152 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



PHYTOMYZA LACTEIPENNIS, new species. 



Female. — Entirely black, subshining; halteres yellow, knobs white; 

 tarsi yellowish, darkened at apices. Wings milk white, costa and 

 third vein brownish yellow, first and second veins yellow, the other 

 veins indistinct. 



Frons with center stripe opaque, the narrow orbital stripes, and 

 ocellar region glossy; breadth of frons one-third the width of head, 

 the sides slightly divergent posteriorly; orbits in type-specimen de- 

 nuded of bristles, but evidently normally with three pairs present; 

 face concave in profile, lower margin slightly produced; cheeks nar- 

 row anteriorly, much broadened posteriorly, at broadest part one- 

 third as high as eye; antennae small, third joint with an acute upper 

 angle at apex, but not so distinctly produced as in Cerodontha; arista 

 bare, distinctly swollen at base, the terminal section tlireadlike; palpi 

 small, bare, black; proboscis brown, of normal shape. Mesonotum 

 with slight whitish pollinosity; three pairs of dorso-centrals present, 

 the anterior pair weak; disk with numerous short setulse; no distinctly 

 differentiated bristles between the posterior pair of dorso-centrals; 

 pleurae witli the normal bristles; scutellum with four subequal mar- 

 ginal bristles, disk bare. Abdomen shining; lateral margins of all 

 segments with bristles, the last segment with noticeably long post- 

 marginal bristles ; ovipositor glossy black. Legs short, their surfaces 

 with very short black hairs. Wings with first and second costal divi- 

 sion subequal, thii'd distmctly, but not greatly, shorter than second, 

 third vein ending well in front of wing tip. 



Length. — 1.5 mm. 



Type.— C&t. No. 15750, U.S.N.M. 



Locality. — Mesilla Park, New Mexico (C. N. Ainslie), Webster No 

 5050. 



