140 MELANDER AND BRUES. [VOL. 1 



black, basal portion opaque, white dusted, with two patches of black hair 

 dorsally ; towards the apex very shining. Internal appendages ferruginous. 

 Lamellae subrectangular, dirty, translucent, white, with brown border, wider 

 at apex, where it is jagged and bristly. Pleurae very dark green, opaque, 

 white dusted. Legs, including coxae, totally black, except the anterior libiae 

 above and the base of anterior tarsi, which are more or less yellow above. 

 femora indistinctly tipped with brownish- yellow. Tarsi not ornamented, 

 hind tarsi with the usual bristles. Wings grayish, tinged with brown in 

 front and along the veins ; costa with a short swelling in the angle which it 

 makes with the first vein ; bend in the fourth vein not very abrupt ; second 

 and third veins much approximated except at tip ; no distinct incision at 

 tip of fifth vein. Tegulae and halteres yellow ; tegular cilia black. 



One male, North Park, Colorado, over 9000 feet, collected 

 during July. 



This is closely related to ovatus Loew, but is distinct by 

 the much larger subrectangular lamellae, costa with a swell- 

 ing, second and third veins more approximated, and wings 

 brownish in front. 



Dolichopus agronomus, sp. nov. 



Femora chiefly black, cilia of inferior orbit pale, middle tibiae yellow, first 

 joint of hind tarsi with few bristles, hind femora ciliated with short hairs. 



Male. Length 3.5 mm., of wing 3 mm. Dark metallic green. Probos- 

 cis and palpi piceous. Face very long, densely covered with bright silvery 

 pollen, which continues past the antennae as far as the frontal bristles. 



Above the antennae it is greenish-white and 

 not so dense. Antennae long, totally black, 

 the first two joints short, the third large and 

 broad, elongated ovate and rather sharply 

 pointed. Arista black, pubescent, a little longer than the an- 

 tenna. Postocular cilia black above, pure white below. Thorax 

 bluish-green, covered with very fine white dust. A median shin- 

 ing stripe is not at all dusted. Abdomen very strongly com- 

 pressed toward apex, dark green, white dusted, especially along 

 FIG. 17. n. {he sides. The extreme basal and apical margins of the seg- 



agronomits : 



male antenna ments more or less free from the dust. Entire abdomen 

 and lamella. covere d with short black hairs. Hypopygium black, shining, 

 covered at base with white dust. Internal appendages light yellow. 

 Lamellae nearly white with an indistinct narrow blackish border; elongate 

 oval. Each lamella nearly bilaterally symmetrical, but little angulate 

 inwardly and beset with the usual bristles. Pleurae greenish-black, dusted 

 with gray. Coxae of same color as the pleurae, all tipped with yellow, the 



