ART. 21. DOLICHOPOD FLIES FROM ALASKA VanDUZEE. 5 



Genus ARGYRA Macquart. 



Anji/m Macquart. Hist. Nat. Diptera, vol. 1, p. 456, 1834.— Loew, Smiths. 



Misc. Colls., No. 171, pp. 123-132, 1864.— Bkcker, Nova Acta, vol. 104, pt. 2. 

 pp. 61-74, 1918. 



ARGYRA CILIATA. new species. 



Male. — Length 5 mm. Face narrow, velvety black. Front black, 

 somewhat shining. Palpi black with pale hairs and one slender 

 black bristle. Proboscis black, more yellowish on the edge, its hairs 

 pale. Antennae black, first joint nearly as long as third, with many 

 stiff hairs above; third joint obtusely pointed at tip; arista sub- 

 apical, a little longer than the antennae. Lower orbital cilia whitish, 

 upper half of orbits nearly bare, except a few very minute black 

 hairs at top. 



Thorax shining green vrith a coppery line on each side of the 

 acrostichal bristles; scutellum blue with four large marginal bris- 

 tles; pleurae with silver}' white pollen whicli extends over the 

 humeri. Abdomen black with slight green reflections, thickly cov- 

 ered with silvery white pollen, second segment with a large yellow 

 spot on each side; short hairs on the dorsum black, the long hairs 

 on the sides yellow ; first segment with a row of long black bristles 

 on posterior margin and a cluster of stiff yellow hairs on each side. 

 Hypopygium and its appendages black; the outer lamellae some- 

 what lanceolate, projecting downward, with many black bristles on 

 posterior edge; there are two black bristles as long as the height 

 of the hypopygium and several shorter ones on the posterior sur- 

 face of the hypopygium ; the inner appendages are a pair of sharp- 

 pointed, slightly curved hornlike organs. 



Coxae black with yellow tips; fore and middle pairs with partly 

 black and partly yellow hairs; hind ones with one large and two 

 small bristles on outer surface. Fore and middle femora blackened 

 on basal half or more, still the yellow reaches nearly to the base on 

 the front side of middle pair; they are ciliated below with long 

 3^ellowish hairs, which are longer than their width ; the anterior 

 ones also have long black liair on posterior surface. Hind femora 

 yellow with more than apical tliird black, and with a row of long, 

 black, stiff hairs on lower outer edge, the longest of which are 

 nearly twice as long as the width of the femora. Tibiae yellow, 

 posterior pair with apical third black, their upper surface with 

 long black hair; fore tibiae with several slender bristles on outer 

 upper edge, the middle ones also with a few small scattered ones. 

 All tarsi as long as their tibiae; anterior pair yellow, tlie last two 

 joints blackened above, first joint as long as the remaining four 

 taken together and having on entire lower edge a row of small 

 black bristles, which arc fully as long as the diameter of the joint. 

 Middle tarsi with tlic first joint about as long as the remaining four 

 taken together, infuscated from the second joint. Hind tnrsi entirely 



