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 with the scapal segments dull brownish 

 yellow, the third segment yellowish brown, darkest apically; the 

 remaining segments of the flagellum dark brown; the basal enlarge- 

 ment brownish black, the terminal segments almost uniform in 

 color; antennae rather long and comparatively slender, if bent 

 backward extending about 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 wiiite 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 bisected 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 foveae; pseudosutural fovese dark brownish black; 

 scutum almost uniformly brown; scutellum and postnotum gray, 

 the latter with a large brown spot on either side of the middle line. 

 Pleura pale, rather densely light gray pruinose. Halteres rather 

 long, light browTi, more j^ellowish at the extreme base. Legs with 

 the coxae 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 Sd 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 



