954 CuarLes Paut ALEXANDER 
91. 
92. 
93. 
94. 
95. 
96. 
is 
98. 
OOF 
basal segments light yellow, the remainder of the organ more or less distinctly bicolorous; . 
abdomen dull yellow, the tergites with a conspicuous dark brown stripe; wing 12 mm. 
[Proc. Acad. Nat. Sci. Phila., p. 475-476, pl. 16, fig. 5. 1915.]. (Plate XLVIII, 253, 
wing; Plate LIV, 346, lateral aspect of malehypopygium.)........ T. mainensis Alex. 
Coloration not as above, the thoracic stripes not dark brown; hypopygium not as 
ADOVE BGs tos Bice iseyeee jerseys 8 ols aie a kiae aia hs Gach shoes Ws nee rn 91 
Nasus short; cell 7st M2 of wings very small and pentagonal; male hypopygium with 
the ninth tergite usually tumid, unarmed or provided with‘horns; in species in which 
the tergite is not conspicuously swollen and tumid (7. parshleyi), the cell 1st M2 is 
small and pentagonal, as above; in species in which the cell 1st Me is longer 
(T. johnsoniana), the ninth tergite is tumid tho unarmed (bicornis group) ......... 92 
Nasus usually longer; cell /st M2 of wings not small and pentagonal; male hypopygium 
with the ninth tergite not tumid (translucida group).....................0.-0-. 96 
Ninth tergite (Plate LIL, 321) not tumid; eighth sternite very long, sheathing the ninth 
sternite beneath, the tip with two chitinized points on either side. [Proc. Acad. 
Nat. Sci. Phila., p. 510-512, pl. 17, fig. 23. 1915.) (Plate LV, 354, lateral aspect 
of male hypopygium. ) BS Vea aN aaRCae ENOL Nt yale aig 1 de T. parshleyi Alex. 
Ninth tergite tumid; eighth sternite shorter, not closely applied to ninth sternite for 
the entire length of the latter, the apex without chitinized points................ 93 
Ninth tergite (Plate LII, 320) with four lobes or horns. [Journ. N. Y. Ent. Soc., vol. 9, 
p. 112-1138. 1901.}| (Plate XLVI, 231, wing; Plate LV, 353, lateral aspect of male 
Hy OP YOUU) Pe I GME, AERC i ae UA a T. megaura Doane 
Ninth tergite with.two horns or) without horns. 20. 500.) .-2) eee 94 
No horns on the tergite (Plate LII, 318). [Proe. Acad. Nat. Sci. Phila., p. 505-506, 
pl. 17, fig. 20. 1915.]. (Plate LV, 351, lateral aspect of male hypopygium. ) 
T. johnsoniana Alex. 
Hornsion the tergite:. 5 022) i 54 i Es Sa, a 95 
Horns on tergite (Plate LIT, 319) directed upward. [16th Rept. State Ent. Ill., p. 78, pl. 6, 
fig. 4. 1891.] (Plate XLVI, 230, wing; Plate LV, 350, lateral aspect of ‘male hypo- 
PY STIS) arena a i et aie esa EM A on ee SR et ar T. bicornis Forbes 
Horns on tergite directed caudad or slightly ventrad. [Proc. Acad. Nat. Sci. Phila., 
p. 507-508, pl. 17, fig. 21. 1915.] (Plate LV, 352, lateral aspect of male hypopygium. ) 
T. morrisoni Alex. 
Caudal margin of ninth tergite (Plate LII, 315) with three prominent lobes, the median 
lobe acute; antennae bicolorous; body coloration light yellow, the thoracic stripes 
reddish brown; abdomen with a series of about four conspicuous, rounded, brown 
spots along the sides; wing 13.5 mm. Southern species. [Proc. Acad. Nat. Sci. Phila., 
p. 487-488, pl. 16, fig. 11. 1915.] (Plate XLVII, 240, wing.) ........ T. triton Alex. 
Caudal! margini of ninth tergite not trifid): 22/730: 22 ee ee eee 97 
Caudal margin of ninth tergite (Plate LII, 316) deeply notched, the lateral lobes pro- 
duced into long, slightly curved horns; outer pleural lobe a conspicuous curved hook; 
antennae bicolorous; body coloration ‘yellowish, the thoracic stripes very indistinct: 
wings yellowish; wing 17.2 mm._ [Proe. Acad. Nat. Sci. Phila., p. 493-495, pl. 16, 
fig. 15. 1915.] (Plate XLVII, 241, wing; Plate LIII, 328, eighth sternite; Plate 
LV, 349, lateral aspect of male Raat EM MAL) Sei 6 Ts tuscarora Alex. 
Male hypopygium not-as above! iss ole eo. ys aS ie eG ne Omen See 98 
Lateral lobes of ninth tergite (Plate LH, 310) broad, squarely truncated; antennae more 
or less distinctly bicolorous: coloration brownish yellow; wing 18 mm. ([Proc. Acad. 
Nat. Sci. Phila., p. 490-492, pl. 16, fig. 138. 1915.] (Plate XLVII, 242, wing.) 
te mingwe Alex. 
Lateral lobes of ninth tergite not squarely truncated, more or less pointed or 
TOUNGEM eB eS ei Bethe Re ale ie RTS Ae 99 
Wateral lobes of ninth tergite poimted ss... . a. 42h. sae ace eee eee 100 
Lateral! lobes of ninth tergite rounded! <\. 325445055 aa. one eeoen eee 102 
