142 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



extending to anterior margin of center stripe, center stripe dull black; 

 the hairlike bristles along the sides of the oceUar triangle, and on 

 anterior margin of frons distinct; postvertical bristles incurved; 

 antennae of male shaped much as in the male of Phyllomyza securi- 

 comis, the third joint truncate at apex, its length distinctly greater 

 than its breadth; in the female the third joint is rounded and the 

 antennae are of normal size; arista pubescent, in male its length does 

 not exceed 1^ times that of the third antennal joint, in female its 

 length is about equal to from its base to second uppermost orbital 

 bristle; cheeks narrow, marginal bristles weak, anterior margins of 

 cheek produced, vibrissa slightly differentiated; proboscis chitinised, 

 its entire length equal to about three times the height of head, 

 geniculated; palpi large, spatulate, sparsely bristled; occiput almost 

 invisible on upper half. Mesonotom glossy black; two pairs of 

 dorso-centrals present, the pair of bristles between the posterior pair 

 distinct; pleurae glossy black; squamae brown; scuteUum glossy 

 black; the basal paii' of bristles much weaker than the apical paii*. 

 Abdomen glossy and like mesonotum covered with short black 

 setulae. Legs thickly covered with short setulose hairs. Wings 

 clear, costa, basal part of veins, and veins 1-3 brown, the others 

 indistinct, ventation as figure 7, Plate 4. Hal teres black. 



Length. — 1-1.5 mm. 



Originally described from Pennsylvania (Osten Sacken). Speci- 

 mens in U. S. National Museum collection are from District of Colum- 

 bia (collection Coquillett); Peaks of Otter, Virginia, July 26, 1906, 

 (W. Paine) ; "\Miite Mountains, New Hampshire, July, (S. H. Scudder) ; 

 Southern Illinois, (Robertson); and Kaslo, British Columbia, (R, P. 

 Currie). 



Genus MEONEURA Rondani. 



Meoneura Rondani, Prodr., vol. 1, 1856, p. 128. 



Anisoneura Lioy, Atti Inst. Veneto, ser. 3, vol. 10, 1864, p. 1314. 



Psalidotus primus Becker, Mitth. Zool. Mus. Berlin, vol. 2, pt. 3, 1903, p. 192. 



This genus may be distinguished from Agromyza by possession of 

 the following characters: Frontal triangle distinct; frons with two 

 anterior marginal bristles at center; lower two pairs of fronto- 

 orbital bristles incurved, upper two pairs curved outward (pi. 5, 

 fig. 11); vibrissae strong, the anterior pair consisting of an upper 

 and lower incurved bristle on facial ridge, the others carried back- 

 ward in a diagonal Ime from lower anterior angle to posterior upper 

 angle at near to edge of eye (pi. 5, fig. 10). There is also an addi- 

 tional bristle on lower part posteriorly; antennae as in Agromyza, 

 arista slightly pubescent; wings with costa to end of third vein; 

 fourth vein indistinct beyond cross vein; costa ciliated with short, 

 but distinct bristles to end of first vein (pi. 4, figs. 2, 3), 



