Autoren alphabetisch geordnet. 713 
Bestimmungstabelle der Genera. 
1. Costal vein terminating at the tip of the third vein 2. 
Costal vein continued to the fourth vein 6. 
2. Hind cross vein present 3. 
Hind cross vein wanting Elliponeura. 
3. Posterior femora not thickened 4. 
Posterior femora unusually thick Meromyza. 
4. Front projecting in front of the eyes at least two-thirds the 
length of their horizontal diameter 5. 
Front not projecting more than one-half of the diameter of 
the eyes Chlorops. 
5. Third joint of antennae at leat twice as long as wide Ketecephala. 
Third joint only slightly longer than wide Eurina. 
6. Hind tibiae each bearing a stout curved spur at tip ofinner side 7. 
Hind tibiae destitude of such spurs 8. 
7. Antennal arista unusually broad Ceratobarys. 
Antennal arista slender Hippelates. 
8. Tip of second vein less than the length of the hind cross vein 
beyond the first Sigaloessa. 
Tip of second vein several times the length of the hind cross 
vein beyond the first T 
9. Arista of antennae not broadened 10. 
Arista unusually broadened Elachiptera. 
10. Last section of fourth vein three or more times as long as 
the penultimate section Ir 
Last section less than twice as long as the penultimate sec- 
tion Mosillus. 
ll. Antennal arista bare or pubescent 12. 
Antennal arista short plumose Gauras, 
12. Epistoma noticeably produced forward Siphonella. 
Epistoma not produced forward Oscinis. 
Chlorops eurinaexilis.n. sp., Beverly Mass., Colorado, Chlo- 
rops aristalis n. sp., Nord und Süd Georgia, Chlorops scabra 
n. sp., Oswego, N. Y., Chlorops rubida n. sp., Colorado, Placer Co., 
Cal., Chlorops graminea n. sp., Lancaster, Cal, Chlorops pul- 
lipes n. sp., Santa F6, N. Mex., Cafion City, Colorado, Chlorops assi- 
milis Macq., Siphonella obesa Fitsch, Chlorops trivialis H, Lw. und 
Ch. bistriata Wlk. sind Synonyme dazu. Chlorops prolifica O.S. ist 
Synonym von Üh. variceps H.Lw., Gaurax anchora H. Lw. Diese 
Art ist von Williston unter dem Namen Elachiptera dispar be- 
schrieben worden. Gaurax montanus n. sp., Mt. Washington, 
White Mountains, N. H., Hippelates capaxn. sp. 2, Nord Illinois, 
Hippelates bicolor n. sp., Lake Worth, Fla., Siphonella in- 
quilinan. sp., Virginia, St. Louis, Oscinis virgata n. sp. 2d', Os- 
cinis pectoralis.n. sp. ?, Franconia, N. H., Sigaloessa flaveola 
n. sp., Franconia, N. H., Biscayne Bay, Fla., Washington. 
— (7). Additions to my Synopsis of the Tachinidae. Canad. Ent. 
XXX p. 233—237. 
