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84 
Genus BELVOSIA Desv. 
Belrosia Desvoidy, Essai sur les Myodaires, p. 103; 1830. 
Latreillia Desvoidy, loc. cit., p. 104. (Non Roux; 1827.) 
Willistonia Brauer and Bergenstamm, Zweif. Kais. Mus. Wien, IV, p. 97; 1889. 
The identity of Belvosia and Latreillia has been acknowledged by 
several authorities; and Brauer and Bergenstamm state! that the lat- 
ter (the name of which is preoccupied in the Crustacea) is a subgenus 
of Willistonia. Our species have four postsutural and four sterno- 
pleural macrochetiv : 
1. Third abdominal segment yellowish pollinose except apically, wings 
brownish. 22 osee  ok ee ne Se eee ee eee 2. 
Third segment destitute of yellowish pollen, abdomen gray polli- 
nose except on the fourth segment, which is yellow pollinose, 
frontal vitta yellow, wings hyaline; length, 10 to12 mm. Mas- 
sachusetts; Ithaca and New York, N. Y.; Chicago, [ll.; Tifton, 
Ga.; and Mississippi. (Essai sur les Myodaires, p. 105; 183 
Latreiilia. Exorista flavicauda Riley, Second Rept. Ins. Mis- 
souri, p. 51; 1870: from the type specimen.) - -wnifusciata Desv. 
2. Sides of face at narrowest part each one-third as wide as the median 
depression, frontal vitta yellow, abdomen black, bases of last 
three segments yellowish gray pollinose; length, 11 mm. 
Charlotte Harbor, Florida. (Proc. Acad. Nat. Sciences Phila., 
Pp. 312 Septembery 15993). 2 at he See slossone Coq. 
Sides of face at narrowest point each more than one half as wide as 
median depression, frontal vitta dark brown, abdomen black, 
the last two segments except their apices yellowish poilinose, 
base of the second sometimes also narrowly yellowish pollinose ; 
relation of second and third antennal joint varies as follows: 
female, third joint 14, 13, 2, 24 times as long as the second; 
male, third joint 24,5, 55, and 4 times as long as the second; 
facial ridges bristly in female 4, 2, and 3, in male 3 to 3 distance 
above the vibrissie; length, 15 to 17 mm. Springfield, Mass.; 
District of Coitumbia; North Carolina; Tifton, Ga.; Mississippi; 
St. Louis, Mo.; [linois; Los Angeles Co., Cal.; Waco, Tex., and 
Mexico. (Systema Kntomologiie, p. «77; 1775: Musca. Belvosia 
bicincta Desvoidy, Essai sur les Myod., p. 105; 1830. Latreillia 
bifasciata F., Brauer and Bergenstamm in litt.) .. bifascrata Fabr. 
1Zweif. Kais. Mus. Wien, VI, p. 213; 1893. 
