24 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



Described from one female collected at Perales, Chile, by Rev. 

 Anastase Pirion. 



7V;>e-— Female, Cat. No. 41384, U.S.N.M. 



PIRIONA, new genus 



Hypopleural bristles and postscutellum well developed; ocellars 

 large in both sexes, curving directly to the side, neither proclinate 

 nor reclinate; eyes and para facials densely pilose; frontals ending 

 hardly below base of second antennal joint; outer verticals not devel- 

 oped, inner strong, just behind them on occiput a smaller pair of con- 

 vergent bristles, almost decussate; back of head bulging, front not 

 prominent, antennal axis slightly exceeding vibrissal ; cheek one-third 

 of eye height, parafacial one-half of cheek; facial ridges bare, not 

 prominent, vibrissae at oral margin, which is slightly above lower edge 

 of head, not protruding; palpi normal, proboscis short, fleshy; anten- 

 nae inserted just below level of middle of eye, reaching nearly to 

 vibrissae, third joint rather wide, hardly twice as broad as long and 

 much less than twice the second ; arista bare, penultimate joint short ; 

 female with usual two pairs of proclinate orbitals. Scutellum with 

 two laterals, a long decussate apical pair, and several irregular erect 

 straight bristles. Xo acrostichals immediately before suture. A few 

 minute infrasquamal setules present. Abdomen without median mar- 

 ginals on first segment, a pair of large discals and a i:)air of large 

 marginals on second, third with a pair of large discals and a marginal 

 row (marginals of second and third rather far forward). Female 

 without piercer. Legs with large bristles, middle tibia with one 

 large on flexor side, hind with several large bristles widely spaced on 

 outer hind side. AVing of ordinary form, no costal spine, first vein 

 bare, third with a few large hairs at base; fourth vein with angular, 

 slightly oblique bend, ending distinctly before tip, the hind cross vein 

 straight and joining fourth vein at last fourth of distance from small 

 cross vein to bend. 



I am unable to find a genus in the national collection with which 

 this is closely related. 



Genotype. — Piriona fasciculata^ new species. 



PIRIONA FASCICULATA, new species 



Male. — Black, palpi at lea!-.t basally and the tip of the second an- 

 tennal joint reddish yelloAv. Front wide, 0.29 of head width on 

 upper third, widening gradually ; frontals 8, decussate, none reclinate, 

 the first anterior to the ocellar triangle; frontal stripe wide, black; 

 parafacials and paraf rentals black, subshining; beard black. Thorax 

 black, shining, with traces of white pollen at front edge only. 

 Chaetotaxy: acrostichal 2, 2 (hindmost large and rather far before 



