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



Mesonotum slightly discolored in the unique type, dull 

 yellow, the praescutum with three distinct brown stripes, the 

 median stripe paler down its center and split by a capillary 

 dark brown Hne; scutum with the lobes dark brown; scu- 

 tellum yellow; postnotum light brown, sparsely pruinose. 

 Pleura dull yellow, sparsely spotted with light brown. Hal- 

 teres påle, the knobs and dis tal part of the stem dark brown. 

 Legs with the coxae brownish yellow; trochanters dull yel- 

 low; femora påle brownish yellow with a comparatively nar- 

 row brown ring before the tip; tibiae yellow, the tips faintly 

 darkened; tarsi påle brownish yellow, the distal segments 

 darkened. Wings whitish subhyaline, conspicuously streaked 

 with brown; costal and subcostal cells more brownish yellow, 

 a spöt in the latter at the origin of Bs and the tip brown; 

 stigma dark brown, including the fork of Es; a large dark 

 brown area including the outer end of cell i?^ and the 

 middle of JR3; a broad seam along Cu in cell M, the outer 

 portions of cells 31 1, 2nd M2, M4, Cuj and the Anal cells 

 påle brown; a conspicuous white streak extending the length 

 of the wing, occupying most of cell i?, the anterior margin 

 of M, the basal half of cell 1st Bj, all of 1st M2 and B5, 

 and the basal third of cells Mi, 2nd M2, M4 and the nar- 

 row anterior and basal portions of Cui; cell Cu slightly dar- 

 kened on its basal half but with the outer half practically 

 clear; 1st Anal cell clear except for a brown cloud at the 

 margin and another adjoining vein 2nd A; cell 2nd A clear, 

 the margin and anal angle of the wing darkened; the con- 

 spicuous white area beyond the stigma includes the outer 

 half of cell 2nd B2, nearly the basal half of B2, and a spöt 

 near the base of cell B3', veins dark brown, more yellowish 

 in the påle areas. 



Abdomen dull brownish yellow, narrowly trivittate with 

 brown. Ovipositor with the tergal valves very long and 

 slender, almost straight; sternal valves very short and com- 

 pressed, yellow, the tips obtuse. 



Hahitat. — Tierra del Fuego. 



Holotype, $, Rio Grande, February 1896 (Ohlin), Col- 

 lector's No. 1020. 



Type in the Riksmuseum in Stockholm. 



Tipula ona is apparently olose to T. rufirostris Bigot, 

 which has the wing-pattern much darker. To judge from 



