18 ARKIV FÖR ZOOLOGI. BAND 13. N:0 6. 



►sely incised beneath, the basal enlargement but little con- 

 spicuous (PJate 2, fig. 19). Head dark gray, the vertical 

 tubercle conspicuously light gray; vertex with a conspicuous 

 narrow dark brown median line; vertical tubercle verylarge 

 and conspicuous in both sexes. 



Mesonotal praescutum dark, heavily gray pruinose, with 

 four bright brown stripes, the intermediate pair very in- 

 distinct, formed by the lateral margins of the usual median 

 stripe; lateral stripes and the extreme lateral margins of the 

 praescutum more distinctly brown; scutum dark gray, each 

 lobe with two brown marks; scutellum and postnotum gray 

 with a capillary dark brown median line. Pleura light gray. 

 Halteres brown, the base of the stem somewhat more orange, 

 the base of the knobs a little paler. Legs with the coxae 

 light gray pruinose; troclianters brown; femora dull yello- 

 wish brown, the tips narrowly dark brown, immediately before 

 the tips a little brightened; tibiae brown, the tips dark brown; 

 tarsi dark brown; the legs of the female are proportionately 

 stouter than those of the male. Wings whitish subhyaline, 

 rather heavily marbled with brown and gray, the costal and 

 subcostal cells more yellowish; subcostal cell with four dark 

 brown spöts, the two intermediate large, rounded, continued 

 down into cell R and larger than the space between them; 

 the memainder of the wing is clouded with gray, very påle 

 and zigzag in the anal cells. 



Abdominal tergites dull yellow with three dark brown 

 stripes, the sublateral stripes very broad, the median stripe 

 narrower, all three stripes connected transversely by very 

 broad posterior margins to the tergites which restrict the 

 yellow markings to a small anterior area on eitber side of 

 the median stripe on the intermediate segments; lateral mar- 

 gins of the tergites broadly and conspicuously påle buff, 

 interrupted on the basal ring of each tergite; sternites dark 

 brown. Male hypopygium with the ninth tergite (plate 2, 

 fig. 13) flattened, the caudal margin flattened and very 

 gently concave to almost truncate; the dorso-median area 

 weakly membranaceous. Ninth pleurite complete, the ven- 

 tral proximal angle (plate 2, fig. 18) produced caudad into a 

 very short, stout obtusely rounded lobe that is dark in color 

 and sparsely hairy; outer pleural appendage (plate 2, fig. 17) 

 enlarged distally, the club provided with coarse erect hairs; 



