 little less distant from the posterior border of the wing than is 

 usual in this genus ; the second longitudinal vein being very long, 

 the second segment of the costal vein is more than twice as long 

 as the third. 



Hob. Middle States. (Osten-Sacken.) 



2. P. opposita LOEW. . (Translated from Berl. Entom. Zeitschr. 

 1861, p. 356, by R. Osten-Sacken.) Ex cinereo fusca, abdomine atro 

 m'tido, alarum venis longitudinalibus secunda, tertia et quarta nigro- 

 punctatis, venis transversis late nigro-limbatis. 



Cinereous-brown, abdomen black, shining, the second, third and fourth 

 longitudinal veins of the wings spotted with black, transverse veins 

 broadly clouded with black. Long. corp. 0.07 0.09. Long. al. 0.095. 



Cinereous-brown, opaque. Ocellar triangle large, concolorous, 

 rather indistinctly separated from the remainder of the front. Two 

 basal joints of the antennae black, the third black, with the bases 

 and the apical half impurely rufous. Face narrow, black, with a 



