oept, 1913-] MeLANDER: SYNOPSIS OF DiPTERA. 231 



its former course (in Rhicnoessa and Tethina the auxiliary vein ends 

 in the first vein) ; genae broader than or as broad as the buccae ; post- 

 verticals convergent or wanting; antennal arista often loosely pubes- 

 cent or plumose, the basal joint always longer than wide, sometimes 

 even elongate and hairy ; often the hairs of the oral margin are in 

 more than a single row ; upper occiput often markedly concave ; pro- 

 thoracic bristle sometimes paired Geomyzin^. 



Subfamily OCHTHIPHILIN.E. 

 Table of Genera. 



But two posterior dorsocentrals ; postverticals wanting ; third antennal joint 

 short, reniform, the arista short and rather thick 2. 



Presutural and postsutural dorsocentrals present; postverticals convergent; 

 third antennal joint longer, its upper outer end rather angulate 3. 



2. Ocellar and fronto-orbital bristles wanting; palpi broad; mesonotum with 



numerous setuls ; one presutural; second antennal joint bristleless; 

 mesopleuras and pteropleurje bare ; alulae large and rather pointed. 



(Europe, Asia, North America.) Leucopis Meigen. 



A pair of ocellar and two fronto-orbital bristles present; second antennal 

 joint with a bristle on the upper side; mesopleurae and pteropleurae 

 with sparse setulae. (Europe.) Cremifania Czerny. 



3. Head flattened, triangular, pointed at the insertion of the antennae, face 



nearly horizontal; eyes horizontally oval; wings pictured. (Europe, 



North America.) Acrometopia Schiner. 



Head more rounded, front not projecting; eyes rounded, not transverse. .4. 



4. Dorsocentrals 1 -\- 2 ; no mesopleural bristles ; foremost fronto-orbital an- 



terior to the middle of the front ; head but little broader than the 



thorax. (Europe, Asia, North America.) Ochthiphila Fallen. 



Dorsocentrals i -t- 3 (or 4) ; mesopleurae sometimes with setulse ; foremost 

 fronto-orbital opposite middle of front ; head conspicuously broader 

 than the thorax. (Europe.) Parochthiphila Czerny. 



LEUCOPIS Meigen. 



Densely gray pruinose species of bluish-white luster, the abdoinen 

 more purely white-gray. This pruinosity seems to increase with the 

 maturity of the individual, so that it does not altogether have specific 

 value. I have one specimen, presumably simpler, where even the 

 antennae and palpi are completely coated. The maculation of the 

 abdomen and the distinctness of the thoracic stripes are quite variable. 

 Indeed, it is doubtful if the species listed in the table represent valid 

 species, for there is much gradation. Most of my specimens belong 



