14 H. C. HUCKETT 



Hammomyia maculata Stein 



1898 Stein. Berl. Ent. Ztschr., (1897) vol. 42, p. 229, no. 1. 

 Locality. — 1 9 , Ithaca, 19—. 



Hammomyia marylandica Malloch 



1920 Mall. Trans. Amer. Ent. Soc, vol. 46, p. 185. 



Locality. — 2 6, 39, Baiting Hollow, near Riverhead, Long Island, May 13, 1923; 12 6 , 

 May 18, 1923; 36, 2 9, May 20, 1923; 2 6, May 27, 1923. 24 specimens: 19 males, 5 

 females.- 



Hammomyia paludis Johannsen 



1917 Joh. Ent. News, vol. 28, p. 323. 



Records. — Earliest: Glen Head, Long Island, April 5, 1921. Latest: Ithaca, July 1, 1917. 

 30 specimens: 19 males, 11 females. Figures 44, 91, 136, 183, on plates in this memoir. 



Hammomyia unilineata Zetterstedt 



1830 ILeucophora floralis Rob.-Desv. Essai Myod., p. 563, no. 2. 



1838 Anthomyza unilineata Zett. Ins. Lapp., p. 675, no. 63. 



1901 Anthomyza buccata Pand. nee Fall. Rev. Ent. France, vol. 20, p. 301, no. 5. 



Localities. — 16, Glen Head, Long Island, April 14, 1921; 16. Taughannock Falls, near 

 Ithaca, April 21, 1917 (collected by R. C. Shannon); 2 9, Valley Stream, Long Island, April 



27, 1921; 1 9 , Ithaca, May 1, 1915; 1 6 , May 2, 1900; 1 6 , Moshulu, June 18, (Amer. 



Mus. Nat. Hist.). 7 specimens: 4 males, 3 females. Figures 46, 89, 134, 185, on plates 

 in this memoir. 



Hammomyia unilineata is larger than H. paludis, and possesses stronger 

 and more abundant bristles and hairs. 



Genus Hydrophoria Robineau-Desvoidy 



1830 Rob.-Desv. Essai Myod., p. 503, no. 11. 



1830 Rob.-Desv. Essai Myod., p. 527, no. 21. Zaphne. 



1893 Pokorny. Wien. Ent. Ztg., vol. 12, p. 60. Acroptena. 



1918 MaU. Trans. Amer. Ent. Soc, vol. 44, p. 296. 

 1920 MaU. Canad. Ent., vol. 52, p. 253. 



The species of Hydrophoria may be distinguished according to the 

 following keys: 



Males 



1. Hypopleura with hairs on upper margin in front of spiracle; mid tibia with no an tero ventral 



bristle divisa Meig. 



Hypopleura without hairs on upper margin in front of spiracle; mid tibia with an antero- 

 ventral bristle or setula 2 



2. Abdomen with second and third terga partly yellowish testaceous; legs brownish. 



ruralis Meig. 

 Abdomen with second and third terga blackish ; legs blackish 3 



3. Eyes closely approximate, separated at narrowest part by a distance equal to diameter of 



anterior ocellus; fourth tergum not narrowed obliquely ventrad, of uniform breadth 



throughout 4 



Eyes separated by a distance at least equal to that between posterior ocelU; fourth tergum 

 narrowed obliquely ventrad, lateral margin much shorter than breadth along dorsum . . 5 



