NO. 2344. SUPERFAMILY TIPVLOIDEA— ALEXANDER AND McATEE. 401 



26. Wing apex infuscated; a dark spot at the origin of the sector; ninth tergite 



of the male hypopygium prominent, deeply notched, the lateral lobes 



acute 26a. 



Not as above; if the wing-pattern is as described {valida gi-oup), the size is 



much larger (wing of male 20 mm.) 27. 



26a. Ninth tergite with the lateral horns very long, tapering gradually to the 

 acute tips ; inner pleural appendage a narrow, flattened blade that runs out 

 into a long acute point, the outer edge with a single, conspicuous ventral 



tooth ; gonapophyses very long and delicate, sinuous submaculata (p. 406). 



Ninth tergite with the lateral horns short to very short, tapering abruptly 

 to the acute tips; inner pleural appendage a short, flattened blade with 

 the apex truncated or rounded and without a conspicuous ventral tooth ; 

 gonapophyses stouter, not sinuous maUocJii (p. 406). 



27. Large, wing of male 20 mm. ; wings with apices light or dark brownish 



gray; male hypopygium greatly enlarged. {raUda group.) 28. 



Smaller, wing of male under 18 mm. ; wings with a heavy brown and white 

 or gi'ay and white pattern, female abdomen very long, the valves of the 

 ovipositor serrated T. longiventris (p. 405). 



28. Ninth tergite with the lateral lobes slender and produced; eighth sternite 



without a long brush of hairs; wing apex darker, brownish. (Regional.) 



T. valida Loew. 



Ninth tergite with the lateral lobes shorter and less evident; eighth sternite 



with a tuft of long yellow hairs; wing apex light gray. (Regional.) 



T, hirsuta Doaue. 



29. Male light yellow, the thoracic stripes indistinct; antennae elongated, bi- 



colorous; distal end of cell 1st if 2 pointed; ninth tergite with a com- 

 pressed median lobe ; female conspicuously different, the body and wings 



brown; size very small, wing under 8 mm T. ammlicornis (p. 403). 



Characters not as above 30. 



30. Antennae bicolorous, the basal enlargement of each segment of the flagellum 



yellow, the rest black T. tephrocephala (p. 407). 



Antennae not as above 31. 



31. Sclerites of the ninth segment of the male hypopygium fused into a nearly 



complete ring; caudal margin of the tergite with a broad, depressed 



median lobe; antennae bicolorous; legs very long T. perlonf/iijct (p. 406). 



Sclerites of the ninth segment not fused, at least the tergite distinct; no 

 such median projections on the tergite 32. 



32. Ninth tergite large, the caudal margin with a small rounded notch on 



either side of a small, acute median tooth ; eighth sternite with a broad, 

 fleshy, lateral lobe on either side, diiected proximal ; median area of 

 the sternite with a prominent chitinized tooth on either side of the median 



line; size large wing about 18 mm. ; antennae bicolorous 



T. nmhrosa (p. 407). 



Ninth tergite not as described ; eighth sternite, if with fleshy lobes (aus- 



tralis, valida) without two chitinized teeth on the median area 33. 



33. Size large (wing over 20 mm.) ; male hypopygium greatly enlarged; eighth 



sternite with elongate lateral lobes and a flattened median lobe, {valida 



group.) 34. 



Size smaller, wing under 18 mm.; male hypopygium not greatly enlarged; 

 eighth sternite not as above 35. 



34. Ninth tergite with the lateral lobes slender ; eighth sternite without a long 



brush of hairs. (Regional.) ^^T. vnlidn Loi^vr. 



181404— 21— Proc.N.M.vol.oS 26 



