470 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.4?,. 



the hind tibiae are stronger than mjlava, and the setulse (8-10) are 

 weaker and much more widely placed ; the third vein is much further 

 from the costa at its base than mjlava and the costal cells are thus 

 much wider than in that species ; halteres dusky yellowish-brown (in 

 one specimen yellowish). 



Length, IJ mm. 



Two males and one female, Bayamon, Porto Kico (A. Busck) . 



Closer in general characters to scalaris Loew, but the very small 

 anterior scutellar hairs separates it at once in both sexes from that 

 species. 



Type.— C&t. No. 14857, U.S.N.M. 



APHIOCHJETA ATLANTICA Brues. 



Yellow except tips of hind femora and anterior lateral corners of 

 abdominal segments; frons honey yellow, thickly covered with fine 

 black hairs, ocellar tubercle and median furrow present, four post- 

 antennal bristles of nearly equal size and placed in a curve, the center 

 pair of bristles directly underneath the outer pair of front row and 

 much below them; antennae yellow, arista pubescent; palpi very 

 small; thorax somewhat shining, with black pubescence; two 

 scutellar bristles; second to fifth abdominal segments with lateral 

 spots, sixth black; bristles on second segment weak, hind tibiae 

 distinctly ciliated with setulse on postero-dorsal surface; costa 

 extending to middle of wing, with closely placed, veiy short bristles, 

 first vem ending a little nearer the tip of third than to the cross vein. 



Length, 1.75-2.5 mm. 



One specimen "from rotten Aletia, Sept. 25th '80," seems to belong 

 to this species. The arrangement of the frontal bristles is as given 

 by Brues, but the color is rather different, and there are two anterior 

 hairs on scutellum as well as the two bristles. I have not seen Brues's 

 species, and the description is not clear enough on certain points to 

 enable one to separate it from any closely allied forms. In any case 

 if the above specimen is not atlantica it must belong to an undescribed 

 species, and I prefer to leave it this way rather than to describe it as 

 new when it may really belong here. 



APHIOCH^iETA INCISA, new species. 



Female. — Yellow; frons dull black, about as long as broad, lower 

 post-antennal bristles very small, antennae black, arista black, longer 

 than frons, distinctly pubescent, palpi yellow, normal; thorax 

 reddish yellow, scutellum with two bristles, abdomen brown, apices 

 of all segment and base of second segment laterally yellow, several 

 short bristles on lateral margins of second segment, a transverse 

 incision from either side, not meeting in center, at about one-third 

 from base of fourth segment makes it appear as if the fourth segment 

 is very short (as in ciliata Meigen) ; legs dusky yellow, hind femora 



