728 MOSQUITOES OF NORTH AMERICA 



Prothoracic lobes elliptical, remote dorsally, black, clothed with whitish 

 scales and pale tipped setae. Mesonotum black, clothed with narrow curved 

 scales, dark bronzy or pale brown in a moderately broad median stripe, grayish- 

 white laterally, about the antescutellar space and on the anterior margin ; a 

 narrow dark-brown stripe each side of antescutellar space, extending over pos- 

 terior third of disk ; a few brown scales on humeral margins. Scutellum trilo- 

 bate, black, clothed with whitish scales, each lobe with a group of pale setaj. 

 Postnotum elliptical, prominent, black, nude. Pleurae black, coxae brown, 

 clothed with patches of elliptical, flat white scales and rows of pale setae ; epimera 

 clothed with whitish, narrow curved scales like those on mesonotum. 



Abdomen subcylindrical, flattened, tapering posteriorly; dorsal vestiture of 

 black and white scales, the white ones forming broad basal and very narrow 

 apical segmental bands with a few scattered scales along the median line, some- 

 times forming a medio-dorsal stripe, the white basal bands widened on the sides 

 but not continuous, interrupted apically by the black ground-color; in some 

 specimens both the median pale scales and the apical bands are absent; venter 

 white scaled. Cerci black. 



Wings rather broad, hyaline ; petiole of second marginal and second posterior 

 cells about as long as their cells ; basal cross-vein about its own length distant 

 from anterior cross-vein ; scales of the veins black and white, costa largely black 

 scaled, shortly white at base ; subcostal vein with the white scales predominating, 

 third vein, forks of fourth and fifth vein with its forks black scaled, second and 

 fourth veins mostly white sealed, sixth vein white with a few black scales. 

 Halteres brownish, with black knobs. 



Legs moderate; femora with whitish scales below, except at extreme tip, 

 above black mottled with whitish ; knees narrowly whitish ; tibia grey scaled 

 with a few black ones intermixed, principally on upper and lower sides; tips 

 black ; tarsi with the basal joint grey scaled, the black scales predominating more 

 outwardly, the remaining joints wholly black dorsally, grey beneath and at 

 sides. Claw formula, 1.11.1-1.1. 



Length : Body about 4.5 mm. ; wing 4 mm. 



Male. Proboscis rather long and slender, the vestiture black. Palpi exceed- 

 ing the proboscis by the length of half of the last joint; last two joints and 

 tip of long joint enlarged and bearing dense long brown hairs. Antennae plu- 

 mose, the last two joints long and slender, rugose, pilose, black, the others 

 short, brown, unicolorous ; hairs of whorls long, dense, dark brown. Coloration 

 similar to the female. Wings narrower than in the female, the stems of the 

 fork-cells longer, the vestiture sparse. Abdomen elongate, depressed, with 

 pale lateral ciliation. Claw formula, 2.1-2.1-1.1. 



Length : Body 5.5 mm. ; wing 4 mm. 



Genitalia (plate 27, fig. 186) : Side-pieces over twice as long as wide, tips 

 rounded ; apical lobe developed, rounded ; basal lobe rounded, somewhat promi- 

 nent, covered with tubercles bearing short setae, a large stout spine on lower 

 side accompanied by a group of setae. Clasp-filament long, somewhat swollen 

 mesially, with three setae without near the tip and a long articulated terminal 

 spine. Harpes elliptical, inner margin thickened and revolute, bent and pointed 

 at tip. Harpagones with moderate, thick, columnar stem and terminal fila- 

 ment, which is expanded beyond the base and slightly irregularly notched. 

 Basal appendages small, with several short setae. 



Life history and habits unknown. 



Nevada, Idaho, and Montana. 



Market Lake, Idaho (J. M. Aldrich) ; Pocatello, Idaho, June 24, 1904 (E. 

 S. G. Titus) ; Dillon, Montana, August 5, 1908 (R. A. Cooley) ; Elburz, Nevada, 

 June 25, 1903 (H. S. Barber). 



