318 Annals Entomological Society of America [Vol. XIII, 



fifth tergite broadly emarginate and apically fringed with three bristles 

 on each side. Front coxae testaceous, but silvery pollinose, remainder 

 of front legs piceous, the tarsi black, posterior legs including tarsi 

 testaceous, front femora with five extensor bristles, front tibiae with one 

 preapical, two or three anterior bristles on middle femora, four extensor 

 and a few short irregular bristles on hind femora, the two preapical 

 bristles of hind tibiae large. Halteres and calypteres brownish yellow. 

 Wings uniformly infumated, a little stronger along the costa and besides 

 the posterior crossvein; veins dark brown, first vein ending a little before 

 the anterior crossvein, posterior crossvein straight, costal sections 

 proportioned 1 : 1 : 3 : 1.2 : 0.7. 



One specimen. Three Forks, Montana,* August 1, 1918. 



Antichaeta testacea new species. 



Male — Length 5.2 mm. Occiput yellow, cervical spot l^rown, front 

 luteous, periorbits subshining, extending half way to suture, middle 

 stripe with parallel sides, complete, face, cheeks and lower occiput pale, 

 profile very slightly concave and receding, cheeks one-third the eye- 

 height, eyes horizontally oval, two f ronto-orbitals ; antennae reddish, 

 first joint minute, second bowl-shaped, shorter than deep and one-third 

 as long as the oval third joint, arista black except its basal joint, its 

 hairs moderately long and loose. Thorax entirely testaceous, not 

 heavily dusted; genitalia large, yellow. Legs yellow, last tarsal joint 

 darkened, front femora with about six bristles above and hind femora 

 with about three above and eight below ; middle femora with two small 

 bristles in front near center. Halteres yellow. Wings hyaline, veins 

 thin, yellowish, apically and crossveins darkened, posterior crossvein 

 straight and perpendicular to fifth vein. 



Holotype. Collected by A. D. Hastings, June 11, 1904, in 

 Gallatin County, Montana.* 



Antichaeta melanosoma new species. 



Female — Length, 4.5 mm. Body black, legs mostly yellow. Front 

 wider than long, quadrate, middle stripe shining, parallel-sided, attaining 

 suture, as broad as each of the opaque side stripes, periorbits shining, 

 only one fronto-orbital ; lower orbits pruinose and yellowish, center of 

 face triangularly black, cheeks about one-fifth eye-height, lower occiput 

 brown, upper shining black, with bigeminal silvery spot; mouthparts 

 black; antennas yellow, second joint shorter than deep, third joint 

 oblong-oval, one-third longer than deep and half as long as arista, the 

 base of the bushy black arista stout. Notum subshining, lower pleurae 

 pruinose, chaetotaxy as in A. robiginosa, upper surface of abdomen 

 shining. Legs, including coxae, yellow; front coxae with silvery sheen, 

 the front legs black beyond three-fifths of the femur, two preapical 

 bristles on hind tibia. Halteres, calypteres and root of wing yellow, 

 wings hyaline, veins brown, not infumated, costal sections proportioned 

 0.8 : 1 : 1.2 : O.S : 0.5, anterior crossvein at middle of discal cell. 



One specimen. Polk County, Wisconsin, July, collected by 

 Professor C. F. Baker and transmitted by Dr. Aldrich. 



