200 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



B. No cross-vein between media and cubitus (=no cross-vein 

 connecting veins four and five). 



Blepharocera (PI. XIX, figs, i, 2 and 3). 

 B. B. A cross-vein between media and cubitus (=;a cross-vein con- 

 necting veins four and five). 



Philorus ( PI. XIX, figs. 8 and 9). 



Table of Species of Bibiocephala. 



Eyes contiguous; rj running into r^ near the margin of tire wing (=anterior 

 branch of second vein running into vein near margin of the wing); eyes 

 bisected ; fore femora of male strongly curved. 



I. B. grandis O.S. (Colorado, Utah, Idaho). 



Eyes separated by a narrow or broad space, in both males and females; eyes 

 bisected ; fore femora of male straight . 

 Eyes of both male and female bisected. 



Eyes of male separated widely; of female narrowly; r.^ running into 

 r^ (anterior branch of second vein running into first vein) very 

 soon, forming a nearly equilateral triangle. 



2. B. eleganUdus von Roder (Nevada, Idaho, Colorado). 

 Eyes of both male and female separated narrowly; r.^ running into 

 r, at about one-third of the length of the distance from origin of 

 radial sector to the tip of r, (anterior branch of second vein 

 running into first vein at about one-third the distance from origin 

 of second vein to tip of first vein). 



3. B. coDistocki, sp. nov. (California). 



Eyes of male bisected; of female not bisected; r^ running into r, very 

 soon, making a triangle in which r., forms the shortest side (anterior 

 branch of second vein running into first vein very soon making a 

 triangle in which anterior branch of second vein forms the shortest 

 side). 4- B. doanei Kellogg (California). 



Table of North American Species of Blepharocera. 



Eyes of female contiguous, of male separated by broad space; length not 



over 6 mm. 



I. B. osteti-sackeni, sp. nov. (Northern California). 



Eyes of both sexes separated by narrow space; length not less than 7 mm. 

 Ungues slender and rather long. 



2. B. capitata Loew (Northeastern United States). 



Ungues stout and shorter. 



3. B. jordani, sp. nov. (California). 



