HELEOMYZID FLIES NORTH OF MEXICO—GILL 519 
Blephariptera Macquart, 1835, p. 412 (part). 
Aecothea Haliday, 1838, p. 187.—Walker, 1849, p. 1094.—Coquillett, 1910b, 
p. 5038. 
Oecothea Haliday, Loew, 1859, p. 54; 1862b, p. 128.—Pandellé, 1901, p. 353.— 
Aldrich and Darlington, 1908, p. 73.—Czerny, 1924, p. 88; 1927a, p. 31; 
1928, p. 54.—Curran in Curran and Alexander, 1926, p. 290.—Collin, 
1943, p. 244.—Collart, 1948, p. 2. 
Leria Robineau-Desvoidy, Schiner, 1864, p. 28.—Rondani, 1867, p. 124. 
As stated by Aldrich (1926), Aecothea was the original spelling of 
the genus name. Walker (1849) and Coquillett (1910b) also used 
this spelling. 
The genus is easily distinguished from all others except Lutomyia 
by the presence of antero- and posterodorsal bristles (in addition to 
the dorsal preapical bristles) on the middle tibiae. The position of 
the anterior crossvein at or before the basal fourth of the discal cell 
in Lutomyia will separate it from Aecothea and all other genera in 
the family. 
Key to the Species of Aecothea 
1, Scutellum bare except for usual lateral bristles . ..... artstata Malloch 
SCUuLelUMwinMSelde.On GOTSUMA s fa «os pe lece scse4~ (se 6) wy taro. oy ee 2 
2. Anterior crossvein with conspicuous dark clouding. ... . fidelis Curran 
Anterior crossvein without conspicuous dark clouding. ......... 3 
3. Epiphallus of male expanded into heart-shaped disc at distal end. 
specus (Aldrich) 
Epiphallus of male not expanded into heart-shaped dise at distal end. 
fenestralis (Fallén) 
Aecothea aristata Malloch 
Figures 19, 20 
Oecothea aristata Malloch, 1919, p. 82.—Czerny, 1924, p. 89. 
The absence of setae on the scutellum will very easily distinguish 
this species from others in the genus. 
DistrisutTion.—Type locality: Bernard Harbour, Dolphin, and 
Union Strait, Northwest Territories, 10 July 1916, F. Johansen; 
paratypes from same locality as type, 1-7, 14 Aug. 1915 and Sept. 
1915, F. Johansen. In addition to the type locality, specimens have 
been collected from lat. 68°20’, long. 151°30’, Alaska, 26 Aug. 1948, 
N. A. Weber and lat. 69°10’, long. 141°, 14-17 Aug. 1912, Jessup. 
These specimens are in the U.S. National Museum. 
Aecothea fenestralis (Fallén) 
Figures 21, 22 
Helomyza fenestralis Fallén, 1820, p. 5.—Meigen, 1830, p. 56.—Zetterstedt, 1847, 
p. 2460. 
Helomyza fuscipennis Meigen, 1830, p. 59. 
Blephariptera fenestralis (Fallén), Macquart, 1835, p. 414. 
