srEXoriNTDvV,. 09 



TABLE OF GKNKRA. 



1. First posterior cell entire, nut intersected by a cross-vein. . . 2 

 "First posterior cell divided liy a cross-vein into two cells ; first nntennal 



joint unusually large." . . . :MET.\i'nRA<;.MA Co(iuiHett. 



2. Head much broader than long 3 



" Head not as broad as long, vertical dinineter of eyes equaling their 



horizontal diameter; first joint of antenna* unusually large and jwl- 

 ished". ....... Nehuitus Coquillett. 



3. Third joint of antenriffi short, the first thickened. . Tabuda Walker. 

 Third joint of antennse as long or but little shorter than tiie usually 



slender first joint. . . . . . ... • ■ 4 



4. Face bare or pubescent Psii.ocephala Zct'terstedt. 



Face pilose. .......-.•• 4 



3. FourTlf-posterior cell closed Theueva Latroille. 



"^wuxth posterior cell opi^i^, ... . . Dialineura ^ondani. 



2.3. SCENOPINIDiE. 



Flies of moderate or small size, black in color ami bare. 

 Front not excavated ; face bare, short and broad. AntennjB 

 approximated at the base, the first two joints short, the third 

 elongated, simple, without style or arista. Proboscis conceal- 

 ed ; palpi cylindrical, bristly at the tip. Ocelli present. Males 

 usually holoptic. Thor:ix rather long, moderately convex, 

 though apparently much so from the low position of the head. 

 Scutellum broad and short, without spines or tubercles. Ab- 

 domen flattened, more or less elongated, composed of seven 

 segments. Tegulee small. Empodia wanting. Third longi- 

 tudinal vein of the wing furcate ; basal cells long, the first 

 much longer than the second ; three posterior cells, the first 

 narrowed in, or closed before the margin ; anal cell closed. 



The larvae resemble closely those of the Therevidse. They 

 are very long and slender, having apparently nineteen seg- 

 ments, due to each of the abdominal segments except the last 

 being divided by a strong constriction. The larvae have been 



