216 DIPTEBA. 



male genitals black. Legs black, the last pair of coxae slightly pulverulent at the base, 

 the knees slightly brownish-yellow, the tarsi dark brown and with their first joint but 

 slightly incrassate ; in the < male ' beset with long, soft, blackish hairs, the tip of the hind 

 tibia? bearing, on the underside, a small brush of very short, stiff bristles (which produces 

 the appearance of an incrassation), and the yellowish-brown first joint of the hind tarsi 

 having, on the underside, a similar brush of bristles at the base, followed by a distinct 

 emargination ; in the ' female ' the middle femora on the underside, the middle tibiae, 

 and the hind femora and tibise on both sides, beset with fringes of long, scale-like 

 hairs, and the hind tibise broadened and with a groove on the outside. Wings of the 

 male subhyaline, with a slight yellowish tinge in the subcostal cell, especially on the 

 stigma; in the female this yellowish tinge is more extended and occupies the whole 

 antero-proximal half; the venation as in E. diaphorina. One male, two females. 



N.B.— In the male the eyes are contiguous and the genitals projecting (I cannot see 

 the structure of the latter distinctly) ; the proboscis does not, in either sex, reach 

 beyond the thorax. 



3. Empis pegasus, sp. n., $ . 



Black, segments 1-4 of the abdomen ochraceous-yellow ; wings infuscated; all the legs fringed with scale- 

 like hairs. 

 Length 7 millim. 



Eab. Panama, Volcan de Chiriqui 2500 to 4000 feet (Champion). 



Female. Black; front moderately broad, opaque; face shining. Antenna? black; 

 third joint not longer than the first, triangular, slightly excised on the underside, the 

 arista as long, or a little longer. Thorax black, with a trace of three greyish stripes. 

 Abdomen with the four basal segments ochraceous-yellow, opaque, shining on the 

 incisures only ; the last segments black, shining. Legs dark brown, or black ; femora, 

 tibiae, and tarsi beset with broad fringes of scale-like hairs (on the anterior femora alone 

 the fringes are replaced by hairs) ; the four hinder femora and tibia? distinctly flattened. 

 Wings with a uniformly brown tinge ; branch of the third vein slightly oblique. A 

 single specimen. 



The species of Empidse hitherto described from Mexico (there are none from other 

 parts of Central America) are as follows : — 



Empis bicolor, Bellardi, Saggio &c. ii. p. 98. — Mexico, Cuantla. 



cyanea, Bellardi, 1. c. p. 98. 



spiloptera, Wiedem. Aussereur. zweifl. Ins. ii. p. 5 (syn. E. picta, Loew, 



Centur. iii. no. 28). 



suavis, Loew, Centur. viii. no. 56. 



■ totipennis, Bellardi, 1. c. p. 99. — Mexico, Morelia. 



violacea, Loew, Centur. viii. no. 55. 



Eybos dimidiatus, Bellardi, 1. c. p. 97. 



