The Ckane-Flies of New York — Part I 951 



68. Cell 1st Ml open by the atrophy of the medial cross-vein; wing of female 10 5 mm • 



coloration grayish brown, the thoracic stripes indistinct. [ripula aperta Alex. Can' 



Ent., vol. 50, p. G2, 191S. T. imperfecta Alex., preoccupied, Proc. Acad. Nat Sci 



Phila., p. 484-485, pi. 16, fig. 9, 1915.] (Plate XLVII, 235, wing.) ...T. aperta Alex" 



Cell 1st M« closed go 



69. Color of wings almost uniformly dark brown (females only) 70 



Color of wings hyaline, pale grayish, or yellowish 71 



70. Size small, wing of female about 8 mm. ; abdominal tergites uniformly dark brown thruout- 



cell 1st M-z pointed at its outer end, due to the extreme shortening of the medial cross- 



vein. [Journ. Acad. Nat. Sci. Phila., vol. 6, p. 151. 1829.] T. annuiicornis Say 



bize larger, wing of female over 10 mm.; abdominal tergites dark brown with broad 

 bright yellow, median triangles, the points directed forward; cell 1st M^ not pointed 

 at its distal end, the media! cross-vein of normal length, nearly as long as the petiole 

 of cf)l ^'- , [Proc- Acad. Nat. Sci. Phila., p. 476-479, pi. 16, figs. 7, 8. 1915.] (Plate 

 XLVIII, 244, wing.) 7^ taughannock Alex 



71. Color of thorax light gray or blue-gray, with distinct clear-cut brown or black stripes- 



body clothed with long, pale hair; wing over 14 mm. Northern species 72 



Color of thorax brown, yellow, or gray; if grayish {T. dejecta), the vAng is under 1'? mm" 



and the body is not clothed with long, pale hair 73 



72. Color of thorax dull light gray, with four light brown stripes; median vitta of the head 



indistinct; dorsal abdominal vitta narrow; eighth abdominal tergite of female with 

 the margins flattened and conspicuously expanded; tergal valves of the ovipositor 

 long, pale. [Proc. Acad. Nat. Sci. Phila., p. 482H184, pi. 21, fig. 85. 1915.] 



Color of thorax blue-gray, with the stripes almost black, broad, the median pair tending 

 to become confluent; median vitta of the head distinct; dorsal abdominal vitta broader 

 more diffuse; eighth abdominal tergite of female with the margins not conspicuously 

 expanded; tergal valves of the ovipositor smaller; wing pale grav, stigma dark brown- 

 antennae black thruout; ninth tergite of male deeply notched mediallv, the adjacent 

 lateral lobes broad, truncated, pale; outer pleural appendages broad, pale- wing 

 of male 14 mm. [Proc. Boston Soc. Nat. Hist., vol. 19, p. 42. 1876.] ' 



»o T\T 1 / 1 \ ^- besselsi O. S. 



76. Males (as known) y ^ 



Females (as known) Jqo 



74. Caudal margin of ninth tergite (Plate L, 288) with a compressed ' median lobe pro- 



jecting caudad of the short lateral lobes; distal end of cell 1st M2 pointed, cross-vein ?m 

 very short; size very small, wing of male under 8 mm.; antennae elongated, bicolorous- 

 thoracic stripes indistinct. [Journ. Acad. Nat. Sci. Phila., vol. 6, p 151 IS '9 ] 

 (Plate XLVIII, 243, wing; Plate LIII, 335, lateral aspect of male hypopygium.) 

 -,,,..., T. (innuHcornis Say 



Caudal margin of ninth tergite without a compressed median lobe projecting beyond 

 the lateral lobes; distal end of cell Isl Mo not pointed; size larger, wing of male 'over 

 10 mm n- 



75. Sclerites of ninth segment fused into a nearly complete ring; caudal margin of the tergite 



truncate with a broad, depressed, median lobe or with two approximated slender, 



parallel Icbes, one on either side of the median line 76 



Sclerites of ninth segment not fused, at least the tergite distinct; ninth tergite without 

 median lobes on the caudal margin gg 



76. Ninth tergite with two slender, finger-like lobes on the caudal margin' (fepiiroceMoZo 



group) '^ -j-j 



Ninth tergite with a single broad median lobe or with two short blunt lobes on the 

 caudal margin (perlongipes group) _ 7§ 



77. Antennal flagellar segments bicolorous, the basal swelling of each segment yellow the 



pedicel dark. [Berl. Ent. Ztschr., vol. 8, p. 62. 1864.] (Plate XLVI, 221, wing 

 Plate XLIX, 271, ninth tergite.) T. tephrocephala Loew 



