Kahl: The Dipterous Genus Leucophenga Mik. 381 



times the distance between tips of third and fourth veins, which are ahnost parallel 

 in their apical course, but by no means diverging; distance between anterior and 

 posterior cross- veins about one-third longer than the first section of third vein; 

 posterior cross-vein at right angle with fourth vein and at least one-third shorter 

 than the ultimate section of fifth vein; ultimate section of fourth vein, which is 

 much thinned and pale in its apical course, hardly less than two and one-half times 

 the length of the penultimate section. 



The fronto-orbital, vertical, and ocellar bristles of almost the same strength; 

 the two reclinate fronto-orbitals and the inner vertical almost equidistant, but the 

 upper reclinate bristle is evidently not as near to the lower reclinate as to the inner 

 vertical bristle; the upper reclinate (the uppermost fronto-orbital) situated as far 

 down as the lower ocellus; postverticals very minute, slightly cruciate; on lower 

 occipital orbit a small seta, differentiated from the setulae of the occipito-orbital 

 fringe; a minute setula between the two sternopleurals; the anterior dorso-central 

 small, not larger than the prescutellar pair, which is situated slightly nearer to the 

 scutellum than the posterior dorso-central; the presutural and the anterior supra- 

 alar weak; posterior postalar very minute; the distance between the two apical 

 bristles of scutellum not less than either of them to the nearest marginal bristles; 

 all the bristles and the minute setulee black, in certain lights with yellowish brown 

 reflection, except the apical setae of the abdominal segments, which retain the black 

 color. 



Habitat: Bolivia, Province del Sara, 350 meters above sea-level. 

 Type, a male, collected by Jose Steinbach, Carn. Mus. Ace. No. 5080. 



There are in the collection of the Carnegie Museum five other speci- 

 mens from the same locality as the type (one dated Nov., 1912) and 

 four from Las Juntas, Bolivia, Dec, 1913, all bearing the label Carn. 

 Mus. Ace. No. 5081, and all collected by Mr. Jose Steinbach. They 

 vary in the extension of the black marks on the dorsum of abdomen. 

 Two specimens, one labelled as is the type, the other from Las Juntas, 

 agree best with the type in the abdominal markings, but both have the 

 median spot on fifth segment extended to the apex of fourth segment 

 and the two large side-spots on third segment do not extend so close 

 to the base. One specimen from Las Juntas has the side-spots of 

 third segment coalescing in their entire width with the median spot. 

 Two specimens, one from Las Juntas and the other labelled as is the 

 type, and dated Nov., 1912, have the spots separated and not at all 

 coalescing. Three specimens, labelled as is the type, and one from 

 Las Juntas have the side-spots of fourth segment indicated merely by 

 a small brown dash or dot, the side-spots of the third segment more 

 coalescent with the median spot in three of them, but in the fourth 

 (from Province del Sara) the whole of the third segment above is black 

 and shows some black on each side of the second segment. The rays 



