152 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 49. 



described herewith, while differing considerably in the chaetotaxy of 

 the head, is in every other respect so obviously congeneric with 

 varipes, the type of the genus, that I have no hesitation in placing it 

 in Pseudodinia. 



PSEUDODINIA POLITA, new species. 



Female. — Glossy black. Head black; frons shining; arista yel- 

 lowish at base; palpi brown; proboscis yellow. Body without 

 pruinescence. Legs yellow; coxae brownish-black; femora, except 

 the apices, black. Wings yellow at base, clear; veins brown. 

 Squamae white, fringe concolorous. Halteres yellow, knob lemon- 

 yeUow, hairs and bristles black. 



Frons about twice as long as broad, slightly narrowed anteriorly; 

 postvertical bristles small; ocellar bristles very weak, lying close to 

 surface of frons; the normal two pairs of orbital bristles very weak, 

 ahnost indistinguishable, and placed far back on frons, the lower well 

 above middle; transverse depression distinct and shallow; frontal tri- 

 angle slightly indicated; antennae small, third joint rounded apically, 

 slightly longer than broad; arista rather thick, tapering at base, 

 almost bare; cheek linear, marginal hairs weak; vibrissae absent; 

 eyes large, distinctly higher than long. Mesonotum with two pairs 

 of dorso-centrals ; discal setulae short and numerous, about 12 irregu- 

 lar rows between dorso-centrals; basal scutellar bristles weaker than 

 apical; mesopleural bristle strong. Fore femora with black bristles 

 on the postero-ventral surface; mid tibiae with apical spur; all tarsi 

 shghtly thickened. Wing veins 3 and 4 divergent apically; inner 

 cross vein at middle of discal cell; last section of fifth vein about 

 two- thirds as long as penultimate section of fourth; last section of 

 fourth twice as long as preceding section; sixth vein to near wing 

 inargin. Length, 2.5-3 mm. 



The male agrees with the female in color and chaetotaxy. The 

 hypopygium is small and knoblike, turned down and slightly for- 

 ward under the abdomen, and is in general appearance very much 

 like that of Agromyza parvicornis Loew. 



Type-locality. — Centerville, Illinois, August 17, 1914, by sweeping 

 vegetation on the bank of the Sangamon River (C. A. Hart and J. R. 

 Malloch). Paratype, Urbana, September 30, 1914 (J. R. Malloch). 

 This species may be separated from the 3 previously described species 

 by the entirely yellow tibiae. On September 30 I took a single 

 female of P. nitida Melander at Urbana. 



Paratype.—Csit. No. 19395, U.S.N.M. 



