84 DIPTERA OF NORTH AMERICA. 



17. T. seriata LOEW. . (Tab. II, fig. 18.) Flava, alis concoloribus, 

 per maculas minntas nigricantes, seriatim dispositas, reticulatis et nigro- 

 limbatis. 



Yellow ; wings of the same color, margined with black and reticulated 

 with small blackish spots, arranged in longitudinal rows. Long. corp. 

 0.24. Long. al. 0.260.27. 



Rather bright yellow, quite unicolorous, the hairs and bristles 

 also yellow, the latter, however, appearing brown when seen in 

 n certain light. Front rather broad. Face descending rather 

 straight, strongly excavated, however, in its middle. Proboscis 

 short ; palpi rather broad and short. Scutellum with four bristles. 

 The wings are proportionately long, and of very equal breadth. 

 Their yellow ground color is rather obsolete in the middle line of 

 the cells and on the posterior border. The reticulation of the 

 greater part of the wings is effected by blackish angular specks 

 arranged in two rows between each two veins ; only the axillary 

 angle has a connected blackish-gray reticulation formed by clear 

 drops. Immediately before the tip of the auxiliary vein begins the 

 black margin of the wing, which encompasses the apex and pro- 

 ceeds to the axillary angle, growing gradually paler in its progress, 

 and meeting several interruptions ; the most remarkable of these 

 interruptions are a rather hyaline spot immediately beyond the 

 tip of the first longitudinal vein, and a row of similar round spots 

 along the posterior border, the two first of which in the second 

 posterior cell, the following more frequent towards the axillary 

 angle. The third longitudinal vein bears very distinct bristles 

 from its base as far as the small transverse vein. The small trans- 

 verse vein is nearly at the end of the second third of the discal 

 cell. The posterior transverse vein is not cjuite perpendicular. 

 The hind angle of the anal cell is prolonged into a moderately 

 long point. 



Hob, Middle States. (Osten-Sacken.) 



IS. T. Solaris LOEW. 9 . (Tab. II, fig. 19.) Cana, capite pedibusque 

 luteis. puncto humeral! et altero ante alarum basim flavis, alis albohya- 

 linis, macula magna subapicali nigra, biguttata et radios octo emittente, 

 ornatis. 



Whitish gray ; head and legs luteous, a dot on the shoulder and another 

 before the base of the wings yellow ; wings whitish hyaline, with a sub- 



