152 NORTH AMERICAN DIPTERA. 



2. Ungues slender and rather long tenuipes. 



Ungues stout and shorter. jordani. 



BIBIOCE1 HA LA. 

 i. Eyes contiguous; anterior branch of second vein running into \ ein 

 near margin of wing; eyes bisected; front femora of male 



strongly curved grandis. 



Eyes separated by a narrow or broad space, in lxith males and fe- 

 males; fore femora of male straight. ..... 2 



2. Eyes in lx>th sexes bisected. ....... 3 



Eyes of male bisected, of female not bisected; anterior branch of 



second vein running into the first very soon, making a triangle 

 in which the anterior branch forms the shorter side. doanei. 



3. Eyes of male separated widely; of female narrowly; anterior branch 



of second vein running into first vein very soon, forming a 



nearly equilateral triangle elegantula. 



Eyes of both male and female separated narrowly; anterior branch 

 of second vein running into first alxnit one-third the distance 

 from origin of second to tip of first vein. . comstocki. 



PHILORUS. 

 Philorus is represented by but two known species in America, viz: 

 yosetnite and anci/ia, and by one species in Europe, bi/obala Loew; of 

 the two American forms, P. ancilla has the eyes contiguous (in the 

 female at least) , while the eyes of P. yoscmitc are separated by a broad 

 front (in the male at least). 



PALTOSTOMA. 

 Paltostoma is known by a single described species from the West 

 Indies, and another from Brazil; one or the other or possibly a third 

 is known also from Central America. P. schineri will be recognized 

 from the generic characters and the figure. 



