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- 

 forml}^ brown; 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 brown. 

 Legs not elongated as in the closely allied perlongipes Johnson, Avith 

 the coxae pale brown with a sparse grayish bloom; trochanters and 

 femora yellow, the latter narrowly dark brown at the apex; tibiae 

 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 M2; 

 vein Cu and its branches indistinctly seamed with brownish. Vena- 

 tion: Rs long; cross-vein 7n-cu at the fork of M, very long and 

 prominent (see Plate XVI, fig. 6). 



Abdomen with the first tergite grajdsh, the remainder dark b>'0wn; 

 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 

 perlo7igipes Johnson, sulphurea Doane, et al., 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- 



