198 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Rhodesia tarsalis, n. sp. 



Female: Shining black, with short yellowish pile. Front 

 smooth, shining purple, ocellar bristles present, and a pair of 

 rather strong verticals differentiated from the fronto-orbitals ; 

 antenna' black, under side of third joint reddish brown ; face 

 shining black. Thorax with one humeral, two posthuraeral, 

 one supraalar, and one postalar bristle on mesonotum ; pleurte 

 smooth, halteres black. Abdomen shining black, compressed, 

 with yellowish pile. Legs shining black, coxcT and anterior 

 knees with a reddish cast, all tarsi light yellow. Wings hyaline, 

 the ultimate and penultimate sections of the fourth vein form- 

 ing quite an angle at the hind cross-vein, base of ultimate sec- 

 tion slightly undulate. Length, 2.75 mm. 



One specimen ; February, 



BORBORID^. 



BORBORLS. 

 (Meigen, lUig. Mag., II, 276.) 



Borborus marginatis, n. sp. 



Female : Front twice as wide as one eye, grayish pollinose 

 on sides, triangle reaching anterior margin, and yellowish pol- 

 linose, between the triangle and the grayish the front is opaque 

 brownish black, upon which is a row, on either side, of short 

 bristly hairs, also a row of similar hairs of gray orbits ; two 

 backwardly curved fronto-orbitals and one vertical bristle on each 

 side, ocellar bristles present. Face excavated, with a low me- 

 dian carina, subshining, grayish pollinose, yellowish in ground 

 color along oral margin, vibrissre strong. Cheeks and occiput 

 black, grayish pollinose, with short black hairs. Antenna' black, 

 third joint orbicular, reddish yellow underneath, arista micro- 

 scopically pubescent. Mouth-parts subshining black, clypeus 

 yellow anteriorly. Thorax black, yellowish pollinose, three 

 subpollinose vittse on mesonotum ; one humeral, two posthum- 

 eral, one supraalar, one postalar, and a pair of prescutellar 

 present ; besides these there are six rows of short bristles on 

 the mesonotum ; scutellum with four bristles. Sternopleura? 

 subshining ; halteres yellow. Abdomen black, grayish-yellow 

 pollinose; second segment somewhat elongate, remaining seg- 

 ments of equal length, except the fifth, which is a little shorter 

 than the fourth. Legs black, grayish pollinose ; front coxa) 



