Dec, I9IS-] Banks: Notes on Platypeza. 215 



smaller ones outside it. Wings hyaline, posterior cross-vein nearly twice its 

 length ^^rom the hind margin ; upturned section of fourth vein very short, but 

 little curved, third section plainly longer than the fourth ; auxiliary vein ends 

 considerably beyond anterior cross-vein ; abdomen short and broad ; halteres 

 dark. Length 2 mm. 



From Falls Church, Va., 30 Aug. Several females also from 

 Falls Church agree in general with these males. 



Platypeza mediana new species. 



Male. — Black; palpi and basal joints of antennas pale; abdomen shining 

 above, in some lights almost gray, but with two velvety black spots on middle 

 of fifth and sixth segments, that on the sixth is nearly square, that on the fifth 

 is much narrower and nearly pointed behind ; legs black, tips of coxae and 

 bases of femora pale, tarsi rather pale. Wings hyaline; posterior cross-veins 

 only a little more than its length from the margin ; fourth section of fourth 

 vein about two-thirds of third section, auxiliary vein ends a little beyond 

 anterior cross-vein ; halteres black. Scutellum with a large and small bristle 

 each side. Abdomen short, broad, and rather flat. Length 2.5 mm. 



From Falls Church, Va., 30 Aug. Differs from P. flaviconiis 

 in abdomen not wholly velvety black above. 



Platypeza elongata new species. 



Male. — Black ; antennae black ; palpi dark ; abdomen velvety black, except 

 last segment which is grayish ; legs black, including tarsi, but the anterior and 

 middle knees are pale ; halteres black. Wings hyaline ; posterior cross-vein 

 near margin ; upturned section of fourth vein very long, fourth section no 

 longer than second section, not one third as long as the third section ; auxil- 

 iary vein ends a little beyond the anterior cross-vein. Mesonotum with sub- 

 median rows of fine bristles ; scutellum with a long and one short bristle each 

 side. Abdomen very hairy, elongate, fully equal to the head and thorax 

 together. Length 3.3 to 3.8 mm. 



From Falls Church, and Glencarlyn, Va., in Aug. and Sept. P. 

 anthrax is said to have margins of second and third segments reddish, 

 and differs in minor points. 



Platypeza nitida new species. 



Male. — Black; face gray pollinose ; palpi pale; antennae blackish; legs 

 black, the tarsi but little paler; abdomen shining black, but second segment 

 velvety black, and last segment gray ; halteres dark. Wings hyaline ; posterior 

 cross-vein twice its length from the margin ; the upturned section of fourth 

 vein arises near margin ; the third section only a little longer than the fourth ; 

 auxiliary vein ends a long distance beyond the anterior cross-vein. Scutellum 

 with three short bristles on each side on margin ; abdomen rather broad and 

 flat. Length 2.5 mm. 



From Glencarlyn, Va., 24 June. 



