AMERICAN DIPTERA. 331 



last abdominal segment almost completely white-pollinose ; the preceding seg- 

 ments marked on each side with a white-pollinose spot, very large in the female, 

 hut smaller and not reaching the posterior margins of the segments in the male. 

 Hypopygium small ; the upper appendages changed from lamellse to small, swol- 

 len, ovate, dusky yellow, very short and very finely pubescent bodies; filament 

 concealed. Coxte dusky gray, yellowish towards apex; femora black, apically 

 badious, sometimes wholly badious, below marked with a large black spot; tibiae 

 testaceous, base often broadly badious; tarsi testaceous, last joint black. Hal- 

 teres whitish. Wings very pale cinerascent, veins fuscous. 5 mm. 



District of Columbia (Osteii Sacken). 



Pachyiueria brevis Loew. 

 Cent, ii, 22. 



Head black, cinereous with pale pollen, occiput black-pilose. Antennse black. 

 Dorsum of thorax cinereous with pale pollen, very faintly sub-vittate, provided 

 with rigid hairs and black macrochfetse. Scutellum concolorous with the thorax, 

 with four marginal black bristles. Pleurae black, cinereo-poUinose, and black- 

 pilose. Abdomen rather broad, sub-depressed, black, and black-pilose. Hypo- 

 pygium small, compressed, black, the lower lamellse ovate, the central filament 

 pale yellow, low, arcuate. Coxje black, cinereo-pollinose, black-pilose. Wings 

 cinerascent, veins fuscous. 4.2 mm. 



District of Columbia (Osten Sacken). 



ITEAPHIL.A Zetterstedt. 

 Small, blackish, rather thickly pubescent, EmpisUke species. 

 Antennae longer than the head, plainly three-jointed, basal joints 

 short, with erect hairs, last joint oval, bare, with a very short arista. 

 Proboscis as long (female) or longer than the head, rather thick, 

 horizontal, palpi lengthened. Eyes of male contiguous, of the 

 female widely separated. The male abdomen small, witii projecting 

 anal appendages. Legs slender, simple. Wings with the third vein 

 forked, the upper branch reaching straight to the costa ; discal cell 

 present, with three apical veins ; anal cell shorter than the second 

 basal, both bounded by a cross-vein almost parallel with the hind 

 margin ; anal angle strong. 



Iteaphila IVIaeqiiarti Zeterstedt. 

 Ins. Lapponica, 541, i. 



Black, or piceous. Thoracic dorsum indistinctly vittate. Halteres black. Legs 

 black with reddish knees. Wings brownish (male) or hyaline (female) with the 

 veins plainly bordered with brown. 4 mm. 



New Hampshire, Quebec. 



Iteaphila perigriiia sp. nov. (Fig. 97). 

 Length 3 mm. — Black, abdomen more or less piceous, feebly dusted and there- 

 fore sub-shining, provided with sparse, slender hairs; eyes of the male broadly 



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



