518 PROCEEDINOS OF THE NATIONAL MUSEUM. vol.43. 



two-thirds as large as the upper, upper pair occupying one-third the 

 breadth of frons, the under about one-fourth, center pair of first row 

 bristles much below the outer pair, in transverse line with upper post- 

 antennals and about midway between them and the eye margin, 

 second row about one-sixth the distance from the ocelli to upper post- 

 antennal bristles, antennae brownish yellow, rather small, arista about 

 one-fourth longer than frons, very shortly pubescent, palpi yellow, of 

 normal size and numerously bristled; mesonotum slightly sliining, 

 the surface with numerous short hairs, two bristles on posterior 

 margin, pleurss black-brown, distinctl}?^ shining, bare, scutellum with 

 two bristles and two very weak hairs anterior to them; abdomen 

 opaque black, segments with a few short scattered hairs ; legs yellow, 

 hind pairs, except apices of coxae, trochanters, and bases of femora 

 brown, setulae as in furtiva, but those on hind tibiae stronger; wings 

 narrow, slightly browned, costa to distinctly beyond middle, first 

 division as long as next two, third nearly half as long as second, fringe 

 nearly as long as fork of third vein, close and fine, but longer than in 

 furtiva, fourth vein rounded at base, not reaching to tliird, recurved 

 at apex and ending at distinctly in front of wing tip ; halteres black. 



Length, 1^ mm. 



Type.— Cat. No. 15266, U.S.N.M. 



Locality. — One female, Plummers Island, Maryland, August 3, 1912 

 (J. R. Malloch). 



In the table given for Group D this species runs down to furtiva 

 Aldrich, from which it may be separated by the position of the frontal 

 bristles, the narrow wings, the longer third costal division and the 

 longer fringe. 



Named in honor of Mr. E. A. Schwarz, the president of the Wash- 

 ington Biologists Field Club, who has done so much to make Plum- 

 mers Island one of the best known entomological localities in America. 



Genus PHALACROTOPHORA Enderlein. 



This genus was created by Enderlein for the reception of a single 

 species, hruesiana Enderlein,^ and the only character given for its 

 separation from Aphiochseta is "frons with only marguial bristles." 

 No mention is made of how many rows of bristles there are on the 

 frons, and without a clear understandhig of this it is impossible to 

 say whether epeirse Brues and longifrons Brues belong to the genus 

 or not. Brues has indicated that they do belong hero,^ but if that 

 should be the case then some other species of American Apliioclisetse, 

 including atlantica Brues and picta Lehm, should also be considered 

 as congeneric. The frontal bristles in the first row are subject to 

 very considerable variation in the matter of position, and tliis is the 

 more pronounced when the frons is elongated. It is the rule that 



1 Stett. Ent. Zeit., 1912, p. 21. ^ psyche, vol. 19, 1912, N o. 4, p. 135. 



