200 Journal New York Entomological Society. [Vol. xvi. 



tibiae different, as well as the color of the abdomen. From P. ab- 

 dominalis Fall., which it resembles in color, it can be distinguished by 

 the bristly third vein, and from P. thoracica Meig. by its dark hal- 

 teres, non-thickened costal vein and orange-red abdomen. The dif- 

 ference in the chaetotaxy of the hind tibiae in the two specimens 

 before me is puzzling, but careful scrutiny reveals no other distinguish- 

 ing differences of importance and I am convinced that both belong to 

 a single species. 



Phora occidentalis, new species. 



Female. Length 2.4-2.6 mm. Black, the anterior trochanters and knees 

 honey-yellow. Wings infuscated, especially anteriorly and along the veins. Head 

 rather small, the front very slightly broader than high, polished and impunctured. 

 Lower pair of reclinate setae small, widely separated ; second row of four scarcely 

 above the lower pair, equidistant and forming a nearly straight line ; third row 

 straight; occipital row as usual. Antennre small, rounded, the arista strongly pu- 

 bescent. Palpi slender, bristly only toward the tips. Proboscis short, membranous. 

 Cheeks each with several macrochret;e. Mesonotum elongate, shining, sparsely hairy, 

 with one pair of dorsocentral macrochretce. Scutellum with four marginal bristles, the 

 lateral pair however considerably weaker than the median. Abdomen as usual, the 

 second segment not elongated. Surface of abdomen sparsely hairy. Legs short but 

 slender ; anterior tibias without bristles ; middle ones with a pair of delicate bristles 

 at the basal third, hind pair with a single weak bristle just before the middle. Wings 

 infuscated, especially on the anterior half and along the course of the veins, narrow in 

 outline. Costal vein reaching well beyond the middle of the wing, with short, sparse, 

 and delicate cilia, quite distinctly thickened on its apical half. First vein ending 

 three fourths as far from the tip of the third as from the humeral cross-vein ; second 

 ending midway between the third and first, originating very far basally, nearer the 

 origin of the fifth than of the fourth vein, and just opposite to the tip of the first ; third 

 vein bristly as far as the furcation which is about at its middle ; fourth vein rather sharply 

 curved at its extreme base, straight elsewhere, and ending well before the wing tip ; 

 fifth nearly straight ; sixth sinuate ; seventh very distinct at the base, but not attaining 

 the wing margin. Halteres black. 



Two specimens, both sent me by Professor A. L. Melander, one 

 from Moscow Mt., Idaho, June 17, 1904, and the other from Pull- 

 man, Wash., May 5, 1907. 



This is a very peculiar species owing to the great length of the 

 fork of the third vein. This peculiarity will at once serve to dis- 

 tinguish it from any other described species that I have seen. 



Plastophora Brues. 



Brues, Ann. Mus. Nat. Hung., Ill, p. 551 (1905). 



Coquillett, Canadian Entomologist, XXXIX, p. 208 (1907) {Pseudacteon). 



Brues, Entomological News, XVIII, p. 430 (1907). 



