176 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO. 



2.75 times the length of the fore metatarsus. Halteres yellow. 



Female. Like the male but the wing is proportionately 



larger. S. D. (Aldrich, col.) ; Wyoming and Wisconsin 



(Wheeler, Col.). September. Recorded also from Nebraska. 



9. Mycomya nigricauda Adams. 

 1903. nigricauda, Adams, Kas. Science Quart. II. 23. {Scio- 



phila). 

 Male. Length 4 mm. 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 pollinose, pile black, halteres yellow ; abdomen 

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

 yellow, pile light brown ; legs yellow, tarsi, except base, fus- 

 cous ; wings hyaline, larger veins brown, subcostal crossvein near 

 apex of subcostal vein and just before the middle of the cell R^, 

 first branch of media about as long as its prefurca, furcation of 

 the cubitus takes place just beyond the small crossvein. Colo- 

 rado City, Colo., July. 



10. Mycomya hrevitittata Coquillett. 

 1905. hrevivittata, Coquillett, Journ. N. Y. Ent. Soc. XIII. 6"/. 



(Sciophila) . 

 Male. Length 3.5 to 4 mm. Head reddish brown, vertex 

 dusky ; ocellar spot black, distinctly marked ; face, palpi, pro- 

 boscis, scape and basal joints of flagellum yellow, remainder of 

 flagellum brown ; antennae rather short, compressed, first fla- 

 gellal joint about twice, the others but little longer than wide. 

 Thorax yellow, subopaque, lateral stripes brown or black, abbre- 

 viated anteriorly and not meeting posteriorly ; a brown spot 

 over the base of the wing, a geminate reddish brown median 

 stripe not reaching the scutellum, dorsum and sides of metano- 

 tum and some spots on pleura, brown; the four scutellar setae, 

 and the marginal setse of mesonotum black and conspicuous ; 

 the fine pale hairs more numerous than in related species. Ab- 

 domen yellow, the posterior third or half of each tergite black- 

 ish, subshining, sixth and seventh segments wholly black. Hy- 

 popygium (fig. 134) yellow, resembling that of M. levis Dzied., 

 the two pairs of forceps and the intermediate appendages are 

 all slender and not produced beyond the margin of the ventral 

 sclerite ; this sclerite is provided with a pair of lateral processes 



