I08 KANSAS UNIVERSITY (JUAKIERI.V. 



characters of the genus. It gives me pleasure to name the genus 

 in honor of Prof. C. H. T. Townsend, who has Avritten so abl\' on 

 North American diptera. 



To"wnsendia minuta, n. sp. 



Male. Black. Front and face thickly white pollinose: mystax 

 white. Antennae black. Mesonotum opacjue ^'ellowish white, 

 with a broad median stripe and a spot on each side brown. 

 Pleura' thinh' whitish pollinose. Abdomen shining black, the first 

 segment whitish pollinose, the pile along the sides of the anterior 

 segments white. Legs yellowish red, the front and middle femora 

 above, the hind femora except the base and tip, a broad ring on all 

 the tibi;e, and the tarsi for the most part, black. Wings grayish 

 h\aline. Length 3 ' _. millim. 



Two specimens, Mexico, H. H. Smith. This species is the 

 smallest that I know of in the family of Asilida-. 



I may mention here that the genus Ortlioiicuroiiiyia Will, is 

 in all probability synonymous with Psiloctinis Loew, though the 

 type species are very diiierent. 



Arlhrostylum, gen. nov. {I.ct^lidic). 



Male. Head broader than the thorax, hemispherical. Front 

 and face narrow, of equal width. Face smooth throughout, with- 

 out grooves, following the contour of the eyes and not at all visible 

 in profile. Antenna^ situated above the middle of the head in pro- 

 file, with a long, terminal, jointed style; first joint a little shorter 

 than t!ie two following combined, second joint about as long as 

 wide; third joint cordate; style longer than the joints preceding 

 it, composed of five distinct segments of which the first is as wide as 

 long ami the others successively increasing in length, the last 

 pointed at the tip and nearly as long as the four preceding it to- 

 gether. Thorax elongate: metanotum prominent. Abdomen long 

 and slender, narrowed at the posterior part of the first (second?) 

 segment, the following joints cylindrical, the h}'popygium a little 

 thicker. Legs long: the hind pair much elongated, their femora a 

 little thickened distally: front tibia- with a single spur, the others 

 with two each. Wings elongate; aluhe rudimentary; fourth pos- 

 terior cell and the anal cell closed near the margin. 



The present genus is nearly allied to W'nnileo, but is clearly dis- 

 tinct in the dichoptic male, the slender, articulated style, and the 

 closed cells of the wings. The genus is of especial interest as add- 

 ing another link between the Leptidai and the Xylophagida^. 

 The stvle is distinctly differentiated, it is true, yet the difference 



