1915.] NATURAL SCIENCES OF PHILADELPHIA. 481 
nasus very long and slender, reddish brown. Palpi dark brown. 
Antennae rather elongated in the male, the scape yellowish brown, 
segments three to five with the base of a paler brownish yellow than 
the remainder of the segment, the terminal flagellar segments uni- 
formly browai; segments of the flagellum with a short basal enlarge- 
ment which is about one-third of the length of the segment. Head 
light gray. 
Pronotum pale brown, the scutellum deeply divided medially 
by an impressed black line which ends on the caudal margin of the 
scutum. Mesonotal prsescutum brownish gray without distinct 
stripes excepting the single very narrow median vitta which runs to 
the suture; scutum with the lobes dark gray, the median area paler, 
brown; scutellum pale yellowish white with a sparse light gray 
bloom; postnotum light gray with a delicate impressed median 
line on the caudal half. Pleura clear light gray. Halteres bro\^^l. 
Legs not elongated as in the closely allied perlongipes Johnson, with 
the coxae pale bro\vn with a sparse grayish bloom; trochanters and 
femora yellow, the latter narrowly dark brown at the apex; tibiie 
light brown, the terminal portion dark brown; tarsi yellowish brown. 
Wings light brown, the costal region more yellowish; the stigma pale 
brown; a vitreous band before the cord extending into cell 1st M^; 
vein Cu and its branches indistinctly seamed with brownish. Vena- 
tion: Rs long; cross-vein m-cu at the fork of M, very long and 
prominent (see Plate XVI, fig. 6). 
Abdomen with the first tergite grayish, the remainder dark browai; 
segments three to five with the caudal margin conspicuously pale 
silvery; tergite three with a broad basal band destitute of hairs 
and including a transverse rectangular area that is provided with 
large, coarse punctures; this does not occur on the succeeding 
tergites; sternites brown, the lateral margins and the apices a little 
more yellowish. Hypopygium (see Plate XVIII, fig. 34) as in 
perlofigipes Johnson, sulphurea Doane, et at., the ninth tergite prac- 
tically fused with the sterno-pleural region into a continuous ring; 
there is a very indistinct groove between the tergite and sterno- 
pleurite; region of the ninth tergite (see Plate XIX, fig. 48) small, 
the caudal margin straight across or nearly so with a very broad 
median lobe which is weakly divided by a U-shaped median notch; 
viewed from the side, this median lobe is high and prominent, the 
caudal end blackened, spiculose. Ninth sterno-pleurite extensive, 
the pleural suture indicated beneath, the pleural region cylindrical, 
produced caudad; outer pleural appendage a flattened, subrectan- 
