130 BULLETIN 11(5, UKITED STATES N'ATIOXAL MUSEUM. 



Middle and hind femora each with one preapical bristle, the latter 

 nearly bare below. Anterior tibiae (fig. 84) fringed for their entire 

 length on upper edge with very long black hairs which are as long 

 as the basitarsi; outside of these hairs is a bare stripe the whole, length 

 of the tibiae; below at basal third there is a delicate black bristle. 

 Middle tibiae with a row of about nine bristles on the lower edge of 

 the apical half; posterior pair narrowly black at tip, not thickened. 

 Fore and middle tarsi yellowish brown at base, becoming black 

 from the tip of the first joint, one and a fourth times as long as their 

 tibiae, the former with fourth and fifth joints of equal length. Hind 

 tarsi wholly black, their basitarsi with one large bristle above. 

 Calypters and halteres yellow, the former with pale cilia. 



Wings grayish, slightly tinged with brown in front and along the 

 cross vein; costa scarcely enlarged at tip of first vein; last section 

 of fourth vein considerably bent at middle; hind margin of wing a 

 little indented at tip of fifth vein; anal angle rounded so as to make 

 the wing narrow at base. 



Female. — Face nearly as wide as the front, silvery white; antennae 

 only a little shorter than those of the male; fore coxae with little 

 black hairs on their anterior surface; tibiae with their bristles and 

 hairs normal, middle pair with two or tliree bristles below, their basi- 

 tarsi without a bristle above; hind basitarsi with one bristle above; 

 the cilia of the calypters appear black in some lights and yellowish 

 or whitish in others. I do not see this change of color in any of the 

 males before me. These cilia are rather short and not very abundant 

 in either sex. 



Described from 7 males and 3 females taken by J. M. iVldrich, at 

 Wells, Nevada, July 12, 1911. 



The name for this species was proposed by Prof. J. M. Aldrich 

 and is very appropriate, the long hairs on the fore tibiae and the 

 bristles on the lower surface on middle tibiae being quite remarkable. 



Type.— Male, Cat. No. 23018, U.S.N.M. 



No. 85. DOLICHOPUS BREVIPENNIS Meigen. 



DoKchopus hrevipennis Meigen, Syst. Beschr., vol. 4, 1824, p. 89. — Loew, Mon. 

 N. Amer. Dipt., pt. 2, 1864, p. 37. — Aldrich, Kansas Univ. Quart., vol. 2, 

 1893, p. 10, pi. 1, fig. 6.— Lundbeck, Diptera Danica, pt. 4, 1916, p. 144, 

 fig. 45. 



Male. — -Length 5.5 mm.; of wing 4.5 mm. Face rather wide, 

 ocher yellow, paler below. Front dark shining green. Antennae 

 black; third joint slightly longer than wide, somewhat oval in out- 

 line, oidy a little pointed at tip. Orbital cilia wholly black. 



Thorax dark green, with a more or less distinct median bronze 

 vitta on the dorsum; pleurae a little dulled with gray pollen. Abdo- 

 men dark green with bronze reflections, which are more distinct on 



