60 Pysche [April 



small black hair near base; front femora thick at base, below with white hairs on 

 outer side and a row of about four stiff spines near base, on the inner side below 

 with numerous black spines in one row, " five to seven spines in the broader basal 

 portion of the femur are considerably longer than the other spines, which are 

 inserted in two or three irregular rows." Inner side of the front tibia with a regular 

 row of stiff spines, running up on a slight process of the tibia at its distal end. 

 Middle and hind legs simple, tarsi blackish with yellowish pulvilli. Abdomen 

 short and compressed, bronze-green, the hypopygium retracted. Length, 2.9 mm.; 

 of wing 4. 



Female. Beard and hair of front coxae more yellowish; the postorbitals come 

 down two-thirds the height of the eye — thirteen in number in the specimen. 

 Wings a little more infuscated. Length, 2.7 mm.; of wing, 4.7. 



The description is drawn from eight cotypes in Professor Melan- 

 der's collection, Hunter's Creek, Wyo., Sept. 11, 1895, Lusk, 

 Wyo., Aug. 26, 1895, and Black Rock Creek, Wyo., Sept. 13, 

 1895. I also have eight females, Marshall Pass, Colo., 10,856 

 ft., July 28, 1908. 



Hydrophorus tnagdalenae Wheeler (fig. 6). 



Male. Occiput bronze-green, with some brownish dust and only two postverti- 

 cal bristles; front opaque brown; face rather wide, slightly dusted allover, yet 

 with the green metallic ground color showing through distinctly on the upper 

 half, where the dust is brown; on the lower half the pollen is yellowish white; 

 palpi dark brown poUinose; antennae rather small, first joint a little stout at apex; 

 cheek narrow, dependent; postorbital bristles about twelve, descending a little 

 below the middle of the eye; beard yellowish, a few black spines under the neck. 

 Thorax golden green, heavily overlaid toward the front with brownish dust, which 

 extends down on the pleurae and becomes gradually paler; six or seven dorsocentrals, 

 two humerals, four large scutellars; propleura with long yellowish hair and 

 one black bristle; aiew microscopic scattered white hairs on the upper end of the 

 sternopleura; halteres yellow; wings moderately broad, veins yellowish at base, 

 the costa becoming black at the tip of the first vein or beyond it. Legs rather 

 bright golden green; front coxae with rather long whitish hairs and at tip a few 

 small black setae; front femora with white hairs and a short row of spines on the 

 outer side below at base; on the inner side below a row of spines extending about all 

 the length; tibia on inner side with a row of slanting spines, the apex of the tibia 

 not enlarged toward the femur; all the tarsi blackish, with large, divergent claws 

 and brownish pulvilli. Abdomen quite bright green, with long, almost woolly 

 white hair along the sides extending to the tip in diminishing length; hypopygium 

 concealed, the two flaps that project behind the lower part with rather long and 

 dense white hair; fourth segment projecting V-shape below. Length, 3.5 mm.; 

 of wing, 4.5 



The female differs hardly at all from the male. Length, 4.6 mm.; of wing, 5.7. 



