138 BULLETIN BROOKLYN ENTOM. SOC, VOL. VIL February 1885. ] 
J.—F ace produced forward, pointed, concave from the antennze 
to lip, not tuberculate, sub-carinate, eyes of male contiguous 
or nearly so in front of ocellar tubercle; hind femora thicken- 
ed, abdomen without yellow markings.....Crioprora, O. Ss 
J1.—Face not evenly concave, tuberculate. 
J.—Third joint of antennz produced above into a pone 
process, terminating in the thickened arista; femora not 
thickened .\.(Saneee ney Geuse ste eee Merapioidus, Big. 
JJ.—Third joint of antenne transversely oval, but little broad- 
er than long; femora rarely thickened............. 
Criorrhina, (Meig.) Macq. 
_ MILESINAE. 
Large species, thinly pilose or nearly bare, with yellow spots or lat- 
eral stripes on the thorax above. Anterior cross-vein at or beyond the 
middle of discal cell and oblique; third longitudinal vein usually only 
gently curved; arista dorsal, bare; hind femora moderately Nickeay 
and elongate. 
A.—Hind femora with a conical protuberance below near the end. 
B.—Marginal cell of wing open; antennz more or less elongated 
Spilomyia, Meig. 
BB.—-Marginal cell closed and petiolated; antennze short.....Milesia, (Latr.) Fabr. 
AA.—Hind femora without such protuberance; marginal cell open. 
¢,—Dorsum of thorax with yellow lateral interrupted stripes; third joint of an- 
tennze elongate reel SRR ea SO Chrysotoxum, Meig. 
0C,—Dorsum of thorax not so striped; third joint of antennze not elongate. 
D.—Antennz inserted high up on a conical projection, front short, face 
much produced downward; antennz longer or shorter than the head.. 
Sphecomyia, Latr. 
DD.—Antennz short, situated low Ae near the middle of the head in pro- 
file, face not longer than the front........ Temnostoma, St. F. & Serv. 
CERINAE. 
A.—Rather large, elongate species, nearly bare; antennz longer than the head. 
second and third joints swollen, terminating in a short thickened style; third 
longitudinal vein strongly angulated, emitting a stump of a vein into the first 
posterior (Cell... a lee ee eb eee pe eee eb ere ne wenens Ceria, Fabr. 
_ AA.—Small species, nearly bare, not elongate; first two joints of the antennee very 
short, third elongate, dilated below near the base, and with a short thickened 
Veto gence: Ye pia vabee LANE Rae ch a'id SUR MRRR IRIE eyesore Steven Re SRL ED a .-Pelecocera, Meig. 
There is doubt about the determination of one of the above genera, 
_M. Bigot, claiming (Wien. Ent. Zeit. vol. iii. pp. 217, 320) that what I 
have named Zwuceratomyia is the same as his genus MMerapiordus. If 
