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



Frontal prolongation of the head dark brown, sparsely 

 gray pruinose; palpi dark brown. Antennae with the scapal 

 segments yellowish, the base of the first segment a little 

 infuscated; flagellum dark brown, the segments rather long 

 and moderately incised beneath. Head dark gray, påle gray 

 adjoining the inner margin of the eyes and on the front. 



Mesonotal praescutum gray with six narrow dark brown 

 stripes, the two intermediate being the broad margins of the 

 usiial median stripe that is divided by a gray line of some- 

 what greater width; sublateral and lateral stripes short, 

 narrowly separated by a light gray space; scutum gray, the 

 lobes with small brown marks; remainder of the mesonotum 

 gray. Pleura dark gray, the dorso-pleural membrane in- 

 distinctly yellowish. Halteres dark brown, the base of the 

 stem påle. Legs with the coxae light gray; trochanters duU 

 yellöw, the apices narrowly blackened; femora light brown, 

 the tips broadly dark brownish black, before the tips with a 

 nearly subequal yellowish ring; tibiae yellowish brown, dar- 

 kening toward the tip; tarsi dark brown; legs long and 

 slender. Wings brown, sparsely variegated with subhyaline; 

 subcostal cell with four large, dark brown blotches that are 

 very much larger than the påle yellowish interspaces; stigma 

 brown; påle areas arranged as follows: before and beyond 

 the stigma; tip of cell Rs] near the base of cell R^; before 

 the origin of Rs in cell R\ before the end of cell M\ zigzag 

 areas in Cu and 1st A; veins dark brown. 



Abdomen with the first tergite and the base of the se- 

 cond dark brown, broadly margined laterally with buff; 

 posterior margins narrowly brown, this increasing in amount 

 on the outer segments; segments six to nine dark brownish 

 black. Male hypopygium of simple structure. Ninth tergite 

 (plate 2, fig. 12) large, flattened, the posterior margin with 

 a deep narrow notch, the adjoining, lobes with the tips bro- 

 adly and obtusely truncated. Ninth pleurite complete; outer 

 pleural appendage påle, a little enlarged distally, provided 

 with sparse long hairs. Ninth sternite with a narrow pro- 

 found median incision. Eighth sternite (plate 2, fig. 15) 

 black with a small semi-circular median extension, with a 

 whitish spöt on either side at the base. 



Hdbitat. — Territory of Magallanes, Chile. 



