ADAMS : DIPTEROLOGIOAL CONTRIBUTIONS. 23 



tips of tarsi fuscous ; wings grayish hyaline, marginal cell twice 

 as long as broad, anterior branch of third vein angulate, its 

 apex turned towards base of wing, auxiliary cross-vein slightly 

 beyond middle of marginal cell. Length, 6 mm. 



Manitou Park, Colo., August. Prof. F. H. Snow. 



It is near S. flavohirta Coq., but differs in the markings of the 

 thorax, length of anterior tibiae, and the angulated anterior 

 branch of the third longitudinal vein. 



Sciophila nigricauda, n. sp. 



Male : Yellow, subshining ; head black, base of antennae and 

 mouth-parts yellow, sparse pile black ; thorax yellow, in places 

 slightly tinged with brown, viewed from before slightly grayish 

 poUinose, pile black, halteres yellow; abdomen yellow, apices 

 of segments, last one wholly black, hypopygium yellow, pile 

 light brown ; legs yellow, tarsi, except base, fuscous ; wings 

 hyaline, larger veins brov/n, auxiliary cross-vein near apex of 

 auxiliary vein and just before the middle of the marginal cell, 

 first branch of fourth vein about as long as its prefurca, furca- 

 cation of the fifth vein takes place just beyond the small cross- 

 vein. Length, 4 mm. 



One specimen; Colorado City, Colo., July, 1894. E. S. 

 Tucker. 



Tetragoneura nitida, n. sp. 



Female: Black, shining; head black, front bearing yellow 

 pile, antennie dark brown, first two joints and palpi yellowish ; 

 mesonotum black, shining, pile yellow, bristles on margins 

 black, scutellum black, bristles yellow, metanotum and pleurae 

 black, halteres yellow ; abdomen wholly shining black, pile yel- 

 low ; legs yellow, with tip of hind femora, middle and hind 

 tibiae and all tarsi brown ; wings hyaline, tinged with brown 

 on the anterior part, auxiliary vein short, ending free, the fur- 

 cation of the fourth vein is slightly distad to that of the third, 

 the furcation of the fifth is nearly opposite the junction of the 

 small cross- and fourth veins. Length, 2,7 mm. 



One specimen ; Atherton, Mo. Collected by writer, May 5, 

 1901. 



