ART. 21. DOLICHOPOD FLIES FROM ALASKA — VanDUZEE. 15 



Genus HYDROPHORUS Fallen. 



Hydrophorus Fallen, Dipteni Sueci:ie, Dolichopodes, ]82:i, p. 2. — Loew. 

 Smiths. Misc. Colls., No. 171, p. 211.— Aldrich, Psyche, vol. 17, pp. 4.")-73, 

 1 pi., 1911. ■ 



HYDROPHORUS INNOTATUS Loew. 



Hydrophorus innotatus Loew, Smiths. Misc. Colls., No. 171, p. 212, 1864. — 

 Malloch, Rept. Canadian Arctic Exped., vol. 3, p. 50c, 1920.— Aldrich, Psyche, 

 vol. 18, p. 66, 1911 ; Proc. U. S. Nat. Mus., vol. 61, p. 17, 1922. 



Four examples were taken at the following locations : Anchorage, 

 Alaska, June 11; Seward, Alaska, July 24; Nenana, Alaska, June 

 28; Fairbanks, Alaska, June 30. Described from Sitka, Alaska. 

 Since reported from several places in Alaska and from Washington 

 and Oregon. 



HYDROPHORUS CHRYSOLOGUS Walker. 



Medeterun clirpsologits Walkeb, List, vol. 3, p. 655, 1849. — Loew, Smiths. 

 Misc. Colls., No. 171, pp. 215 and 309, 1864.— Wheeler, Proc. Calif. Acad. Scl., 

 vol. 2, p. 63, 1899.— Aldrich, Psyche, vol. 18, p. 62, 1911. 



One female was taken at Healy, Alaska, June 26. This was de- 

 scribed from Martin Falls, Canada; has been reported from several 

 places in the Eastern States. 



HYDROPHORUS MINIMUS, new species. 



Male. — Length, 2.5 mm. ; of wing, 3 mm. Face, blue-green on 

 upper portion, suture near apical third, the lower part opaque with 

 silvery white pollen, which is thin above the suture. Front, gi'een 

 with considerable broMm pollen; occiput, green with the orbits white 

 pollinose. Cheeks quite wide, truncate at lower edge. Antennae 

 black; third joint small, about as long as wide, obtusely pointed at 

 tip. Palpi black, covered with gray pollen. The short black orbital 

 cilia not reaching the middle of the eye. Beard yellowish white, 

 scanty. 



Thorax brown, nearly opaque, still with some purple reflections; 

 scutellum more purple, with four marginal bristles: prothorax with 

 several yellow bristle-like hairs above fore coxae, without a black 

 bristle. Abdomen metallic green, rather dull, hairs black on the 

 dorsum, partly yellow, but short on the sides, bristles on the hind 

 margin of last segment yellowish. Hypopygium small, its append- 

 ages but little exposed, fourth ventral segment extending downward 

 and cut into on hind margin. 



Fore coxae greenish with short pale hairs and one small black 

 hair-like bristle at upper outer corner, without black bristles at tip. 

 All femora and tibiae metallic green. Fore femora (fig. 12) a little 

 thickened at base, with pale hairs below and a cluster of black spines 

 near the base on lower front edge. Middle and hind tarsi blackish, 

 plain, about as long as their tibiae, first joint longer than second: 

 fourth and fifth joints of middle pair of nearly equal length: hind 



