372 Annals of the Carnegie Museum. 



Description: Head with front almost orange-yellow, in certain oblique lights 

 white, and the fronto-orbital stripes concolorous; front as high up as the upper 

 fronto-orbital bristle of almost equal width, rather broad, one-third as wide as the 

 head and with the median rows of hairs yellow; antennae and lower occiput pale 

 yellow; the upper concave occiput blackish with the orbits broadly yellow; face 

 grayish white with a very slight, transversely convex carina; third joint of antennae 

 almost twice as long as wide, evenly rounded at apex; arista with basal half yellow, 

 the apical half and the rays dark brown; the rays about eight above and about four 

 below; palpi prominent, quite broad, black with small setulae on lower side to apex; 

 cheeks extremely narrow, hardly perceptible. 



Mesonotum and scutellum rather dark brown-red, very slightly shining, the 

 former with its minute setulae changing to red or black in different lights. The 

 scutellum strongly convex, its apical margin and underside yellow; nietathorax 

 shining, dark honey-yellow; the pleura pale brownish red; legs yellowish, the an- 

 terior pair somewhat paler; middle and posterior tibiae, at least, with a minute 

 pre-apical bristle, differentiated from the very minute tibial setulae; halteres yellow. 



Abdomen with dorsum opaque black, slightly shining apically, the small black 

 setulae appearing in certain lights pronouncedly reddish, especially on the apical 

 segments; the small first segment and venter yellow, the latter with some rather 

 long hairs on each segment; second dorsal segment with a black, transverse spot at 

 each corner of the yellow base and behind it a transverse black band, the anterior 

 edge of which is concave in the middle and its posterior border reaching as far as 

 the pre-apical row of the longer setulae, behind which row the segment is silvery- 

 white; the base of the third segment is narrowly white, and silvery in certain lights; 

 the hypopygium is reddish brown. 



Wings distinctly pointed, yellowish hyaline; the yellowish more evident on the 

 anterior half, the hyaline on the posterior half; a light brown spherical spot on anal 

 vein; a large spot at base and apex and a transverse band between them, all dark 

 brown; the outlines of the two large spots and the crossband are as follows: be- 

 ginning at the apex of the first vein, the outline of the brown basal spot follows the 

 first vein to the junction of the second and third veins, crosses the first basal cell 

 into the middle of the discal cell, along the middle of which it extends to a little 

 beyond the anterior cross-vein, then parallel with this cross-vein to the third vein, 

 following it to the anterior cross-vein, whence it runs straight to the second vein 

 and thence obliquely to the apex of first vein; the outline of the brown apical spot 

 begins at costa a little beyond the apex of second vein, runs slightly concave to the 

 third vein and thence to the apex of third vein in an evenly convex curve, reaching 

 posteriorly beyond the middle of the first posterior cell, and is bordered anteriorly 

 by the costa; the brown of this spot is diluted in the region of the costa and be- 

 comes more intense along the third vein; the median transverse band is apparently 

 made up of two spots, the anterior one large, oval, directed longitudinally with its 

 tip towards the apex of the wing, the posterior one is transverse scarcely half as 

 wide as the former, and both spots join each other broadly in the middle of the first 

 posterior cell; the outline of the band runs from apex of second vein in an oblique, 

 convex curve, inwards to the middle of first posterior cell, then outwards in a convex 

 curve across the fourth vein, continuing in a slightly concave curve to the apex of 

 the fifth vein; the inner outline of the band begins at the middle of the penultimate 



