AMERICAN DIPTERA. 305 



the length of the first, lanceolate, its arista one-thiid its length ; eyes separated 

 a little more widely than the posterior ocelli in the male, and a little more iu 

 the female; bristles of the occiput irregularly placed. The intervittal bristles of 

 the thorax minute, the marginal macrochsetfe short, no long humeral niacro- 

 chaeta ; scutelliim with two long and two short marginal bristles; three or four 

 bristles in the vertical row in front of the halteres; bristles of the pronotal collar 

 minute, no pectal bristles present. Abdomen dull grayish, with a piceous tinge, 

 wholly opaque, the hind margins of the segments cinereous; hypopygium mod- 

 erate in size, closed, central filament rather stout, nearly straight on the exposed 

 basal part, fuscous, shining, middle lamellae concealing the remainder of the 

 hypopygium, dark fuscous. Legs stout, dark fuscous, including the coxae, tarsi 

 blackish; coxae sparsely black-bristly, more evidently bristly in front; tip of 

 trochanter and of femora narrowly black ; hind femora slightly bowed on the 

 proximal third; hind trochanters of the male widened within and produced as 

 a prominent tubercle, which is capped by a dense pencil of black bristles, remain- 

 der of the legs without sexual armament; hind femora not reaching the end of 

 the abdomen, as long as or shorter than their tibiae ; front metatarsi of the male 

 a little stouter than those of the female, tarsi densely spinose beneath ; bristles 

 of the legs prominent, especially in the male, pubescence not marked. Halteres 

 reddish yellow. Wings hyaline, with a faint brown tinge, veins fuscous, stigma 

 obsolete, third vein furcate opposite the end of the marginal cell, the posterior 

 branch terminates at the wing apex ; discal cell moderate, the first section of its 

 fore margin one-fifth the length of the second section, no prominent costal bristle. 



Numerous specimens from Ohio (J. S. Hine), and Alabama {C. 

 F. Baker). 



Einpis nuda Loew (Fig. 126). 

 Cent. ii. 20. 



31nle. — Pale cinereous, opaque, almost glabrous. Eyes distant. Antennae elon- 

 gate, slender, black. Proboscis moderate. Thoracic dorsum almost bare, with 

 very sparse black bristles and four fuscous vittae, the middle vittae abbreviated 

 posteriorly, the outer on both sides. Pleurae cinereous, bare, except for two black 

 bristles in front of the halteres. Abdomen fusco-cinereous, the hind margins of 

 each segment grayish white. Hypopygium small, yellowish, with sparse black 

 pile, the lamellae oblong-ovate, the base of the central filament very thick, the 

 apex hidden. Coxae pale yellow, the anterior bare, except for a few apical setae. 

 Legs slender, darker yellow ; the tarsi and a very narrow apical ring on the hind 

 femora almost black, the base of the tarsi and the apex of the tibite paler fus- 

 cous; the hind trochanters armed with small black spines below; the black pile 

 of the femora very short, of the middle tibiae longer, of the hind tibiae long above. 

 Wings cinerascent, the obsolete stigma pale subfuscous, veins strong fuscous. 

 6 mm. 



Illinois (Le Baron). 



The following remarks, based on further specimens also from 

 Illinois, may be of service in the identification of this species. 



Eyes separted in the case of the male as widely as the width of 

 the anterior ocellus. The occipital bristles short, arranged in two 



TEANS. AM. ENT. SOC, XXVIII. (39) SEPTEMBER, 1902. 



