96 DIPTERA OP NORTH AMERICA. 



between the cross-veins is less than the length of the middle cross- 

 vein ; poisers tawny. 



Hob. Florida. (Mr. Doubleday.) 



7. T. mevarna WALK. 9. (Walk. List. etc. IV, p. 1023.) Fusca, 

 cinereo tecta, abdomine basi cinereo, apice nigro, palpis, antennis, pedi- 

 busque fulvis, alls albis apice fusco radiatis. Long. corp. 0.13. Long. 

 alar. 0.25. 



Body dark tawny, thinly clothed with tawny hairs, covered with 

 gray bloom, which has a tawny tinge on the breast ; head tawny ; 

 sides of the face without bristles ; epistoma not prominent ; eyes 

 brassy, adorned with green and purple ; forepart rather flat, its 

 facets larger than those elsewhere ; sucker tawny, clothed with 

 tawny hairs ; palpi tawny, beset with tawny bristles; feelers tawny, 

 a little shorter than the face ; third joint nearly linear, downy, 

 very slightly rising on the upper side at the tip, which is trun- 

 cated, full twice the length of the second joint ; bristle black, 

 tawny and rather thick at the b'ase, rather more than twice the 

 length of the third joint ; abdomen obconical, tawny, gray at the 

 base, black and tapering towards the tip, much longer than the 

 chest ; legs tawny, clothed with short black hairs ; claws black ; 

 wings white, adorned near the tip with a large brown spot, which 

 is darkest along the foreborder, and sends forth nine rays from its 

 paler part; it includes two distinct white dots, and along the 

 border are others incomplete ; it has a tawny tinge above the 

 middle cross-vein, which is separated from the lower cross-vein by 

 very little less than the length of the latter ; both are perpendicu- 

 lar; wing-ribs tawny; veins black, tawny towards the base; 

 poisers tawny. 



Hob. Florida. (Mr. Doubleday.) 



8. T. mexicana WIED. . (Auss. Zw. II, 511.) Fuscano grisea; 

 pedibus luteis ; alis bruimeis, basi guttisque maximam partem margina- 

 libus limpidis. Long. corp. 0.09. 



Antenna? reddish yellow ; face paler ; front of a more intense 

 yellowish red; mesothorax brownish-gray; abdomen more blackish- 

 gray, distinctly pubescent with yellow ; bases of the wing hyaline, 

 only with two brown streaks between the costa and the next 

 vein ; the remainder of the wing, about three-fourths of it, of a 

 saturated brown ; the anterior border with two pairs of obliquely 



