28 ■ H. C. HUCKETT 



the apical bristles weak and directed apicad, and with a complete row of anteroventral bristles, 

 which increase in size apicad; hind tibia with five anteroventral, five anterodorsal, and three 

 posterodorsal bristles; a series of short setulae alongj)roximal half of posterior surface. Costal 

 thorn small; second section of vein M1+2 about twice as long as third section. Upper 

 calyptia covering the lower. Length, 4 mm. 



Locality. — 1 6 , Hempstead, Long Island, April 10, 192L 



Type. — In author's collection. 



Hy^emyia inconspicuus resembles H. cilicrura Rond., but can be dis- 

 tinguished from it by the following characters: the posterior apical bristle 

 of the fore tibia is weak and pointed; there is a posteroventral row of 

 bristles on the hind femur; and there is a partial series of posteroventral 

 hairs on the hind tibia. 



Hylemyia innocua Malloch 



1920 MaU. Trans. Amer. Ent. Soc, vol. 46, p. 186. 

 Localities. — 1 6 , Lake Ridge (near Ithaca), July 1, 1920; 5 6, 39, McLean Bogs (near 

 Ithaca), July 3, 1920; 16, Gloversville (collected by Dr. C. P. Alexander). 10 specimens: 

 7 males, 3 females. Figures 5, 56, 105, 176, on plates in this memoir. 



Hylemyia inornata Stein 



1898 Stein. Berl. Ent. Ztschr., (1897) vol. 42, p. 220. 

 Localities.— 1 6 , Coy's Glen, Ithaca, May 14, 1922; 1 9 , May 22, 1922; 1 9 , May 23, 

 1922; 16, 19, Ithaca, May 28, 1922; 1 6 , Ithaca, 19 — . 6 specimens: 3 males, 3 females. 

 Figures 13, 61, 110, on plates in this memoir. 



Hylemyia inornata Stein belongs to the group of closely allied forms 

 including marginata Stein, marginella Mall., spinilamellata Mall., piloseta 

 Mall., and setigera Joh. It most closely resembles setigera, from which 

 it may be separated by the following characters : the conspicuous golden 

 pollen of the abdomen; the distinct narrow dorsocentral vitta of the abdo- 

 men in the male; the appearance of the male genitalia. 



Hylemyia ithacensis sp. no v. 



Male. — Blackish species, with a bluish tinge. Head black; parafrontals, parafacials, and 

 cheeks silvery gray pruinose, velvety, with dark refiections. Antennae and palpi blackish. 

 Thorax blackish; viewed from above and behind, with a black, imiform, median vitta, and 

 broad lateral blackish markings on each side of the disk; humeral and notopleural callosities 

 with hghter grayish pollen; scutellum blackish. Abdomen, viewed from above and behind, 

 with whitish pollen; a black dorsocentral vitta, which is divided into blackish, subtriangular 

 spots, the latter merging anteriorly into the black tergal incisures. Legs black. Wings 

 slightly infuscated; veins brownish. Calyptrae white. Halteres yellow. 



Eyes separated, at narrowest part, by a distance not greater than diameter of anterior ocellus; 

 parafrontals contiguous. Parafacials narrow in profile, as in cilicrura; cheeks invaded along 

 ventral border by several setulae which reach almost to ventral margin of eye. On inner 

 surface of second antennal segment, a dorsal pair of tubercles and one or more ventral tubercles; 

 third antennal segment expanded somewhat from base, about equal in length to twice length of 

 second antennal segment; arista almost bare; second segment nearly twice as long as wide. 

 Thorax with numerous accessory setulae; three or four pairs of well-developed presutural 

 acrosticals; postsutural acrosticals arranged in pairs, and weaker than the presutural; post- 

 humeral bristles duphcated. Pra short, less than half length of the following bristle. Sterno- 

 pleurals, 2 : 3, the lowest bristle of each group appearing considerably weaker and shorter than 



