MYCETOPIIILID7E. 17 



SCIARIXJE. 



1. Wings and halteres wholly wanting. . . EPIDAPUS 9 Haliday. 

 Wings and halteres as usual 2 



2. Tlie fourth vein springs from the third at the angle, i. e. the anterior 



cross- vein is obsolete. ...... KPIDAPUS $ 



Anterior cross-vein not obsolete. . . ... . . 3 



?>. Antennal joints of the male pedicillated and with whorls of hairs. 



ZYGONEURA Meigen. 



Antennal joints not pedicillated ; bare or with short hairs. . . 4 

 4. Wings very distinctly hairy. . . . TRICHOSIA Winnertz. 



Wings bare or but slightly hairy. . ... . SCIARA Meigen. 



MYCETOBIN^E. 



1. Auxiliary vein complete; the anterior branch of the third vein arises 



at the point where the third vein and the anterior cross-vein unite. 



MYCETOBIA Meigen. 



Auxiliary vein rudimentary, not terminating in the costa ; the fork of 

 the third vein petiolate. . . . . . . . . 2 



2. Fork of the third vein shorter than the fork of the fourth vein. 



PLKSIASTINA Winnertz. 

 Fork of the third vein longer than that of the fourth. 



DITOMYIA Winnertz. 



CEROPLATIXJE. 



1. Face and proboscis prolonged, snout-like. . ASINDULUM Latreille. 

 Face and proboscis not produced. . . . . _ . . . 2 



2. Antennas shorter than the head and thorax, flattened ; palpi short. 



CEHOPLATUS Bosc. 

 Antennae usually more elongate, cylindrical ; palpi moderately long. 



PLATYURA Meigen. 



SCIOPHILIN^E. 



1. Anterior cross-vein more than twice the length of the first section of the 



third vein, forming apparently the beginning of the third vein. 



TETRAGONEURA Winnertz. 



Anterior cross-vein but little longer or shorter than the first section of 

 the third vein, and forming a distinct angle with the second section. 2 



2. The costal vein terminates at the tip of the third vein. SCIOPHILA Meigen 

 The costal vein continues a short distance beyond the end of the third 



vein. . . . 3 



3. Fork of the fourth vein very short petiolate, the prefurca shorter than 



the anterior cross-vein. .-, . . . . . . 4 



Prefurca of the fourth vein much longer than the anterior cross- vein. 5 



3 



