A Systematic Study of the Anthomyiinae of New York 35 



Hylemyia trichodadyla Rondani 



1820 Musca dnerella Fall. p. p. Dipt. Suec. Muse, p. 77. 



1824 Micsca floralis Fall. var. g and d. Muse, p. 71. 



1826 Anihomyia platura Meig. p. p. Syst. Beschr., vol. 5, p. 171. 



1838 Anihomyia liturata Meig. Syst. Beschr., vol. 7, p. 329. 



1838 AnthomyzQ, striolata Zett. p. p. Ins. Lapp., p. 684, no. 103. 



1845 Aricia angustiventris Zett. Dipt. Scand., vol. 4, p. 1542. 



1845 Aricia florilega Zett. p. p. Dipt. Scand., vol. 4, p. 1555. 



1866 Chortophila trichodadyla Rond. Atti Soc. Milano, vol. 9, p. 164. 



1884 Anihomyia sancti- jacobi Bigot. Ann. Soc. Ent. France, ser. 6, vol. 4, p. 296, no, 2. 



Records. — Earliest: Hempstead, Long Island, June 5, 1921. Latest: McLean Bogs (near 

 Ithaca), September 11, 1920. 44 specimens, all males. Figures 3, 54, 106, on plates in this 

 memoir. 



The writer has a male and a female specimen of Hylemyia trichodadyla, 

 which were reared from turnips at Ottawa, Ontario, on August 21 and 14, 

 respectively. The specimens were kindly furnished for identification 

 by Dr. McDunnough, of the iDivision of Entomology at Ottawa. The 

 female of trichodadyla has always proved inseparable from that of cili- 

 crura, and ia close study of the reared specimen now available has aided 

 but little in solving the problem. In the reared specimen of trichodadyla, 

 the apices of the veins Ri+5 and M1+2 converge somewhat more than 

 is usual in cilicrura, and the hind tibia lacks the preapical setula on the 

 posteroventral surface, which is very commonly found in cilicrura. 



In comparing the reared specimen with a series of female specimens that 

 had been collected at the same place and time as trichodadyla males, it 

 was found that, of the twelve specimens examined, ten lacked the pre- 

 apical setula on the hind tibia. Similarly, a series of twenty-two speci- 

 mens of cilicrura was examined, which revealed that eighteen possessed 

 the preapical setula, two proved uncertain cases, and two lacked the 

 preapical setula. 



Hylemyia trivittata Stein 



1898 Pegomyia trivittata Stein. Berl. Ent. Ztschr., (1897) vol. 42, p. 246, no. 10. 



Records. — Earliest: Lakeville, Long Island, July 30, 1921. Latest: Hempstead, Long 

 Island, September 11, 1921. 130 specimens: 58 males, 72 females. Figures 18, 70, 108, 

 174, on plates in this memoir. 



Hylemyia unidorsalis sp. nov. 



Male. — Black, with dense grayish pruinescence. Head blackish; parafrontals, parafacials, 

 and cheeks whitish pruinose, with dark reddish brown reflections. Antennae and palpi 

 black. Thorax blackish, the presutural and humeral regions, when viewed from above 

 and behind, with light grayish pollen; a uniform blackish median vitta, and traces of sublateral 

 vittae; postsutural area and scutellum blackish, with indistinct darker vittae. Abdomen, 

 viewed from above and behind, with dense grayish white pruinescence; a uniform black 

 dorsocentral vitta, and black anterior tergal incisures; hypopygium subshining. Legs black. 

 PulviUi whitish. Wings clear; veins brownish. Calyptrae whitish. Halteres yellowish. 



Eyes separated, at narrowest part, by a distance equal to diameter of anterior ocellus; 

 parafrontals contiguous; dorsal series of postorbital setulae longish, equal in length to vertical 

 and ocellar bristles. Parafacials and cheeks, in profile, narrow, in breadth less than width of 



