84 
Genus BELVOSIA Desv. 
■» 
Belrosia Desvoidy, Essui sur les Myodaires, ]». L03; L830. 
Latreillia Desvoidy, loc. cit., p. L04. (Non Rous; L827.) 
fYillUtonia Brauer and Bergenstamm, Zweif. K;iis. Mas. Wien, IV, p. ( J7; 1889. 
The identity of Belvosia and Latreillia has been acknowledged by 
several authorities; and Brauer and Bergenstamm state 1 that the lat- 
ter (the name of which is preoccupied in the Crustacea) is a subgenus 
of Willistonia. Our species have tour postsutural and four sterno- 
pleural niaerochaetse: 
1. Third abdominal segment yellowish pollinose except apically, wings 
brownish 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 to 12 mm. Mas- 
sachusetts; Ithaca and New York, N. Y.; Chicago, 111.; Tifton, 
(la.; and Mississippi. (Bssai sur les Myodaires, p. 105; L830: 
Latreillia. Exori&ta flavicauda Riley, Second Kept. Ins. Mis- 
souri, p. 51; L870: t'roin the type specimen.).. unifasciata 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. (Troc. Acad. Nat. Sciences Phila., 
p. 312; September, L895.) si 088 once Ooq. 
Sides of face at narrowest point each more than one half as wide as 
median depression, frontal vitta dark brown, abdomen black, 
the last i wo segments except their apices yellowish pollinose, 
baseof the second sometimes also narrowly yellowish pollinose; 
relation of second and third antennal joint varies as follows: 
female, third joint U. LJ, i?, '2\ times as long as the second; 
male, third joint 2J, 3, '■>.[. and A times as loug as the second; 
facial ridges bristly in female .\. '/;. and H, in male § to {distance 
above the vibrissa' ; length, 13 to 17 mm. Springfield, Mass.; 
District of Columbia; North Carolina; Tifton, (Ja. ; Mississippi; 
St. Louis, Mo. ; Illinois; Los Angeles Co., Cal. ; Waco, Tex., and 
Mexico. ( Sy sterna Entomologire, p. '77; 1775: Musca. Belvosia 
bicincta Desvoidy. Bssai sur les Myod., p. 103; 1830. Latreillia 
bifaseiata F., Brauer and Bergenstamm inlitt). .bifasciata Fabr. 
■Zweif. Kais. Mus. Wien, VI, p. 213; 181)3. 
