ACROCERID FLIES — SCHLINGER 



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Figure 3. — Heads of four species of PiaUa. P. ecuadorensis, new species: a, female, 

 lateral view; c, same, anterior view; d, male, anterior view; e, same, lateral view;/, same, 

 dorsal view. P. lomata Erichson: b, lateral view. P. antiqua, new species: g, lateral 

 view; h, anterior view. P. capitella, new species: :', dorsal view. 



