148 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



RHICNCESSA TEXANA, new species. 



Female. — Black-gray, with pale gray dusting, opaque. Head with 

 frontal stripe reddish yellow, orbits and triangle whitish, face, cheeks, 

 and antennae yellow, upper margin of third antennal joint brown; 

 cheeks silvered on upper half; palpi yellow, proboscis brownish yel- 

 low. Mesonotum slightly brownish on disk, and at some angles 

 with faint indications of two brown stripes. Second abdominal 

 segment almost entirely yellow, other segments with apices narrowly 

 pale. Legs yellow, fore femora distinctly blackened, posterior pairs 

 browned on middle, last two tarsal joints blackened. All bristles 

 black or brown. 



Frontal triangle very short, ocellar bristles widely divergent; 

 orbits narrow, the inner orbital row of setulse regular, of moderate 

 strength, incurved, the orbital bristles four in number; cruciate 

 frontal setulae consisting of about four pairs of moderate length; 

 antennal arista hairlike, short, not longer than anterior width of 

 frons, bare; eyes about one-third higher than long; cheeks about 

 one-third as high as eye; marginal cheek bristles of moderate strength, 

 upturned, in a single row, the vibrissa not differentiated. Mesonotum 

 with four pairs of post-sutural, and two pairs of presutural dorso- 

 centrals, between which are situated about four rows of short black 

 setulae. Legs with surfaces covered with numerous black setulse, 

 which are bristle like on the ventral surfaces of all femora towards 

 apices. Wings clear, veins yellowish ; veins 2-3 divergent, 3-4 slightly 

 convergent apically; outer cross vein at nearly twice its own length 

 from apex of fifth. Halteres yellow. 



Length. — 2 mm. 



Male. — Similar to female though smaller, darker in color, particu- 

 larly that of the femora, and wing veins. The outer cross vein is at 

 more than twice its own length from end of fifth vein. 



Type and allotype.— Csit. No. 15807, U. S. N. M. 



Type-locality.— Corpus Christi, Texas, April 12, 1906 (F. C. 

 Pratt). Locality of paratype: St. Augustine, Texas, March 22, 

 1908 (E. S. Tucker). 



This species may be distinguished from albula Loew, by its darker 

 coloration, and the fact that all the bristles are brown, or black, and 

 not yellow, or white, as in albula. Rhicnoessa cinerea Loew, of 

 Europe, is closely related to this species, but has only two rows of 

 setulae between the dorso-centrals on the mesonotum. It has also 

 some other minor differences from texana. 



PARALEUCOPIS, new genus. 



This genus comes very close to Leucopis Meigen, but may be 

 distinguished from it by the eyes being distinctly longer than high; 

 the third antennal joint diskUke; the second joint of arista but 

 shghtly longer than its diameter; the mesonotum having only one 



