192 NEW NORTH AMERICAN ANTHOMYIIDAE (dIPTERa) 



fifth ventral sesinent with slender processes which are armed with lon^: 

 bristles on their entire length. All tarsi compressed, the fore pair noticr>- 

 ably so; fore tibia with one posterior bristle; mid tibia with one anterior, 

 two postero-dorsal and two postero-ventral bristles; hind femur bare on 

 postero-ventral surface, bristled from base to apex on antero-ventral surface ; 

 hind tibia with three antero-ventral, six or seven unequal antero-dorsal, 

 three strong and two or three weak postero-dorsal, and usually two or three 

 weak posterior bristles. Costal thorn about as long as inner cross-vein; 

 last se(!tion of fourth vein 1.75 as long as preceding section. 



Female.— Differs from the male in having the frons one-third the width 

 of head, interfrontalia with strong cruciate bristles, thorax and abdomen 

 less bristly and more distinctly luminescent, the thorax rather distinctly 

 trivittate, the mid tibia with a bristle on the antero-ventral svn-face below 

 the anterior one, the costa distinctly setulose and the costal thorn longer. 



Length, 5 mm. 



Tijpe.— d"; Washington State, April 4 to 20, 1893, (Kincaid), 

 [Illinois]. 



Resembles muscaria Fabricius, Init differs in antennal structure 

 and in chaetotaxy. 



Hylemyia setifer sp. n. 



Male. — Black, shining, densely grayish pruinescent. Head entirely black, 

 or with the anterior margin of frons and part of the parafacials reddish; 

 orbits, face and cheeks with white pruinescence. Thorax with three faint 

 brown vittae. Abdomen with a subtriangular black spot on dorsimi of 

 each segment. Legs black. 



Eyes separated by about width between posterior ocelh; arista with its 

 longest hairs about twice as long as its basal diameter; parafacial as wide 

 at base of antennae as width of third antennal joint. Presutural acrostichals 

 two-rowed, irregular; prealar bristle small. Abdomen narrow, depressed; 

 hypopygium of moderate size, inferior forceps slender, rather long; filth 

 sternite with numerous long unequal bristles. Fore tibia with one or two 

 posterior median bristles, the apex without any bristle on posterior side; 

 fore tarsus longer than tibia; mid tibia with or without a small antero-ventral 

 setula, with an antcu'o-dorsal bristle, and two postero-dorsal and posterior 

 bristles; hind fenun- with a scries of closely placed bristles on antero-ventral 

 surfa(;e, the longest bristles at middle, and a series of shorter bristles on 

 basal half of postero-ventral surface; hind tibia with about six antero-ventral, 

 four antero-dorsal an(l three postero-dorsal bristles, the posterior surface- 

 with iui almost complete series of setulose hairs. Costal thorn long, costal 

 setulae a little longer tlian diameter of costal vein. Length, o to t) nun. 



Type.— d"; Grant, Colorado 1(),()()() feet, July 20, 19l(), (K. (1. 

 Jackson). Paratypea. — One male from each of the following: 

 liozeman Montana, June 20, lOlo; July 23, 1911, July 9, 1917; 



