502 PROCEEDINGS OF THE ACADEMY OF [Sept., 
stripes; male hypopygium with the ninth tergite deeply notched 
medially; eighth sternite not armed with hair-bearing lobes. 
Male. — Length, 14.2 mm.; wing, 17.2 mm. 
Frontal prolongation of the head moderately long, pale bro^vnish 
white above, brown on the sides, the nasus distinct. Palpi rather 
short, dark brown. Antennae \vdth the scapal segments dull brownish 
yellow, the third segment yellowish brown, darkest apically; the 
remaining segments of the flagellum dark l^rown; the basal enlarge- 
ment brownish black, the terminal segments almost uniform in 
color; antennjB rather long and comparatively slender, if bent 
backward extending al^out to the base of the abdomen or a little 
beyond; segments of the flagellum with the basal portion only a 
little more enlarged than the pedicel; a dense white pubescence on 
the antennal segments. Head light gray with an indistinct median 
brown suffusion. 
Mesonotal prsescutum dull yellow with three broad brown stripes, 
of which the median one is indistinctly l)isected by a paler median 
line, which in turn encloses a narrow dark brown median vitta; 
lateral stripes uniform in color, short, beginning far behind the 
pseudosutural fovese; pseudosutural fovese dark brownish black; 
scutum almost uniformly brown; scutellum and postnotum gray, 
the latter wdth a large brown spot on either side of the middle line. 
Pleura pale, rather densely light gray pruinose. Halteres rather 
long, light bro\^^l, more yellowish at the extreme base. Legs with 
the coxse light brown, dusted with gray; trochanters dull yellow; 
femora brownish yellow, narrowly dark brown at the apex; tibiae 
light brown, tipped with darker, the tibial spurs light colored with 
the apical half chitinized, black; tarsi dark brown. Wings with a 
faint brownish suffusion, the costal cell more yellowish; stigma 
dark brown; a large vitreous spot beyond the stigma; a broad 
vitreous band before the stigma, brightest, almost white, as a spot 
beyond the apex of Sc2 in cell C and in cell 1st Ri (see Plate XVII, 
fig. 19). 
Abdomen yellowish brown, the tergites with the lateral margins 
broadly pale, the caudal margins narrowly pale; a very indistinct 
interrupted sublateral stripe. Male hypopygium rather small. 
Ninth tergite (see Plate XIX, fig. 57) broadly transverse, the caudal 
margin with a broad, deep notch which bears at its base a depressed 
median tooth. Ninth pleurite incomplete, the suture only present 
beneath, though the outline of the sclerite is indicated throughout; 
the outer pleural appendage (see Plate XX, fig. 73) is slender at the 
