1915.] NATURAL SCIENCES OF PHILADELPHIA. 473 



palpi light brown, the terminal segment darker. Antennae 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 wdiite. 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; tibise 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 yello^vish 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 toothy 

 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 \vith 

 abundant 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 which is directed laterad and bears 

 a small, sharp spine behind and beneath. 

 31 



