AMERICAN DIPTERA. 319 



which are as wide as the intervittse ; intervittal bristles minute, sparse ; scutellum 

 with four bristles, the central pair widely separated ; six fine hairs in the meta- 

 pleural row. Abdomen slender, black, the male abdomen is shining above, ex- 

 cepting the first and half of the second segments, abdomen of the female sparsely 

 dusted ; hypopygium shining, black, terminal, not large, upper lamellae visible 

 one-third as large as the oblong middle lamellae, both densely hairy, central fila- 

 ment moderately slender, strongly arcuate, basal part exposed. Coxae cinereous, 

 trochanters black ; legs short, femora brown, piceous apically, hind ones reaching 

 the fifth abdominal segment, tibiae piceous, black apically, tarsi black; of the 

 male the hind femora are provided with a long sharp bristly projection just be- 

 yond the middle of the outer under side, between this and the tip of the femur 

 with a small median mammiform tubercle, the apical fourth of the outer under 

 edge is fringed with sparse bristles commencing in a dense pencil, the apical 

 eighth of the iuner under edge is provided with a dense fringe; the hind tibiae 

 of the male suddenly swollen near the knee to a flat prominence tipped with a 

 long black pencil, diagonally across from this is a swollen tubercle provided with 

 a black brush on its flattened top, the hiud tibiaj densely bristly ; hind metatarsi 

 thickened, and of the male the front ones likewise, the hiud ones of less diameter 

 than their tibiae, the front ones of greater diameter, tarsi densely spinose below. 

 Halteres yellow. Wings hyaline, with a faint cinereous tinge, stigmal spot elon- 

 gate, the furcation of the third vein slightly before the tip of the marginal cell, 

 the vein between the first basal and the discal cells shorter than that between 

 the second basal and the discal cells, and one-fourth the length of the second sec- 

 tion of the anterior border of the discal cell ; anal vein thin. 



Three males and two females ; Juliaetta and Peck, Idaho. From 

 Prof. J. M. Aldrich. 



Empis mira Bigot. 

 Enoplempis mira Bigot, Bull. Soc. ent. France, 1880, p. 47. 



Enoplempis Bigot. — Hind femora robust; below, at the tip, strongly armed and 

 unidentate, the tibiae below at the base similarly mucronate and unidentate, the 

 teeth with small hairs, thick. 



E. mira. Male. — -Fulvo-testaceous; the apex of the antennae, the proboscis 

 above, five vittae of the thorax, the lateral ones interrupted, fusco-canous; wings 

 yellowish. 6 mm. 



California. 



Einpis Bigoti nom. nov. 

 Enoplempis cinerea Bigot, Bull. Soc. Ent. Fr., 1882, p. 91. 



Cinereous, antennae fuscous; front cinereous; thorax with four castaneous 

 vittae; incisures of the abdomen fuscous; halteres testaceous ; trochanters infus- 

 cated ; legs fulvous ; femora, the apex of the tibiae and the tarsi fuscous, poste- 

 rior tibiae infuscated over all ; wings subhyaline, with a scarcely perceptible, 

 elongate, very slender fuscous stigma. 6 mm. 



California. 



In addition to this the generic characters may be added, as given 

 under E. mira Bigot. 



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



