ACROCERID FLIES SCHLINGER 363 



3. Wing with first and second basal cells of nearly equal length; eyes covering 



more than one-half of head capsule (Brazil) ... P. capitclla, new species 



Wing with second basal cell about one-third longer than first; eyes covering 



only one-third of head capsule (Ecuador) . . P. ecuadorensis, new species 



4. Wing with anal cell widened at apex, six posterior cells; antennae inserted 



on large tubercle 5 



Wing with anal cell nearly of equal width throughout, four posterior cells; 

 antennae inserted on slightly raised tubercle 6 



5. Mesonotum yellow with two longitudinal stripes; fifth posterior cell about 



one-fifth as wide as long at its widest point (Brazil). 



P. lutescens Westwood 

 Mesonotum entirel}'' dark brown, without stripes; fifth posterior cell about 

 one-half as wide as long at its widest point (Brazil). 



P. antiqua, new species 



6. Wing with vein R24 3 incomplete, not reaching wing margin; thorax and 



abdomen orange with black maculations (Ecuador). 



P. ecuadorensis, new species 



Wing with vein R2+3 complete, reaching wing margin; thorax all black, 



abdomen dark brown, yellow only on parts of tergites IV-VI (Brazil). 



P. lomata Erichson 



Pialea antiqua, new species 



Figures 2,6; 3,gh; 4,c,« 



Female: Length of entire specimen 9.70 mm. ; wing length 8.75 mm. 



Color: Brown and black; head except antennal tubercle, oceUi, 

 proboscis and distal one-fifth of antennal segment III black ; remainder 

 of specimen dark brown except tip of antennal segment III, narrow 

 apical margins of tergites I-IV, large apical margin on V and all of 

 VI, which are light brown; halter yellow, wing membrane light brown 

 infuscated, wing veins and squama brownish yellow, pulvilli white. 



Pile: Yellowish brown, about same density over entire specimen, 

 little thinner on antennae, that on antennal segments, antennal 

 tubercle, tibiae, and tarsi about as long as antennal segment II, that 

 on all other parts about as long as antennal tubercle; dorsal and 

 ventral surfaces of squama with minute pile, squamal margin with 

 normal length pile, but golden. 



Head: Yv^ith well developed antennal tubercle (fig, 3,g); eyes in 

 lateral view covering over one-half of head capsule; segment I of each 

 antenna fused only on basal one-third (fig. S,h), about twice as long 

 as segment II; segment III long, tapering to point terminating in 

 apical seta, pile on upper outer surface only; ocellar tubercle not 

 well raised; proboscis visible, short, slightly exceeding proboscis 

 tubercle in length (fig. S,g). 



Thorax: Not as strongly arched as in lomata; scutellum wider than 

 long; squama narrow, paper thin, evenly arched in middle, rounded 

 behind; femur of each leg longer than corresponding tibia, tarsi with 

 metatarsi not compressed (fig. 4,e), tibial spur on each leg about as 



