1 84 DIPTERA OF NORTH AMERICA. [PART III. 



Yellowish-ferruginous, with the thorax marked with yellow ; the anterior 

 half of the wings ochre-brownish, the posterior half almost hyaline, yel- 

 lowish. Long. corp. 0.44; $> cum terebra 0.52; long. al. 0.4 — 0.41. 



Of this species I possess a very well preserved, and, as it seems, 

 particularly fully-colored female, and two much paler males, pro- 

 bably having faded through long exposure. This difference in 

 coloring notwithstanding, I have not the least doubt that both 

 sexes belong to the same species. The condition of the specimens 

 induces me, however, to begin with the description of the female 

 and to add afterwards those characters by which the male speci- 

 mens differ from it. 



Female. — Head rather dark-yellow, of the ordinary Dacus-like 

 shape ; the front of considerable, and altogether equal, breadth ; 

 occipital bristles rather strong ; the lateral bristles in front of 

 them are wanting ; likewise the bristles generally inserted near 

 the ocelli ; the ocelli are approximated to the edge of the vertex 

 and close to each other; a black, biarcuate band runs from the 

 orbit of the eye on one side to that on the other, across the ocelli ; 

 immediately above the antennae there is another black band, not 

 reaching the orbits, the upper limit of which forms a less arcuate, 

 the lower limit a more arcuate curve. In consequence of the very 

 approximated position of the antenna?, the frontal lunule is more 

 isolated from the face, than is the case in any other of the Ortalidse 

 I am acquainted with. Antennas brownish ochraceous-yellow ; 

 the third joint comparatively long ; the arista with a short, but 

 very distinct, pubescence. The lower corners of the central por- 

 tion of the face rather blackish. The short, but rather broad palpi 

 ochraceous-yellow, brownish-black at the basis. The occiput 

 shows, not far from the edge of the vertex, a narrow, black cross- 

 band, not quite reaching the orbit of the eye. The thorax shows 

 a very variegated picture; the very broad middle stripe, running 

 from end to end, is of a brownish-ferruginous color, which changes 

 into black towards its posterior third ; this stripe is divided in 

 two by a blackish, rather indistinct longitudinal line ; it is sepa- 

 rated from the lateral stripes by a longitudinal line of ochraceous- 

 yellow pollen; the broad lateral stripes are crossed by the trans- 

 verse suture, w T hich is covered with pale ochraceous-yellowish 

 pollen ; the anterior portion of the lateral stripes is black and 

 leaves exposed only the pale yellow humeral stripe; the posterior 

 portion of the lateral stripe is black on the side turned towards 



