54 



UNITED STATES NATIONAL MUSEUM BULLETIN 2 63 



long as inner |)Osteri()r supni-alars; niPso[)leurals 2, 

 pteropleural bristle longer tiian nieso])leurals and 

 directed posteriorly, sternnplcuial one, directed dorsally 

 and stronger than inesoi)leurals. 



Abdomen (pi. 20, fig. 7) distinctly shdrlcr lliaii head 

 and thorax combined, slender, nearly as wide as Ihorax, 

 less than twice as long as wide, gradually nariowed 

 toward the round apex, reddish yellow, obscured by 

 yellowish-grey tonicntuni and l)rii\\nisli de|)ressed 

 |iubescence, but margiiud setae erect and black; second 

 tergum slightly shoilei' tluui fifth, lateral l)()rders witli 

 many black long erect soinewliat l)iislly hairs; flCih 

 tergiun with a deep black narrow posterior marginal 

 band having many long l)lack erect bristly hairs on 

 apical ludf; genitalia cons]iicuous, castaneous, with 

 posterior half deep black, yellowish dorsal appentlages 

 long and broad, ventral appendages castaneous and 

 spinelike. 



Wing (i)l. 20, fig. 1) nearly as long as body, 2.3 

 times as long as wide; costal vein distinctly reaching 

 to end of m, costal spine distinctly sliorter than basal 

 l)ristle; Ri moderately curved toward costa, forming 

 a sharjjlj' [)ointed pterostigma; R2+3 not undulate, 

 nearly straight; R44.5 distinctly curved in ai)ical section, 

 ))arallel witii m, densely bristled from base to before 

 middle of apical section; r-m distinctly' beyond middle 

 of iMo, straight and perpendicular; m-cu straight, not 

 parallel with r-m, less than twice as long as latter; 

 ptcidstigma a little shorter than second costal cell; 

 anal cell shorter than basal cell, but witli a long sharp- 

 pointed inferior prolongation. Hyaline, with a light 

 yellow broad costal band from entire base to u])per 

 lialf of apex of R-,, occupying basal cell and almost 

 all of R3, but witii three costal indentations in R,, 

 of which the first at tip of R, is very large with round 

 ])osterior margin extending just below the middle of 

 Ri second in middle of ajjcx of R, (piadrate anil 

 smallest, and third cm apex of R,; costal band brownish 

 on costal border of ])terostigma, whicii is the i)ortion 

 between costal iiulentations and apical portion; three 

 I'adiate bands almost entirely brown, the first fnnn 

 r-m to apical half of anal vein, oblifpieh' straiglit, 

 second from base of m-cu to wing margin, then bent 

 along margin toward a point beyond middle of nuiuth 

 of Cu, this ray not connected with costal band, tliird 

 (subapical band) from proximad of middle of apical 

 .section of R4+5 to near a])ex of 2M.,, straight and dis- 

 tinctly narrowed toward its base. Halteres oiange 

 yellow, comparatively small, but with long stalk. 



Legs moderate in length, light yellow, covered with 

 a brownish minute ])ubescence. Foreleg (pi. 20, fig. 10) 

 shortest; femur longer than tibia, with 0-8 long black 

 bristly hairs along externoventral margin, and 12-14 



shorter black bristly hairs on dorsal surface; tibia 

 nearly as long as tarsus, setae along two ventral mar- 

 gins stronger and darker than others; first tarsal 

 segnuMit distinctly shorter than the four following 

 segments together, brusidike bristles on internoventral 

 surface brown and weak. Alidleg (pi. 20, fig. 11) longer 

 than hindleg; femur as long as tibia, pubescence on 

 external surface darker and longer than on internal 

 surface, distinctly longer on ventral nnirgins, more 

 or less bristly on the apical venter; tibia consjjicuously 

 longer than tarsus, ajiical spur black and long but 

 w eak, at apex in addition many bixmnish short bristles, 

 of which two or three are black; first tarsal segment 

 as long as the four following segments tt)gether, brush- 

 like bristles on internoventral surface as on foreleg, 

 second to fiftii segments with two rows of black sluirt 

 spinelike bristles on venter. Hindleg (pi. 20, fig. 12): 

 femur distinctly longer than tibia, apical one-third of 

 dorsal siu'face with many long black bristly hairs, 

 eacli of the two ventral margins with a row of many 

 black short bristly hairs; tibiae more or less broadened 

 at middle third, where there is cme row of 7-9 black 

 short bristly hairs on external surface; tarsi conspicu- 

 ously shorter tlian tibia, segments graduallj- shortened 

 ajiically, first segment shorter than half as long as 

 tibia, longer than the four following segments together, 

 bristled as in midleg. 



Length: Body 8-8.2 mm, wing 7-8 nun. 



Typks.— Holotvpe, cf, USNM 69377; paratypes, 

 .3d^ (BMHandNIAS). 



Genus Puralrirliilltrmii Sliiraki 



Piiralrirliilhrinii .Shiraki, 19.'5:j, p. lo7. 



Paratrirliilhriiin aiit<iitii<>sliiiti<n'iisis, new species 



Plate 21 



A small to medium-sized, shining iilaik si)ecies, 

 aliietl to F. nitobrl Shiraki, but distinguished by two 

 inferior fronto-orbital liiistles aiul the comparatively 

 long thii'd aniennal segment. 



Male. — Heatl as broad as thorax, narrower than 

 twice the length, 1.3 times as high as long. Frons 

 (pi. 21, fig. 2) dirty yellow, with a broad brownish 

 to blackish-l)row II median Iransvei'se l)and just above 

 middle, dislinrtly iiroatler than one eye, slightly 

 widened apicaliy, with straiglit lateral margins; ver- 

 tical calli rather large and distinct, attaining middle 

 of frons and directed somewhat inward: hmule \ery 

 .small, distinctly sunken, l)i'owiiish, \ipp<>r portion willi 

 an ill-defined brown to blackisli-brow u transverse baml; 

 occllar triangle comparatively small, l)lack. Face (pi. 21, 



