OSTEN SACKEN ON WESTERN DIPTERA. 263 



parently belong bere. Tbe anteuute are yellow, tberefore paler tban tbe 

 descriptioa makes tbern ; tbe sbeatb of tbe proboscis is variable in its 

 coloring", being sometimes entirely black, sometimes yellow, except tbe 

 lips, wbicb remain black ; tbe costa is yellowisb-browu (and not black, 

 as tbe description bas it). Tbe specimens from Illinois are smaller, and 

 have no stump of a vein in tbe discal cell. Tbese discrepancies not- 

 withstanding, I could not take my specimens for a different species be- 

 fore comparing tbeTi witb tbe types of the description. P. sulphurea is 

 figured in Mr. Glover's Manuscript Notes, etc. (Diptera, tab. v, f. 1). The 

 male of this species bas tbe abdominal segments tinged with brownish 

 at the base, the hind margins remaining sulphur-yellow. 



2. Phthiria scolopax n. sp. — Drab-colored 5 thorax witb faint yel- 

 low lines; legs yellow, tips of tarsi black; wings large, all tbe cross- 

 veins strongly, all tbe ends of longitudinal veins and the distal half of 

 tbe costa more faintly, clouded witb brown; proximal ends of tbe sec- 

 ond submarginal and of tbe tbird posterior cells square, and both pro- 

 vided on tbe outside with a long stump of a vein. Length G-T™"* (with- 

 out tbe proboscis). 



Head yellowish ; cheeks, except tbe orbits, dark brown or reddish- 

 brown, shining, with a yellow cross-line in the middle; ocellar triangle 

 in tbe male dark brown, grayish-pruinose ; frontal triangle yellow in 

 the middle, reddish-brown on the sides, which color is separated by a 

 yellow line from the brown of the cheeks ; in the female, the interval 

 between the eyes is yellowish-brown, witb a dark brown spot on the 

 vertex, upon which are tbe ocelli; the orbits of tbe eyes are sulphur - 

 yellow. Palpi long and slender, dark brown. Antennge yellowish- 

 brown, last joint more brown, nealy three times the length of the 

 two first takeu together, its sides nearly parallel, its tip distinctly 

 emarginate. Proboscis nearly as long as the body in the male, some- 

 what shorter in the female. Thorax opaque yellowish-gray, beset with 

 an appressed golden tomentum ; on the dorsum, two pale yellow longi- 

 tudinal lines, and a third, much more delicate one, between; lateral 

 margins of tbe dorsum and antescutellar callosities likewise yellowish ; 

 scutellum with a yellow line in the middle, and often witb a brown spot 

 on tbe tip. Halteres yellow, with a brown spot on tbe knob. Abdomen 

 brownish-yellow. Legs yellow, tarsi, except the base, dark brown. 

 Wings rather large and broad; the proximal ends of the second sub- 

 marginal and of the third posterior cells are square ; each emits on the 

 outside a long stump of a vein, projecting, the one into the first sub- 

 marginal, the other into the discal cells; the cross- veins at the base of 

 tbe second submarginal and of the four posterior cells are clouded with 

 dark brown, which clouds extend along the above-mentioned stumps; a 

 large cloud at tbe bifurcation of the second and third veins; the costal 

 margin, especially beyond tbe end of tbe auxiliary vein, and the ends of 

 all the longitudinal veins, are also clouded. In most specimens, there 

 is a curved stump of a vein with a cloud upon it, on tbe second vein, 

 opposite tbe small cross- vein, and inside of the first submarginal cell. 



