274 AMERICAN DIPTERA. 



^cleropogoii similis n. sp. 



Near S. hehobts.— 9 • Length of body 24 mm. ; of wings 12 mm. When com- 

 pared with 5?. helvolus the antennae are shorter, third joint broader and less than 

 the length of the first two joints together. Style as long as the third joint, first 

 two joints yellowish-red, apex of second darker, third joint and style black. The 

 specimen is somewliat rubbed, but where the pollen can be seen it is similar to 

 that of the preceding species. Wings hyaline, first posterior, fourth posterior and 

 anal ceil closed, the two former petiolate. Hypopleura with a patch of bristles. 



Type. — One female from V3,]entiue, Nebraska. 



4. STEIVOPOGOIV Loew. 



Steiiopo^oii seHCidinns Wiliistnn. 



Two females from Lincoln, Nebraska, July (H. S. Smith;. The 

 specimens agree with the description of the male, except that they 

 are respectively 17 and 20 mm. in length. Formerly recorded from 

 three males from Kansas. 



Stenopogon consanguineus Loew. 



Numerous specimens from Glen, Sioux Co., Nebraska (P. R. 

 Jones). This species is common in northwestern Nebraska in the fall. 



Stenopogon inqiiinatiis Loew. 



Specimens from Glen, Sioux Co., Springview Bridge, Brown Co., 

 West Point and Lincoln, Nebraska. The specimens vary from 

 light colored specimens with a yellow abdomen to dark colored 

 specimens with a brownish-black abdomen. The first posterior cell 

 is nearly closed in some specimens, while in others it is wide open. 

 The antennae are not typical for the genus Stenopogon, the third 

 joint being about the length of the first two together, and the arista 

 more than one-half the length of the third joint. The hypopleura 

 do not have a patch of bristles, which Mr. Coquillett thinks is a 

 better character for separating Steyiopogon from Scleropogon than 

 the length of the style. 



5. L.APHYSTIA Loew. 

 Liaphysiitia sp. 



Ten females from Lincoln, Nebraska, June and July, and War 

 Bonnet Canon, Sioux Co., Nebraska, which present such a bewild- 

 ering number of variations that I am unable to refer them to any of 

 the species from North America. They vary in wing venation from 

 having the first posterior cell slightly narrowed, through one closed 

 in one wing and nearly closed in the other to both closed. They 



