333 



7. Halteres pale ; fore and mid tarsal claws short, subequal, hind pair 



very unequal, the inner about 4 times as long as the outer 



6. polita. 



— Claws on all tarsi subequal 8 



8. Halteres brown, tarsal claws small 9 



— Halteres pale, yellow or white 10 



9. Distance from cross vein to apex of third much greater than that 



from apex of third to apex of wing ; hypopygium very large 



7. wqualis. 



— Distance from cross vein to apex of third subequal to that from apex 



of third to ai)ex of wing ; hypopygium small 8. caudelli, S . 



10. Small species, 1 mm. ; claws minute, third vein united to first on 



its basal fourth Hartomyia arctica* (p. 343). 



— Larger species, at least 1.75 mm. ; claws rather large, third vein 



united to first by the normal cross vein 11 



11. Small species, 1.75 mm., third vein extending almost to apex of 



wing 9. macroneura. 



— Larger species, 4 mm. ; third vein extending to five sixths the wing- 



length 10. magna. 



12. Tarsal claws on all legs unequal; posterior branch of media obliter- 



ated except near apex 11. stigmalis. 



— Tarsal claws on all legs subequal ; posterior branch of media distinct 



except at its base 13 



13. Antenna not as long as head and thorax together ; halteres yellow, 



sometimes brownish ; hind tarsus with basal joint as long as next 

 3 joints combined 8. caudelli, 5 . 



— Antenna slightly longer than head and thorax combined; knob of 



halteres black; hind tarsus with basal joint as long as remaining 

 joints combined 12. lialteralis. 



I. JOHANXSENOMYIA DIMIDIATA Adams 



Ceratopogon dimidiatus Adams, Bull. Kans. Univ., Vol. 2, 1903, p. 27. 

 Jolxannseniella dimidiata (Adams) Malloeh, Bull. 111. State Lab. Nat. Hist., 

 A'ol. 10, p. 226. 



I have not seen this species, which was originally described by 

 Adams from Arizona. It is very closely related to hiniaculata Loew. 



2. JOHANNSENOMYIA BIMACULATA LoCW 



Ceratopogon himacidatiis Loew, Berl. Ent. Zeitschr., 1861, p. 311, sp. 6. 

 Johannseniella himaculata (Loew) Malloeh, Bull. 111. State Lab. Nat. Hist., 

 Vol. 10, p. 227. 



I redescribed this species in Article IV of \^olume X of this BuUe- 

 tin (p. 227 ). 



*This species is inserted here as well as in Eartomiiia because of a slight doubt 

 as to its generic position. 



