1915.] NATURAL SCIENCES OF PHILADELPHIA. 473 
palpi light brown, the terminal segment darker. Antennie with 
the four basal segments light yellow, the remainder light brown, the 
basal swelling of each segment only a little darker than the remainder 
of the segment. Front with a small tubercle; head light gray with 
a very narrow brown line extending from the middle of the tubercle 
caudad to the occiput. 
Thoracic dorsum light gray with rather indistinct brown stripes, 
the median stripe broader in front, narrowed behind, indistinctly 
split by a pale middle vitta; lateral stripes narrower and less dis- 
tinct; scutum pale grayish white, the middle portions of the lobes 
brown; postnotum and scutellum dull yellow, rather thickly dusted 
with grayish white. Pleura rather pale grayish white. Halteres 
pale, the knob brown. Legs with the coxse pale dusted with whitish; 
trochanters pale yellow; femora dull yellow passing into brown 
toward the tip; tibia? and tarsi brown. Wings whitish subhyaline, 
the costal cell more yellowish; tip of the wing broadly dark brown; 
an indistinct interrupted brown cross-band from the stigma along 
the cord; a brown cloud at the origin of Rs, at the arculus, at two- 
thirds the length of cell M. Venation (see Plate XVI, fig. 4) : tip 
of R2 atrophied. 
Abdominal tergites dull yellow with a median brown longitudinal 
line on the first segment; remaining tergites yellowish brown, 
segment seven and the caudal portions of six largely dull yellow; 
segment nine dark brown. Sternites dull yellow, segments six to 
nine more brownish. Male genitalia (see Plate XVIII, fig. 32) 
with the eighth tergite narrow. Ninth tergite (see Plate XIX, 
fig. 45) subquadrate, the caudal margin deeply and broadly concave, 
a blunt, rounded lobe on either side of this concavity, a sharp median 
tooth and a smaller denticle midway between the median tooth 
and the rounded lobe. Ninth pleurite rather small, complete, the 
dorso-caudal margin produced into a sharp point which is directed 
caudad; the ventro-caudal portion rounded and provided with 
alumdant rather long hairs; pleural appendages two, the outer 
appendage a slender, small, fleshy lobe, subsigmoid to cylindrical 
in shape; the inner pleural lobe is complex, consisting of a large, 
flattened portion which is produced in front into a moderately sharp 
point which is directed cephalad ; underneath the base of this point 
on the anterior or cephalic margin is a black, chitinized lobe which 
is directed laterad; the base of this appendage is hollowed out into 
a conspicuous cup-shaped lobe w^hich is directed laterad and bears 
a small, sharp spine behind and beneath. 
