/ 
132 BULLETIN. BROOKLYN ENTOM. SOC. VOL. VII. February 1885. ] 
MICRODONINAE. 
Anterior cross-vein near the base of the discal cell, or near the 
middle, and more or less oblique. Marginal cell of the wing open. 
Legs slender. Femora not thickened. First and third joints of the an- 
tennze elongate, the second more or less so. Large species. 
A.—Scutellum thickened, usually with two points; face rounded, not tuberculate, 
pilose; without distinct yellow markings.............. .. Microdon, Meig. 
AA.—Face produced downwards, obitusely convex on lower part, yellow with black 
median stripe; third longitudinal vein with a distinct curvature: thorax with 
lateral yellow interrupted stripes; abdomen banded. (Chrysotoxum). 
PIPIZINAE. 
Anterior cross-vein near the base of the discal cell, rectangular, the 
third vein usually straight, antennz a little elongated or short; marginal 
cell open; face rounded or tuberculate, receding above the oral margin; 
mostly small, nearly bare, finely punctulate species, with short, oval ab- 
domen; hind femora rarely somewhat thickened. 
A.—First and second joints of antennee very short, the third large, subquadrate, 
with a sub-terminal arista; abdomen very convex, the venter deeply excavated..... 
Nausigaster, Will. - 
AA.—First two joints ofantennze not unusually shortened, the arista basal, eyes pilose. 
B.—Face evenly rounded, not at all projecting in profile, dark, without yellow, 
obtusely rounded behind; finely punctulate, black or black and red, not | 
amd edits a ei hic, foal) AAMAS fee ed Ds ih ee eae Paragus, Latr. 
CHILOSINAE, 
Small to moderately large species, never with light markings other 
than luteous spots sometimes present at the base of the abdomen, scu- 
tellum, lower part of the face, etc.; usuallv the color is uniformly black, 
with or without metallic greenish markings or wholly deep shining black, 
the abdomen never with entire cross-bands of any kind. Antennz elong- 
ate or short, the face with a distinct tubercle, or if not, the oral border 
in front is projecting; abdomen oval, never elongate or club-shaped; 
marginal cell of wings broadly open, third longitudinal vein nearly 
straight, anterior cross-vein near the base of discal cell. 
A.-——Hind femora distinctly thickened. 
B.—Antennz elongate; body clothed with sparse tomentum; all the femora 
thickened and with a row of short spines below....,....Lepidomyia, Loew. 
BB.—Antennz short, all the femora not thickened. 
