BLEPHAROCERID.E- I5I 



from Canada, New York, Colorado, New Mexico, Idaho, 

 Utah and California. The foreign species are found in 

 Europe, Asia, South America and certain Mediterranean 

 islands. 



The family is readily divisible into two groups, of 

 which one, characterized by the absence in its members 

 of a short, incomplete vein near the posterior margin of 

 the wing, includes six genera, nearly all of which are 

 represented by a single species^ and none of them occur- 

 ring in North America, north of Mexico. The remaining 

 known species are grouped according to the latest revis- 

 ion of the family (Kellogg, 1903) into three genera rep- 

 resented in Europe by about six species and in America 



by eight. 



TABLE OF GENERA. 



1. No incomplete vein running into hind border of the wing [Apisto- 



myia, Corsica; Hammatorhina, Ceylon; Kelloggina, Brazil; 

 Curupira, Brazil; Hapalothrix, Europe). Proboscis: elongated; 

 hind tibiae with spurs; eyes entire, not bisected (2) . 



Paltostoma. 

 An incomplete vein near the posterior margin of the wing. . 2 



2. Second longitudinal vein with an anterior branch; a cross-vein con- 



necting the fourth and fifth veins, that is, the second basal cell 

 complete. Anterior branch of second vein and the second and 

 third veins all separating at a common point or close together 



(4) Bibiocephala. 



Second longitudinal vein simple, without branch. ... 3 



3. No cross-vein connecting the fourth and fifth veins, that is, the 



second basal cell incomplete (1). . . Blepharocera. 



A cross-vein connecting the fourth and fifth veins, the second basal 



cell complete (3) Philorus. 



TABLES OF SPECIES. 



BLEPHAROCERA. 



1 . Eyes of female contiguous, of male separated by broad space; length 



not over six millimeters. .... ostensackeni. 



Eyes of both sexes separated by a narrow space; length not less 



than seven mfllimeters. ...,.". 2 



