1930 ] 
N ematoproctus in North America 
167 
THE DOLICHOPODID GENUS NEMATOPROCTUS 
LOEW IN NORTH AMERICA 
By M. C. Van Duzee 
Buffalo, N. Y. 
This genus was established in 1857, Neue Beitr., Vol. v, 
p. 40, for two species. The type designation by D. W. 
Coquillett, Chrysotus distendens Meig. as Porphyrops an- 
nulatus Macq., the first species mentioned. 
Including the three species described here there are 
thirteen species known, three from Europe, two from Java, 
one from Africa and six from North America. 
The species of this genus differ from those of Argyra by 
having the first antennal joint bare above, third short, 
rather rounded, with a nearly basal arista. 
Dr. T. Becker places Nematoproctus, Argyra and its 
subgenus Leucostola in the Diaphorinse. Dr. J. M. Aldrich 
includes them in the Rhaphiinse, to which they seem to me 
to be much more closely related ; we have species of Argyra 
which are separated from the Porphyrops group of Rhap- 
hium by having from one to three small hairs on upper 
surface of first antennal joint and the arista not quite 
apical. Nematoproctus is separated from the subgenus 
Leucostola by the small third antennal joint with its dorsal 
arista and the longer hypopygial appendages of the male. 
Key to the species of North American N ematoproctus 
1. Orbital cilia and the beard yellow; tarsi of male 
plain (New Jersey) venustus Melander 
Orbital cilia and beard snow white 2 
2. Feet ornamented 3 
Feet plain 4 
