AMERICAN DIPTERA. 309 



34. P. varius n. sp. 



cf. Similar to tarsalis. Front brownish ; face silvery or with yel- 

 low tinge, occiput faintly grayish to brownish. Antennae with third 

 joint yellow, short, acute (Fig. 19). Mesonotum and scutellum some- 

 what shining, brownish tinged ; pleura? and metanotum hardly tinged 

 with gray ; humeri black and halteres brown or yellowish. Abdomen 

 ovate, polished, with two white spots on first segment ; fifth about one 

 and one-half as long as fourth. Hypopygium subopake, brownish, little 

 shorter than fifth and much narrower, assymetrical, and cleft; inter- 

 mediate lobe just visible; ventral lobe black (Fig. 63). Legs slender, 

 pale yellow, with black femoral rings; distinctly spiuose ; apical and 

 basal post-tarsal joints in proportion 1:2; claws smaller than joint. 

 Wings gray or brownish with faintly colored stigma (Figs. 148-149). 

 Length, 3.2 mm. ; wings, 3.8 mm. 



Type— Harrisburg, Pa., August 8 (Figs. 19, 63, 148, Walton, 

 coll. Banks). 



Paratype. — One specimen from same locality (Fig. 149). 



The similarity between this species and tarsalis is evi- 

 dent, but the black humeri, short antennae and lighter legs 

 will distinguish this one. 



35. P. tarsalis Banks, n. sp. 



" o". In the second group with dark stigma, and shining abdomen, 

 but the last joint of antennae is elongate, acute, and white. The face 

 is silvery, also occiput ; the arista of antennae is very distinctly swollen 

 at base ; the thorax black, with yellowish humeri ; the abdomen is short 

 and broad, shining black, the first segment hoary; the legs are black, 

 the apex of femur, basal part of tibia and part of tarsus pale, the basal 

 joint of tarsus is brownish, and last joint black, the claws are very 

 short. The wings are gray [Fig. 165], the veins and stigma black; 

 the small cross-vein is before end of first third of cell, but as far out 

 as end of auxiliary vein ; the third and fourth longitudinal veins are 

 farther apart at tip than usual. The last segment of male abdomen 

 is small, and with slight cleft on right side; the fourth ventral seg- 

 ment has a conical process at tip. Length, 3.0 mm. ; wings, 3.5 mm." 



Type.— Ithaca N. Y., July {coll. Banks). 



I make the following observations : Front silvery ; an- 

 tennal third joint yellow, long white acuminate (Fig. 9). 

 Mesonotum and scutellum subopake ; halteres with black 

 knobs ; pleurae, metanotum, and ventral margins of abdomen 

 tinged with gray. All segments subequal in length ; hypopy- 

 gium small, subopake, as long as fifth segment, and much 

 narrower ; terminal lobe seems to be without cleft, but has 



TRANS. AM. ENT. SOC, XXXVI. JANUARY, 1911 



