400 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. f.8. 



17. Wings banded browu and white, with a broad, uninterrupted wliite cross- 



band beyond the stigma, extending from the end of cell second Ri to 

 the niiddie of cell Ms, or beyond to the wing margin ; antennal flagellum 



unicolorous T. trivittnta (p. 407). 



Wings without such an uninterrupted white crossband beyond the stigma— 



18. 



18. Large, length of male over 25 mm.: vertex light yellow, thoracic dorsum 



with a velvety black pattern, margined with paler producing an ocellate 

 appearance; abdominal tergites bright orange with a broad brownish 



black stripe on either side, segments 7 to 9 dark brownish black 



T. abdominalis (p. 403). 

 Smaller, length of male usually under 20 mm. ; not colored as above 19. 



19. Coloration bright orange, the thoracic doi'sum without darker stripes ; wings 



yellowish basally, more clouded with brown apically ; male liypopygium 

 assymetrical, the right pleurite produced caudad into a prominent two- 

 cleft arm (male, speciosa Loew) ; the female is conspicuously different, 



the wings being dark brown, sparsely marked with white 



T. fuliginosa (p. 405). 

 Coloration not as above 20. 



20. Male hypopygium with the ninth tergite produced caudad into a compressed 



median lobe ; antennae elongate, bicolorous ; wings with an extensive 

 brownish gray blotch before the cord, occupying the ends (;f cells R and M 



and the lower basal angle of cell Cn, T. hcruiannia (p. 405). 



Male hypopygium not as above 21. 



21. Wings with a pale gray tinge, more brownish in cell M along vein Cu; 



hyaline spots in the anal cells, at two-thirds the length of cell M, before 

 the stigma, and an interrupted band before the cord extending to cell 

 first M2; body coloration gray, male hypopygium small, not conspicuously 

 elongated or enlarged (froyiUs group) 22. 



AVings brown or dark gray, with a pattern of white or hyaline spots and 



blotches 23. 



.22. Stripes on the praescutum ending at the level of the pseudosutural foveae, 

 the intermediate pair blunt at their anterior ends; apical tergites of the 

 abdomen not conspicuously darkened T. fragilis (p. 404). 



Intermediate stripes of the praescutum extending about to the antei'ior 

 margin of the sclerite, each deeply bifid at its anterior end ; apical tergites 



of the abdomen largely blackish T. ignobilis (p. 405). 



23. Male hypopygium with the ninth tergite elongate-cylindrical, strongly up- 

 turned; eighth sternite with the po.sterior margin tripartite and clothed 

 with yellow hairs; wings with a veriegated brov.n, gray, and wdiite 

 pattern {hehes group) 24. 



Male hypopygium with the ninth segment not strongly upturned 25. 



■24. Antennae of the male elongate, extending about to the base of the abdomen, 

 bicolorous T. hehes (p. 405). 



Antennae short in both sexes, extending about to the wing root, yellowish 



brown T. grata (p. 405). 



,25. Wings with the apex narrowly and irregularly darkened; narrow brown 

 seams along the cord; antennae dark brown; praescutum gray with 

 darker gray stripes, which are narrowly margined with dark brown; 

 pleura clear light gray; ninth tergite of the male hypopygium with the 

 posterior margin produced into two short, parallel lobes, one on either side 

 of the median line T. iroquois (p. 405). 



Wings not colored as above 26. 



