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



9. Cell Rs entirely darkened; (first scapal segment dark; 

 antennaelong; male hypopygium with the appendage 

 of the eighth sternite trifid, the lateral lobes obli- 

 quely truncated at their tips). (Magallanes, Straits 

 of Magellan.) T. patagonica, sp. n. 



Cell Bs with at least the outer half påle; (scapal 

 segments påle; antennae shorter; male hypopygium 

 with the appendage of the eighth sternite trifid, the 

 lateral lobes indistinctly bilobed at their tips). (Ti- 

 erra del Fuego.) T. fuegiensis, sp. n. 



10. Head and thorax black; (femora with a conspicuous 

 subterminal yellow ring). (Santa Cruz, Southern 

 Patagonia.) T. flavo-annulata Jacobs 



Head and thorax not black. 11. 



11. Wings with the costal and subcostal cells and a 

 stripe immediately behind vein Cu strongly yello- 

 wish; (antennae with the second scapal segment dull 

 yellow; femora with a conspicuous yellow subter- 

 minal ring). (Magallanes, Straits of Magellan.) 



T. higotiana, sp. n. 



Wings with the above cells not strongly yellowish. 12. 



12. Subcostal cell with four large brown blotches, the 

 påle interspaces very small and restricted; (antennae 

 with the scapal segments yellowish; femora with a 

 conspicuous yellow subterminal ring; male hypopy- 

 gium with the appendage of the eighth sternite 

 small, semi-circular). (Magallanes, Straits of Ma- 

 gellan.) T. antar ctica, sp. n. 



Subcostal cell with the brown blotches and påle in- 

 terspaces approximately subequal or the latter more 

 extensive than the former. 13. 



13. Mesonotal praescutum gray with four narrow brown 

 stripes; second scapal segment brownish; (male hy- 

 popygium with the ninth tergite almost squarely 

 truncate across its caudal margin; sternal valves of 

 the female ovipositor almost as long as the tergal 

 valves). (Magallanes and Tierra del Fuego.) 



T. tehuelche, sp. n. 



